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Diffstat (limited to 'ext/gd/libgd/gd_topal.c')
| -rw-r--r-- | ext/gd/libgd/gd_topal.c | 2122 |
1 files changed, 0 insertions, 2122 deletions
diff --git a/ext/gd/libgd/gd_topal.c b/ext/gd/libgd/gd_topal.c deleted file mode 100644 index 15eed3e11e..0000000000 --- a/ext/gd/libgd/gd_topal.c +++ /dev/null @@ -1,2122 +0,0 @@ -/* TODO: oim and nim in the lower level functions; - correct use of stub (sigh). */ - -/* 2.0.12: a new adaptation from the same original, this time - by Barend Gehrels. My attempt to incorporate alpha channel - into the result worked poorly and degraded the quality of - palette conversion even when the source contained no - alpha channel data. This version does not attempt to produce - an output file with transparency in some of the palette - indexes, which, in practice, doesn't look so hot anyway. TBB */ - -/* - * gd_topal, adapted from jquant2.c - * - * Copyright (C) 1991-1996, Thomas G. Lane. - * This file is part of the Independent JPEG Group's software. - * For conditions of distribution and use, see the accompanying README file. - * - * This file contains 2-pass color quantization (color mapping) routines. - * These routines provide selection of a custom color map for an image, - * followed by mapping of the image to that color map, with optional - * Floyd-Steinberg dithering. - * It is also possible to use just the second pass to map to an arbitrary - * externally-given color map. - * - * Note: ordered dithering is not supported, since there isn't any fast - * way to compute intercolor distances; it's unclear that ordered dither's - * fundamental assumptions even hold with an irregularly spaced color map. - */ - -#ifdef ORIGINAL_LIB_JPEG - -#define JPEG_INTERNALS - -#include "jinclude.h" -#include "jpeglib.h" - -#else - -/* - * THOMAS BOUTELL & BAREND GEHRELS, february 2003 - * adapted the code to work within gd rather than within libjpeg. - * If it is not working, it's not Thomas G. Lane's fault. - */ - -/* - SETTING THIS ONE CAUSES STRIPED IMAGE - to be done: solve this - #define ORIGINAL_LIB_JPEG_REVERSE_ODD_ROWS - */ - -#include <string.h> -#include "gd.h" -#include "gdhelpers.h" - -/* (Re)define some defines known by libjpeg */ -#define QUANT_2PASS_SUPPORTED - -#define RGB_RED 0 -#define RGB_GREEN 1 -#define RGB_BLUE 2 - -#define JSAMPLE unsigned char -#define MAXJSAMPLE (gdMaxColors-1) -#define BITS_IN_JSAMPLE 8 - -#define JSAMPROW int* -#define JDIMENSION int - -#define METHODDEF(type) static type -#define LOCAL(type) static type - - -/* We assume that right shift corresponds to signed division by 2 with - * rounding towards minus infinity. This is correct for typical "arithmetic - * shift" instructions that shift in copies of the sign bit. But some - * C compilers implement >> with an unsigned shift. For these machines you - * must define RIGHT_SHIFT_IS_UNSIGNED. - * RIGHT_SHIFT provides a proper signed right shift of an INT32 quantity. - * It is only applied with constant shift counts. SHIFT_TEMPS must be - * included in the variables of any routine using RIGHT_SHIFT. - */ - -#ifdef RIGHT_SHIFT_IS_UNSIGNED -#define SHIFT_TEMPS INT32 shift_temp; -#define RIGHT_SHIFT(x,shft) \ - ((shift_temp = (x)) < 0 ? \ - (shift_temp >> (shft)) | ((~((INT32) 0)) << (32-(shft))) : \ - (shift_temp >> (shft))) -#else -#define SHIFT_TEMPS -#define RIGHT_SHIFT(x,shft) ((x) >> (shft)) -#endif - - -#define range_limit(x) { if(x<0) x=0; if (x>255) x=255; } - - -#ifndef INT16 -#define INT16 short -#endif - -#ifndef UINT16 -#define UINT16 unsigned short -#endif - -#ifndef INT32 -#define INT32 int -#endif - -#ifndef FAR -#define FAR -#endif - - - -#ifndef boolean -#define boolean int -#endif - -#ifndef TRUE -#define TRUE 1 -#endif - -#ifndef FALSE -#define FALSE 0 -#endif - - -#define input_buf (oim->tpixels) -#define output_buf (nim->pixels) - -#endif - -#ifdef QUANT_2PASS_SUPPORTED - - -/* - * This module implements the well-known Heckbert paradigm for color - * quantization. Most of the ideas used here can be traced back to - * Heckbert's seminal paper - * Heckbert, Paul. "Color Image Quantization for Frame Buffer Display", - * Proc. SIGGRAPH '82, Computer Graphics v.16 #3 (July 1982), pp 297-304. - * - * In the first pass over the image, we accumulate a histogram showing the - * usage count of each possible color. To keep the histogram to a reasonable - * size, we reduce the precision of the input; typical practice is to retain - * 5 or 6 bits per color, so that 8 or 4 different input values are counted - * in the same histogram cell. - * - * Next, the color-selection step begins with a box representing the whole - * color space, and repeatedly splits the "largest" remaining box until we - * have as many boxes as desired colors. Then the mean color in each - * remaining box becomes one of the possible output colors. - * - * The second pass over the image maps each input pixel to the closest output - * color (optionally after applying a Floyd-Steinberg dithering correction). - * This mapping is logically trivial, but making it go fast enough requires - * considerable care. - * - * Heckbert-style quantizers vary a good deal in their policies for choosing - * the "largest" box and deciding where to cut it. The particular policies - * used here have proved out well in experimental comparisons, but better ones - * may yet be found. - * - * In earlier versions of the IJG code, this module quantized in YCbCr color - * space, processing the raw upsampled data without a color conversion step. - * This allowed the color conversion math to be done only once per colormap - * entry, not once per pixel. However, that optimization precluded other - * useful optimizations (such as merging color conversion with upsampling) - * and it also interfered with desired capabilities such as quantizing to an - * externally-supplied colormap. We have therefore abandoned that approach. - * The present code works in the post-conversion color space, typically RGB. - * - * To improve the visual quality of the results, we actually work in scaled - * RGB space, giving G distances more weight than R, and R in turn more than - * B. To do everything in integer math, we must use integer scale factors. - * The 2/3/1 scale factors used here correspond loosely to the relative - * weights of the colors in the NTSC grayscale equation. - * If you want to use this code to quantize a non-RGB color space, you'll - * probably need to change these scale factors. - */ - -#define R_SCALE 2 /* scale R distances by this much */ -#define G_SCALE 3 /* scale G distances by this much */ -#define B_SCALE 1 /* and B by this much */ - -/* Relabel R/G/B as components 0/1/2, respecting the RGB ordering defined - * in jmorecfg.h. As the code stands, it will do the right thing for R,G,B - * and B,G,R orders. If you define some other weird order in jmorecfg.h, - * you'll get compile errors until you extend this logic. In that case - * you'll probably want to tweak the histogram sizes too. - */ - -#if RGB_RED == 0 -#define C0_SCALE R_SCALE -#endif -#if RGB_BLUE == 0 -#define C0_SCALE B_SCALE -#endif -#if RGB_GREEN == 1 -#define C1_SCALE G_SCALE -#endif -#if RGB_RED == 2 -#define C2_SCALE R_SCALE -#endif -#if RGB_BLUE == 2 -#define C2_SCALE B_SCALE -#endif - - -/* - * First we have the histogram data structure and routines for creating it. - * - * The number of bits of precision can be adjusted by changing these symbols. - * We recommend keeping 6 bits for G and 5 each for R and B. - * If you have plenty of memory and cycles, 6 bits all around gives marginally - * better results; if you are short of memory, 5 bits all around will save - * some space but degrade the results. - * To maintain a fully accurate histogram, we'd need to allocate a "long" - * (preferably unsigned long) for each cell. In practice this is overkill; - * we can get by with 16 bits per cell. Few of the cell counts will overflow, - * and clamping those that do overflow to the maximum value will give close- - * enough results. This reduces the recommended histogram size from 256Kb - * to 128Kb, which is a useful savings on PC-class machines. - * (In the second pass the histogram space is re-used for pixel mapping data; - * in that capacity, each cell must be able to store zero to the number of - * desired colors. 16 bits/cell is plenty for that too.) - * Since the JPEG code is intended to run in small memory model on 80x86 - * machines, we can't just allocate the histogram in one chunk. Instead - * of a true 3-D array, we use a row of pointers to 2-D arrays. Each - * pointer corresponds to a C0 value (typically 2^5 = 32 pointers) and - * each 2-D array has 2^6*2^5 = 2048 or 2^6*2^6 = 4096 entries. Note that - * on 80x86 machines, the pointer row is in near memory but the actual - * arrays are in far memory (same arrangement as we use for image arrays). - */ - -#define MAXNUMCOLORS (MAXJSAMPLE+1) /* maximum size of colormap */ - -/* These will do the right thing for either R,G,B or B,G,R color order, - * but you may not like the results for other color orders. - */ -#define HIST_C0_BITS 5 /* bits of precision in R/B histogram */ -#define HIST_C1_BITS 6 /* bits of precision in G histogram */ -#define HIST_C2_BITS 5 /* bits of precision in B/R histogram */ - -/* Number of elements along histogram axes. */ -#define HIST_C0_ELEMS (1<<HIST_C0_BITS) -#define HIST_C1_ELEMS (1<<HIST_C1_BITS) -#define HIST_C2_ELEMS (1<<HIST_C2_BITS) - -/* These are the amounts to shift an input value to get a histogram index. */ -#define C0_SHIFT (BITS_IN_JSAMPLE-HIST_C0_BITS) -#define C1_SHIFT (BITS_IN_JSAMPLE-HIST_C1_BITS) -#define C2_SHIFT (BITS_IN_JSAMPLE-HIST_C2_BITS) - - -typedef UINT16 histcell; /* histogram cell; prefer an unsigned type */ - -typedef histcell FAR *histptr; /* for pointers to histogram cells */ - -typedef histcell hist1d[HIST_C2_ELEMS]; /* typedefs for the array */ -typedef hist1d FAR *hist2d; /* type for the 2nd-level pointers */ -typedef hist2d *hist3d; /* type for top-level pointer */ - - -/* Declarations for Floyd-Steinberg dithering. - * - * Errors are accumulated into the array fserrors[], at a resolution of - * 1/16th of a pixel count. The error at a given pixel is propagated - * to its not-yet-processed neighbors using the standard F-S fractions, - * ... (here) 7/16 - * 3/16 5/16 1/16 - * We work left-to-right on even rows, right-to-left on odd rows. - * - * We can get away with a single array (holding one row's worth of errors) - * by using it to store the current row's errors at pixel columns not yet - * processed, but the next row's errors at columns already processed. We - * need only a few extra variables to hold the errors immediately around the - * current column. (If we are lucky, those variables are in registers, but - * even if not, they're probably cheaper to access than array elements are.) - * - * The fserrors[] array has (#columns + 2) entries; the extra entry at - * each end saves us from special-casing the first and last pixels. - * Each entry is three values long, one value for each color component. - * - * Note: on a wide image, we might not have enough room in a PC's near data - * segment to hold the error array; so it is allocated with alloc_large. - */ - -#if BITS_IN_JSAMPLE == 8 -typedef INT16 FSERROR; /* 16 bits should be enough */ -typedef int LOCFSERROR; /* use 'int' for calculation temps */ -#else -typedef INT32 FSERROR; /* may need more than 16 bits */ -typedef INT32 LOCFSERROR; /* be sure calculation temps are big enough */ -#endif - -typedef FSERROR FAR *FSERRPTR; /* pointer to error array (in FAR storage!) */ - - -/* Private subobject */ - -typedef struct -{ -#ifdef ORIGINAL_LIB_JPEG - struct jpeg_color_quantizer pub; /* public fields */ - - /* Space for the eventually created colormap is stashed here */ - JSAMPARRAY sv_colormap; /* colormap allocated at init time */ - int desired; /* desired # of colors = size of colormap */ - boolean needs_zeroed; /* TRUE if next pass must zero histogram */ -#endif - - /* Variables for accumulating image statistics */ - hist3d histogram; /* pointer to the histogram */ - - - /* Variables for Floyd-Steinberg dithering */ - FSERRPTR fserrors; /* accumulated errors */ - - boolean on_odd_row; /* flag to remember which row we are on */ - int *error_limiter; /* table for clamping the applied error */ -#ifndef ORIGINAL_LIB_JPEG - int *error_limiter_storage; /* gdMalloc'd storage for the above */ -#endif -} -my_cquantizer; - -typedef my_cquantizer *my_cquantize_ptr; - - -/* - * Prescan some rows of pixels. - * In this module the prescan simply updates the histogram, which has been - * initialized to zeroes by start_pass. - * An output_buf parameter is required by the method signature, but no data - * is actually output (in fact the buffer controller is probably passing a - * NULL pointer). - */ - -METHODDEF (void) -#ifndef ORIGINAL_LIB_JPEG -prescan_quantize (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize) -{ -#else -prescan_quantize (j_decompress_ptr cinfo, JSAMPARRAY input_buf, - JSAMPARRAY output_buf, int num_rows) -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; -#endif - register JSAMPROW ptr; - register histptr histp; - register hist3d histogram = cquantize->histogram; - int row; - JDIMENSION col; -#ifdef ORIGINAL_LIB_JPEG - JDIMENSION width = cinfo->output_width; -#else - int width = oim->sx; - int num_rows = oim->sy; -#endif - - for (row = 0; row < num_rows; row++) - { - ptr = input_buf[row]; - for (col = width; col > 0; col--) - { -#ifdef ORIGINAL_LIB_JPEG - int r = GETJSAMPLE (ptr[0]) >> C0_SHIFT; - int g = GETJSAMPLE (ptr[1]) >> C1_SHIFT; - int b = GETJSAMPLE (ptr[2]) >> C2_SHIFT; -#else - int r = gdTrueColorGetRed (*ptr) >> C0_SHIFT; - int g = gdTrueColorGetGreen (*ptr) >> C1_SHIFT; - int b = gdTrueColorGetBlue (*ptr) >> C2_SHIFT; - /* 2.0.12: Steven Brown: support a single totally transparent - color in the original. */ - if ((oim->transparent >= 0) && (*ptr == oim->transparent)) - { - ptr++; - continue; - } -#endif - /* get pixel value and index into the histogram */ - histp = &histogram[r][g][b]; - /* increment, check for overflow and undo increment if so. */ - if (++(*histp) == 0) - (*histp)--; -#ifdef ORIGINAL_LIB_JPEG - ptr += 3; -#else - ptr++; -#endif - } - } -} - - -/* - * Next we have the really interesting routines: selection of a colormap - * given the completed histogram. - * These routines work with a list of "boxes", each representing a rectangular - * subset of the input color space (to histogram precision). - */ - -typedef struct -{ - /* The bounds of the box (inclusive); expressed as histogram indexes */ - int c0min, c0max; - int c1min, c1max; - int c2min, c2max; - /* The volume (actually 2-norm) of the box */ - INT32 volume; - /* The number of nonzero histogram cells within this box */ - long colorcount; -} -box; - -typedef box *boxptr; - - -LOCAL (boxptr) find_biggest_color_pop (boxptr boxlist, int numboxes) -/* Find the splittable box with the largest color population */ -/* Returns NULL if no splittable boxes remain */ -{ - register boxptr boxp; - register int i; - register long maxc = 0; - boxptr which = NULL; - - for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) - { - if (boxp->colorcount > maxc && boxp->volume > 0) - { - which = boxp; - maxc = boxp->colorcount; - } - } - return which; -} - - -LOCAL (boxptr) find_biggest_volume (boxptr boxlist, int numboxes) -/* Find the splittable box with the largest (scaled) volume */ -/* Returns NULL if no splittable boxes remain */ -{ - register boxptr boxp; - register int i; - register INT32 maxv = 0; - boxptr which = NULL; - - for (i = 0, boxp = boxlist; i < numboxes; i++, boxp++) - { - if (boxp->volume > maxv) - { - which = boxp; - maxv = boxp->volume; - } - } - return which; -} - - -LOCAL (void) -#ifndef ORIGINAL_LIB_JPEG - update_box (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, boxptr boxp) -{ -#else - update_box (j_decompress_ptr cinfo, boxptr boxp) -/* Shrink the min/max bounds of a box to enclose only nonzero elements, */ -/* and recompute its volume and population */ -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; -#endif - hist3d histogram = cquantize->histogram; - histptr histp; - int c0, c1, c2; - int c0min, c0max, c1min, c1max, c2min, c2max; - INT32 dist0, dist1, dist2; - long ccount; - - c0min = boxp->c0min; - c0max = boxp->c0max; - c1min = boxp->c1min; - c1max = boxp->c1max; - c2min = boxp->c2min; - c2max = boxp->c2max; - - if (c0max > c0min) - for (c0 = c0min; c0 <= c0max; c0++) - for (c1 = c1min; c1 <= c1max; c1++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++) - if (*histp++ != 0) - { - boxp->c0min = c0min = c0; - goto have_c0min; - } - } -have_c0min: - if (c0max > c0min) - for (c0 = c0max; c0 >= c0min; c0--) - for (c1 = c1min; c1 <= c1max; c1++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++) - if (*histp++ != 0) - { - boxp->c0max = c0max = c0; - goto have_c0max; - } - } -have_c0max: - if (c1max > c1min) - for (c1 = c1min; c1 <= c1max; c1++) - for (c0 = c0min; c0 <= c0max; c0++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++) - if (*histp++ != 0) - { - boxp->c1min = c1min = c1; - goto have_c1min; - } - } -have_c1min: - if (c1max > c1min) - for (c1 = c1max; c1 >= c1min; c1--) - for (c0 = c0min; c0 <= c0max; c0++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++) - if (*histp++ != 0) - { - boxp->c1max = c1max = c1; - goto have_c1max; - } - } -have_c1max: - if (c2max > c2min) - for (c2 = c2min; c2 <= c2max; c2++) - for (c0 = c0min; c0 <= c0max; c0++) - { - histp = &histogram[c0][c1min][c2]; - for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS) - if (*histp != 0) - { - boxp->c2min = c2min = c2; - goto have_c2min; - } - } -have_c2min: - if (c2max > c2min) - for (c2 = c2max; c2 >= c2min; c2--) - for (c0 = c0min; c0 <= c0max; c0++) - { - histp = &histogram[c0][c1min][c2]; - for (c1 = c1min; c1 <= c1max; c1++, histp += HIST_C2_ELEMS) - if (*histp != 0) - { - boxp->c2max = c2max = c2; - goto have_c2max; - } - } -have_c2max: - - /* Update box volume. - * We use 2-norm rather than real volume here; this biases the method - * against making long narrow boxes, and it has the side benefit that - * a box is splittable iff norm > 0. - * Since the differences are expressed in histogram-cell units, - * we have to shift back to JSAMPLE units to get consistent distances; - * after which, we scale according to the selected distance scale factors. - */ - dist0 = ((c0max - c0min) << C0_SHIFT) * C0_SCALE; - dist1 = ((c1max - c1min) << C1_SHIFT) * C1_SCALE; - dist2 = ((c2max - c2min) << C2_SHIFT) * C2_SCALE; - boxp->volume = dist0 * dist0 + dist1 * dist1 + dist2 * dist2; - - /* Now scan remaining volume of box and compute population */ - ccount = 0; - for (c0 = c0min; c0 <= c0max; c0++) - for (c1 = c1min; c1 <= c1max; c1++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++, histp++) - if (*histp != 0) - { - ccount++; - } - } - boxp->colorcount = ccount; -} - - -LOCAL (int) -#ifdef ORIGINAL_LIB_JPEG -median_cut (j_decompress_ptr cinfo, boxptr boxlist, int numboxes, - int desired_colors) -#else -median_cut (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, - boxptr boxlist, int numboxes, int desired_colors) -#endif -/* Repeatedly select and split the largest box until we have enough boxes */ -{ - int n, lb; - int c0, c1, c2, cmax; - register boxptr b1, b2; - - while (numboxes < desired_colors) - { - /* Select box to split. - * Current algorithm: by population for first half, then by volume. - */ - if (numboxes * 2 <= desired_colors) - { - b1 = find_biggest_color_pop (boxlist, numboxes); - } - else - { - b1 = find_biggest_volume (boxlist, numboxes); - } - if (b1 == NULL) /* no splittable boxes left! */ - break; - b2 = &boxlist[numboxes]; /* where new box will go */ - /* Copy the color bounds to the new box. */ - b2->c0max = b1->c0max; - b2->c1max = b1->c1max; - b2->c2max = b1->c2max; - b2->c0min = b1->c0min; - b2->c1min = b1->c1min; - b2->c2min = b1->c2min; - /* Choose which axis to split the box on. - * Current algorithm: longest scaled axis. - * See notes in update_box about scaling distances. - */ - c0 = ((b1->c0max - b1->c0min) << C0_SHIFT) * C0_SCALE; - c1 = ((b1->c1max - b1->c1min) << C1_SHIFT) * C1_SCALE; - c2 = ((b1->c2max - b1->c2min) << C2_SHIFT) * C2_SCALE; - /* We want to break any ties in favor of green, then red, blue last. - * This code does the right thing for R,G,B or B,G,R color orders only. - */ -#if RGB_RED == 0 - cmax = c1; - n = 1; - if (c0 > cmax) - { - cmax = c0; - n = 0; - } - if (c2 > cmax) - { - n = 2; - } -#else - cmax = c1; - n = 1; - if (c2 > cmax) - { - cmax = c2; - n = 2; - } - if (c0 > cmax) - { - n = 0; - } -#endif - /* Choose split point along selected axis, and update box bounds. - * Current algorithm: split at halfway point. - * (Since the box has been shrunk to minimum volume, - * any split will produce two nonempty subboxes.) - * Note that lb value is max for lower box, so must be < old max. - */ - switch (n) - { - case 0: - lb = (b1->c0max + b1->c0min) / 2; - b1->c0max = lb; - b2->c0min = lb + 1; - break; - case 1: - lb = (b1->c1max + b1->c1min) / 2; - b1->c1max = lb; - b2->c1min = lb + 1; - break; - case 2: - lb = (b1->c2max + b1->c2min) / 2; - b1->c2max = lb; - b2->c2min = lb + 1; - break; - } - /* Update stats for boxes */ -#ifdef ORIGINAL_LIB_JPEG - update_box (cinfo, b1); - update_box (cinfo, b2); -#else - update_box (oim, nim, cquantize, b1); - update_box (oim, nim, cquantize, b2); -#endif - numboxes++; - } - return numboxes; -} - - -LOCAL (void) -#ifndef ORIGINAL_LIB_JPEG - compute_color (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, - boxptr boxp, int icolor) -{ -#else - compute_color (j_decompress_ptr cinfo, boxptr boxp, int icolor) -/* Compute representative color for a box, put it in colormap[icolor] */ -{ - /* Current algorithm: mean weighted by pixels (not colors) */ - /* Note it is important to get the rounding correct! */ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; -#endif - hist3d histogram = cquantize->histogram; - histptr histp; - int c0, c1, c2; - int c0min, c0max, c1min, c1max, c2min, c2max; - long count = 0; /* 2.0.28: = 0 */ - long total = 0; - long c0total = 0; - long c1total = 0; - long c2total = 0; - - c0min = boxp->c0min; - c0max = boxp->c0max; - c1min = boxp->c1min; - c1max = boxp->c1max; - c2min = boxp->c2min; - c2max = boxp->c2max; - - for (c0 = c0min; c0 <= c0max; c0++) - for (c1 = c1min; c1 <= c1max; c1++) - { - histp = &histogram[c0][c1][c2min]; - for (c2 = c2min; c2 <= c2max; c2++) - { - if ((count = *histp++) != 0) - { - total += count; - c0total += - ((c0 << C0_SHIFT) + ((1 << C0_SHIFT) >> 1)) * count; - c1total += - ((c1 << C1_SHIFT) + ((1 << C1_SHIFT) >> 1)) * count; - c2total += - ((c2 << C2_SHIFT) + ((1 << C2_SHIFT) >> 1)) * count; - } - } - } - -#ifdef ORIGINAL_LIB_JPEG - cinfo->colormap[0][icolor] = (JSAMPLE) ((c0total + (total >> 1)) / total); - cinfo->colormap[1][icolor] = (JSAMPLE) ((c1total + (total >> 1)) / total); - cinfo->colormap[2][icolor] = (JSAMPLE) ((c2total + (total >> 1)) / total); -#else - /* 2.0.16: Paul den Dulk found an occasion where total can be 0 */ - if (count) - { - nim->red[icolor] = (int) ((c0total + (total >> 1)) / total); - nim->green[icolor] = (int) ((c1total + (total >> 1)) / total); - nim->blue[icolor] = (int) ((c2total + (total >> 1)) / total); - } - else - { - nim->red[icolor] = 255; - nim->green[icolor] = 255; - nim->blue[icolor] = 255; - } -#endif -} - - -LOCAL (void) -#ifdef ORIGINAL_LIB_JPEG -select_colors (j_decompress_ptr cinfo, int desired_colors) -#else -select_colors (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, int desired_colors) -#endif -/* Master routine for color selection */ -{ - boxptr boxlist; - int numboxes; - int i; - - /* Allocate workspace for box list */ -#ifdef ORIGINAL_LIB_JPEG - boxlist = (boxptr) (*cinfo->mem->alloc_small) - ((j_common_ptr) cinfo, JPOOL_IMAGE, desired_colors * SIZEOF (box)); -#else - boxlist = (boxptr) safe_emalloc(desired_colors, sizeof (box), 1); -#endif - /* Initialize one box containing whole space */ - numboxes = 1; - boxlist[0].c0min = 0; - boxlist[0].c0max = MAXJSAMPLE >> C0_SHIFT; - boxlist[0].c1min = 0; - boxlist[0].c1max = MAXJSAMPLE >> C1_SHIFT; - boxlist[0].c2min = 0; - boxlist[0].c2max = MAXJSAMPLE >> C2_SHIFT; -#ifdef ORIGINAL_LIB_JPEG - /* Shrink it to actually-used volume and set its statistics */ - update_box (cinfo, &boxlist[0]); - /* Perform median-cut to produce final box list */ - numboxes = median_cut (cinfo, boxlist, numboxes, desired_colors); - /* Compute the representative color for each box, fill colormap */ - for (i = 0; i < numboxes; i++) - compute_color (cinfo, &boxlist[i], i); - cinfo->actual_number_of_colors = numboxes; - TRACEMS1 (cinfo, 1, JTRC_QUANT_SELECTED, numboxes); -#else - /* Shrink it to actually-used volume and set its statistics */ - update_box (oim, nim, cquantize, &boxlist[0]); - /* Perform median-cut to produce final box list */ - numboxes = median_cut (oim, nim, cquantize, boxlist, numboxes, desired_colors); - /* Compute the representative color for each box, fill colormap */ - for (i = 0; i < numboxes; i++) - compute_color (oim, nim, cquantize, &boxlist[i], i); - nim->colorsTotal = numboxes; - - /* If we had a pure transparency color, add it as the last palette entry. - * Skip incrementing the color count so that the dither / matching phase - * won't use it on pixels that shouldn't have been transparent. We'll - * increment it after all that finishes. */ - if (oim->transparent >= 0) - { - /* Save the transparent color. */ - nim->red[nim->colorsTotal] = gdTrueColorGetRed (oim->transparent); - nim->green[nim->colorsTotal] = gdTrueColorGetGreen (oim->transparent); - nim->blue[nim->colorsTotal] = gdTrueColorGetBlue (oim->transparent); - nim->alpha[nim->colorsTotal] = gdAlphaTransparent; - nim->open[nim->colorsTotal] = 0; - } - - gdFree (boxlist); -#endif -} - - -/* - * These routines are concerned with the time-critical task of mapping input - * colors to the nearest color in the selected colormap. - * - * We re-use the histogram space as an "inverse color map", essentially a - * cache for the results of nearest-color searches. All colors within a - * histogram cell will be mapped to the same colormap entry, namely the one - * closest to the cell's center. This may not be quite the closest entry to - * the actual input color, but it's almost as good. A zero in the cache - * indicates we haven't found the nearest color for that cell yet; the array - * is cleared to zeroes before starting the mapping pass. When we find the - * nearest color for a cell, its colormap index plus one is recorded in the - * cache for future use. The pass2 scanning routines call fill_inverse_cmap - * when they need to use an unfilled entry in the cache. - * - * Our method of efficiently finding nearest colors is based on the "locally - * sorted search" idea described by Heckbert and on the incremental distance - * calculation described by Spencer W. Thomas in chapter III.1 of Graphics - * Gems II (James Arvo, ed. Academic Press, 1991). Thomas points out that - * the distances from a given colormap entry to each cell of the histogram can - * be computed quickly using an incremental method: the differences between - * distances to adjacent cells themselves differ by a constant. This allows a - * fairly fast implementation of the "brute force" approach of computing the - * distance from every colormap entry to every histogram cell. Unfortunately, - * it needs a work array to hold the best-distance-so-far for each histogram - * cell (because the inner loop has to be over cells, not colormap entries). - * The work array elements have to be INT32s, so the work array would need - * 256Kb at our recommended precision. This is not feasible in DOS machines. - * - * To get around these problems, we apply Thomas' method to compute the - * nearest colors for only the cells within a small subbox of the histogram. - * The work array need be only as big as the subbox, so the memory usage - * problem is solved. Furthermore, we need not fill subboxes that are never - * referenced in pass2; many images use only part of the color gamut, so a - * fair amount of work is saved. An additional advantage of this - * approach is that we can apply Heckbert's locality criterion to quickly - * eliminate colormap entries that are far away from the subbox; typically - * three-fourths of the colormap entries are rejected by Heckbert's criterion, - * and we need not compute their distances to individual cells in the subbox. - * The speed of this approach is heavily influenced by the subbox size: too - * small means too much overhead, too big loses because Heckbert's criterion - * can't eliminate as many colormap entries. Empirically the best subbox - * size seems to be about 1/512th of the histogram (1/8th in each direction). - * - * Thomas' article also describes a refined method which is asymptotically - * faster than the brute-force method, but it is also far more complex and - * cannot efficiently be applied to small subboxes. It is therefore not - * useful for programs intended to be portable to DOS machines. On machines - * with plenty of memory, filling the whole histogram in one shot with Thomas' - * refined method might be faster than the present code --- but then again, - * it might not be any faster, and it's certainly more complicated. - */ - - -/* log2(histogram cells in update box) for each axis; this can be adjusted */ -#define BOX_C0_LOG (HIST_C0_BITS-3) -#define BOX_C1_LOG (HIST_C1_BITS-3) -#define BOX_C2_LOG (HIST_C2_BITS-3) - -#define BOX_C0_ELEMS (1<<BOX_C0_LOG) /* # of hist cells in update box */ -#define BOX_C1_ELEMS (1<<BOX_C1_LOG) -#define BOX_C2_ELEMS (1<<BOX_C2_LOG) - -#define BOX_C0_SHIFT (C0_SHIFT + BOX_C0_LOG) -#define BOX_C1_SHIFT (C1_SHIFT + BOX_C1_LOG) -#define BOX_C2_SHIFT (C2_SHIFT + BOX_C2_LOG) - - -/* - * The next three routines implement inverse colormap filling. They could - * all be folded into one big routine, but splitting them up this way saves - * some stack space (the mindist[] and bestdist[] arrays need not coexist) - * and may allow some compilers to produce better code by registerizing more - * inner-loop variables. - */ - -LOCAL (int) -find_nearby_colors ( -#ifdef ORIGINAL_LIB_JPEG - j_decompress_ptr cinfo, -#else - gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, -#endif - int minc0, int minc1, int minc2, JSAMPLE colorlist[]) -/* Locate the colormap entries close enough to an update box to be candidates - * for the nearest entry to some cell(s) in the update box. The update box - * is specified by the center coordinates of its first cell. The number of - * candidate colormap entries is returned, and their colormap indexes are - * placed in colorlist[]. - * This routine uses Heckbert's "locally sorted search" criterion to select - * the colors that need further consideration. - */ -{ -#ifdef ORIGINAL_LIB_JPEG - int numcolors = cinfo->actual_number_of_colors; -#else - int numcolors = nim->colorsTotal; -#endif - int maxc0, maxc1, maxc2; - int centerc0, centerc1, centerc2; - int i, x, ncolors; - INT32 minmaxdist, min_dist, max_dist, tdist; - INT32 mindist[MAXNUMCOLORS]; /* min distance to colormap entry i */ - - /* Compute true coordinates of update box's upper corner and center. - * Actually we compute the coordinates of the center of the upper-corner - * histogram cell, which are the upper bounds of the volume we care about. - * Note that since ">>" rounds down, the "center" values may be closer to - * min than to max; hence comparisons to them must be "<=", not "<". - */ - maxc0 = minc0 + ((1 << BOX_C0_SHIFT) - (1 << C0_SHIFT)); - centerc0 = (minc0 + maxc0) >> 1; - maxc1 = minc1 + ((1 << BOX_C1_SHIFT) - (1 << C1_SHIFT)); - centerc1 = (minc1 + maxc1) >> 1; - maxc2 = minc2 + ((1 << BOX_C2_SHIFT) - (1 << C2_SHIFT)); - centerc2 = (minc2 + maxc2) >> 1; - - /* For each color in colormap, find: - * 1. its minimum squared-distance to any point in the update box - * (zero if color is within update box); - * 2. its maximum squared-distance to any point in the update box. - * Both of these can be found by considering only the corners of the box. - * We save the minimum distance for each color in mindist[]; - * only the smallest maximum distance is of interest. - */ - minmaxdist = 0x7FFFFFFFL; - - for (i = 0; i < numcolors; i++) - { - /* We compute the squared-c0-distance term, then add in the other two. */ -#ifdef ORIGINAL_LIB_JPEG - x = GETJSAMPLE (cinfo->colormap[0][i]); -#else - x = nim->red[i]; -#endif - if (x < minc0) - { - tdist = (x - minc0) * C0_SCALE; - min_dist = tdist * tdist; - tdist = (x - maxc0) * C0_SCALE; - max_dist = tdist * tdist; - } - else if (x > maxc0) - { - tdist = (x - maxc0) * C0_SCALE; - min_dist = tdist * tdist; - tdist = (x - minc0) * C0_SCALE; - max_dist = tdist * tdist; - } - else - { - /* within cell range so no contribution to min_dist */ - min_dist = 0; - if (x <= centerc0) - { - tdist = (x - maxc0) * C0_SCALE; - max_dist = tdist * tdist; - } - else - { - tdist = (x - minc0) * C0_SCALE; - max_dist = tdist * tdist; - } - } - -#ifdef ORIGINAL_LIB_JPEG - x = GETJSAMPLE (cinfo->colormap[1][i]); -#else - x = nim->green[i]; -#endif - if (x < minc1) - { - tdist = (x - minc1) * C1_SCALE; - min_dist += tdist * tdist; - tdist = (x - maxc1) * C1_SCALE; - max_dist += tdist * tdist; - } - else if (x > maxc1) - { - tdist = (x - maxc1) * C1_SCALE; - min_dist += tdist * tdist; - tdist = (x - minc1) * C1_SCALE; - max_dist += tdist * tdist; - } - else - { - /* within cell range so no contribution to min_dist */ - if (x <= centerc1) - { - tdist = (x - maxc1) * C1_SCALE; - max_dist += tdist * tdist; - } - else - { - tdist = (x - minc1) * C1_SCALE; - max_dist += tdist * tdist; - } - } - -#ifdef ORIGINAL_LIB_JPEG - x = GETJSAMPLE (cinfo->colormap[2][i]); -#else - x = nim->blue[i]; -#endif - if (x < minc2) - { - tdist = (x - minc2) * C2_SCALE; - min_dist += tdist * tdist; - tdist = (x - maxc2) * C2_SCALE; - max_dist += tdist * tdist; - } - else if (x > maxc2) - { - tdist = (x - maxc2) * C2_SCALE; - min_dist += tdist * tdist; - tdist = (x - minc2) * C2_SCALE; - max_dist += tdist * tdist; - } - else - { - /* within cell range so no contribution to min_dist */ - if (x <= centerc2) - { - tdist = (x - maxc2) * C2_SCALE; - max_dist += tdist * tdist; - } - else - { - tdist = (x - minc2) * C2_SCALE; - max_dist += tdist * tdist; - } - } - - mindist[i] = min_dist; /* save away the results */ - if (max_dist < minmaxdist) - minmaxdist = max_dist; - } - - /* Now we know that no cell in the update box is more than minmaxdist - * away from some colormap entry. Therefore, only colors that are - * within minmaxdist of some part of the box need be considered. - */ - ncolors = 0; - for (i = 0; i < numcolors; i++) - { - if (mindist[i] <= minmaxdist) - colorlist[ncolors++] = (JSAMPLE) i; - } - return ncolors; -} - - -LOCAL (void) find_best_colors ( -#ifdef ORIGINAL_LIB_JPEG - j_decompress_ptr cinfo, -#else - gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, -#endif - int minc0, int minc1, int minc2, - int numcolors, JSAMPLE colorlist[], - JSAMPLE bestcolor[]) -/* Find the closest colormap entry for each cell in the update box, - * given the list of candidate colors prepared by find_nearby_colors. - * Return the indexes of the closest entries in the bestcolor[] array. - * This routine uses Thomas' incremental distance calculation method to - * find the distance from a colormap entry to successive cells in the box. - */ -{ - int ic0, ic1, ic2; - int i, icolor; - register INT32 *bptr; /* pointer into bestdist[] array */ - JSAMPLE *cptr; /* pointer into bestcolor[] array */ - INT32 dist0, dist1; /* initial distance values */ - register INT32 dist2; /* current distance in inner loop */ - INT32 xx0, xx1; /* distance increments */ - register INT32 xx2; - INT32 inc0, inc1, inc2; /* initial values for increments */ - /* This array holds the distance to the nearest-so-far color for each cell */ - INT32 bestdist[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS]; - - /* Initialize best-distance for each cell of the update box */ - bptr = bestdist; - for (i = BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS - 1; i >= 0; i--) - *bptr++ = 0x7FFFFFFFL; - - /* For each color selected by find_nearby_colors, - * compute its distance to the center of each cell in the box. - * If that's less than best-so-far, update best distance and color number. - */ - - /* Nominal steps between cell centers ("x" in Thomas article) */ -#define STEP_C0 ((1 << C0_SHIFT) * C0_SCALE) -#define STEP_C1 ((1 << C1_SHIFT) * C1_SCALE) -#define STEP_C2 ((1 << C2_SHIFT) * C2_SCALE) - - for (i = 0; i < numcolors; i++) - { - int r, g, b; -#ifdef ORIGINAL_LIB_JPEG - - icolor = GETJSAMPLE (colorlist[i]); - r = GETJSAMPLE (cinfo->colormap[0][icolor]); - g = GETJSAMPLE (cinfo->colormap[1][icolor]); - b = GETJSAMPLE (cinfo->colormap[2][icolor]); -#else - icolor = colorlist[i]; - r = nim->red[icolor]; - g = nim->green[icolor]; - b = nim->blue[icolor]; -#endif - - /* Compute (square of) distance from minc0/c1/c2 to this color */ - inc0 = (minc0 - r) * C0_SCALE; - dist0 = inc0 * inc0; - inc1 = (minc1 - g) * C1_SCALE; - dist0 += inc1 * inc1; - inc2 = (minc2 - b) * C2_SCALE; - dist0 += inc2 * inc2; - /* Form the initial difference increments */ - inc0 = inc0 * (2 * STEP_C0) + STEP_C0 * STEP_C0; - inc1 = inc1 * (2 * STEP_C1) + STEP_C1 * STEP_C1; - inc2 = inc2 * (2 * STEP_C2) + STEP_C2 * STEP_C2; - /* Now loop over all cells in box, updating distance per Thomas method */ - bptr = bestdist; - cptr = bestcolor; - xx0 = inc0; - for (ic0 = BOX_C0_ELEMS - 1; ic0 >= 0; ic0--) - { - dist1 = dist0; - xx1 = inc1; - for (ic1 = BOX_C1_ELEMS - 1; ic1 >= 0; ic1--) - { - dist2 = dist1; - xx2 = inc2; - for (ic2 = BOX_C2_ELEMS - 1; ic2 >= 0; ic2--) - { - if (dist2 < *bptr) - { - *bptr = dist2; - *cptr = (JSAMPLE) icolor; - } - dist2 += xx2; - xx2 += 2 * STEP_C2 * STEP_C2; - bptr++; - cptr++; - } - dist1 += xx1; - xx1 += 2 * STEP_C1 * STEP_C1; - } - dist0 += xx0; - xx0 += 2 * STEP_C0 * STEP_C0; - } - } -} - - -LOCAL (void) -fill_inverse_cmap ( -#ifdef ORIGINAL_LIB_JPEG - j_decompress_ptr cinfo, -#else - gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize, -#endif - int c0, int c1, int c2) -/* Fill the inverse-colormap entries in the update box that contains */ -/* histogram cell c0/c1/c2. (Only that one cell MUST be filled, but */ -/* we can fill as many others as we wish.) */ -{ -#ifdef ORIGINAL_LIB_JPEG - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; -#endif - hist3d histogram = cquantize->histogram; - int minc0, minc1, minc2; /* lower left corner of update box */ - int ic0, ic1, ic2; - register JSAMPLE *cptr; /* pointer into bestcolor[] array */ - register histptr cachep; /* pointer into main cache array */ - /* This array lists the candidate colormap indexes. */ - JSAMPLE colorlist[MAXNUMCOLORS]; - int numcolors; /* number of candidate colors */ - /* This array holds the actually closest colormap index for each cell. */ - JSAMPLE bestcolor[BOX_C0_ELEMS * BOX_C1_ELEMS * BOX_C2_ELEMS]; - - /* Convert cell coordinates to update box ID */ - c0 >>= BOX_C0_LOG; - c1 >>= BOX_C1_LOG; - c2 >>= BOX_C2_LOG; - - /* Compute true coordinates of update box's origin corner. - * Actually we compute the coordinates of the center of the corner - * histogram cell, which are the lower bounds of the volume we care about. - */ - minc0 = (c0 << BOX_C0_SHIFT) + ((1 << C0_SHIFT) >> 1); - minc1 = (c1 << BOX_C1_SHIFT) + ((1 << C1_SHIFT) >> 1); - minc2 = (c2 << BOX_C2_SHIFT) + ((1 << C2_SHIFT) >> 1); - - /* Determine which colormap entries are close enough to be candidates - * for the nearest entry to some cell in the update box. - */ -#ifdef ORIGINAL_LIB_JPEG - numcolors = find_nearby_colors (cinfo, minc0, minc1, minc2, colorlist); - - /* Determine the actually nearest colors. */ - find_best_colors (cinfo, minc0, minc1, minc2, numcolors, colorlist, - bestcolor); -#else - numcolors = - find_nearby_colors (oim, nim, cquantize, minc0, minc1, minc2, colorlist); - find_best_colors (oim, nim, cquantize, minc0, minc1, minc2, numcolors, - colorlist, bestcolor); -#endif - - /* Save the best color numbers (plus 1) in the main cache array */ - c0 <<= BOX_C0_LOG; /* convert ID back to base cell indexes */ - c1 <<= BOX_C1_LOG; - c2 <<= BOX_C2_LOG; - cptr = bestcolor; - for (ic0 = 0; ic0 < BOX_C0_ELEMS; ic0++) - { - for (ic1 = 0; ic1 < BOX_C1_ELEMS; ic1++) - { - cachep = &histogram[c0 + ic0][c1 + ic1][c2]; - for (ic2 = 0; ic2 < BOX_C2_ELEMS; ic2++) - { -#ifdef ORIGINAL_LIB_JPEG - *cachep++ = (histcell) (GETJSAMPLE (*cptr++) + 1); -#else - *cachep++ = (histcell) ((*cptr++) + 1); -#endif - } - } - } -} - - -/* - * Map some rows of pixels to the output colormapped representation. - */ - -METHODDEF (void) -#ifndef ORIGINAL_LIB_JPEG -pass2_no_dither (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize) -{ - register int *inptr; - register unsigned char *outptr; - int width = oim->sx; - int num_rows = oim->sy; -#else -pass2_no_dither (j_decompress_ptr cinfo, - JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows) -/* This version performs no dithering */ -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - register JSAMPROW inptr, outptr; - JDIMENSION width = cinfo->output_width; -#endif - hist3d histogram = cquantize->histogram; - register int c0, c1, c2; - int row; - JDIMENSION col; - register histptr cachep; - - - for (row = 0; row < num_rows; row++) - { - inptr = input_buf[row]; - outptr = output_buf[row]; - for (col = width; col > 0; col--) - { - /* get pixel value and index into the cache */ - int r, g, b; -#ifdef ORIGINAL_LIB_JPEG - r = GETJSAMPLE (*inptr++); - g = GETJSAMPLE (*inptr++); - b = GETJSAMPLE (*inptr++); -#else - r = gdTrueColorGetRed (*inptr); - g = gdTrueColorGetGreen (*inptr); - /* - 2.0.24: inptr must not be incremented until after - transparency check, if any. Thanks to "Super Pikeman." - */ - b = gdTrueColorGetBlue (*inptr); - - /* If the pixel is transparent, we assign it the palette index that - * will later be added at the end of the palette as the transparent - * index. */ - if ((oim->transparent >= 0) && (oim->transparent == *(inptr - 1))) - { - *outptr++ = nim->colorsTotal; - inptr++; - continue; - } - inptr++; -#endif - c0 = r >> C0_SHIFT; - c1 = g >> C1_SHIFT; - c2 = b >> C2_SHIFT; - cachep = &histogram[c0][c1][c2]; - /* If we have not seen this color before, find nearest colormap entry */ - /* and update the cache */ - if (*cachep == 0) -#ifdef ORIGINAL_LIB_JPEG - fill_inverse_cmap (cinfo, c0, c1, c2); -#else - fill_inverse_cmap (oim, nim, cquantize, c0, c1, c2); -#endif - /* Now emit the colormap index for this cell */ -#ifdef ORIGINAL_LIB_JPEG - *outptr++ = (JSAMPLE) (*cachep - 1); -#else - *outptr++ = (*cachep - 1); -#endif - } - } -} - - -METHODDEF (void) -#ifndef ORIGINAL_LIB_JPEG -pass2_fs_dither (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize) -{ -#else -pass2_fs_dither (j_decompress_ptr cinfo, - JSAMPARRAY input_buf, JSAMPARRAY output_buf, int num_rows) -/* This version performs Floyd-Steinberg dithering */ -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - JSAMPROW inptr; /* => current input pixel */ -#endif - hist3d histogram = cquantize->histogram; - register LOCFSERROR cur0, cur1, cur2; /* current error or pixel value */ - LOCFSERROR belowerr0, belowerr1, belowerr2; /* error for pixel below cur */ - LOCFSERROR bpreverr0, bpreverr1, bpreverr2; /* error for below/prev col */ - register FSERRPTR errorptr; /* => fserrors[] at column before current */ - histptr cachep; - int dir; /* +1 or -1 depending on direction */ - int dir3; /* 3*dir, for advancing inptr & errorptr */ - int row; - JDIMENSION col; -#ifdef ORIGINAL_LIB_JPEG - JSAMPROW outptr; /* => current output pixel */ - JDIMENSION width = cinfo->output_width; - JSAMPLE *range_limit = cinfo->sample_range_limit; - JSAMPROW colormap0 = cinfo->colormap[0]; - JSAMPROW colormap1 = cinfo->colormap[1]; - JSAMPROW colormap2 = cinfo->colormap[2]; -#else - int *inptr; /* => current input pixel */ - unsigned char *outptr; /* => current output pixel */ - int width = oim->sx; - int num_rows = oim->sy; - int *colormap0 = nim->red; - int *colormap1 = nim->green; - int *colormap2 = nim->blue; -#endif - int *error_limit = cquantize->error_limiter; - - - SHIFT_TEMPS for (row = 0; row < num_rows; row++) - { - inptr = input_buf[row]; - outptr = output_buf[row]; - if (cquantize->on_odd_row) - { - /* work right to left in this row */ - inptr += (width - 1) * 3; /* so point to rightmost pixel */ - outptr += width - 1; - dir = -1; - dir3 = -3; - errorptr = cquantize->fserrors + (width + 1) * 3; /* => entry after last column */ -#ifdef ORIGINAL_LIB_JPEG_REVERSE_ODD_ROWS - cquantize->on_odd_row = FALSE; /* flip for next time */ -#endif - } - else - { - /* work left to right in this row */ - dir = 1; - dir3 = 3; - errorptr = cquantize->fserrors; /* => entry before first real column */ -#ifdef ORIGINAL_LIB_JPEG_REVERSE_ODD_ROWS - cquantize->on_odd_row = TRUE; /* flip for next time */ -#endif - } - /* Preset error values: no error propagated to first pixel from left */ - cur0 = cur1 = cur2 = 0; - /* and no error propagated to row below yet */ - belowerr0 = belowerr1 = belowerr2 = 0; - bpreverr0 = bpreverr1 = bpreverr2 = 0; - - for (col = width; col > 0; col--) - { - - /* If this pixel is transparent, we want to assign it to the special - * transparency color index past the end of the palette rather than - * go through matching / dithering. */ - if ((oim->transparent >= 0) && (*inptr == oim->transparent)) - { - *outptr = nim->colorsTotal; - errorptr[0] = 0; - errorptr[1] = 0; - errorptr[2] = 0; - errorptr[3] = 0; - inptr += dir; - outptr += dir; - errorptr += dir3; - continue; - } - /* curN holds the error propagated from the previous pixel on the - * current line. Add the error propagated from the previous line - * to form the complete error correction term for this pixel, and - * round the error term (which is expressed * 16) to an integer. - * RIGHT_SHIFT rounds towards minus infinity, so adding 8 is correct - * for either sign of the error value. - * Note: errorptr points to *previous* column's array entry. - */ - cur0 = RIGHT_SHIFT (cur0 + errorptr[dir3 + 0] + 8, 4); - cur1 = RIGHT_SHIFT (cur1 + errorptr[dir3 + 1] + 8, 4); - cur2 = RIGHT_SHIFT (cur2 + errorptr[dir3 + 2] + 8, 4); - /* Limit the error using transfer function set by init_error_limit. - * See comments with init_error_limit for rationale. - */ - cur0 = error_limit[cur0]; - cur1 = error_limit[cur1]; - cur2 = error_limit[cur2]; - /* Form pixel value + error, and range-limit to 0..MAXJSAMPLE. - * The maximum error is +- MAXJSAMPLE (or less with error limiting); - * this sets the required size of the range_limit array. - */ -#ifdef ORIGINAL_LIB_JPEG - cur0 += GETJSAMPLE (inptr[0]); - cur1 += GETJSAMPLE (inptr[1]); - cur2 += GETJSAMPLE (inptr[2]); - cur0 = GETJSAMPLE (range_limit[cur0]); - cur1 = GETJSAMPLE (range_limit[cur1]); - cur2 = GETJSAMPLE (range_limit[cur2]); -#else - cur0 += gdTrueColorGetRed (*inptr); - cur1 += gdTrueColorGetGreen (*inptr); - cur2 += gdTrueColorGetBlue (*inptr); - range_limit (cur0); - range_limit (cur1); - range_limit (cur2); -#endif - - /* Index into the cache with adjusted pixel value */ - cachep = - &histogram[cur0 >> C0_SHIFT][cur1 >> C1_SHIFT][cur2 >> C2_SHIFT]; - /* If we have not seen this color before, find nearest colormap */ - /* entry and update the cache */ - if (*cachep == 0) -#ifdef ORIGINAL_LIB_JPEG - fill_inverse_cmap (cinfo, cur0 >> C0_SHIFT, cur1 >> C1_SHIFT, - cur2 >> C2_SHIFT); -#else - fill_inverse_cmap (oim, nim, cquantize, cur0 >> C0_SHIFT, - cur1 >> C1_SHIFT, cur2 >> C2_SHIFT); -#endif - /* Now emit the colormap index for this cell */ - { - register int pixcode = *cachep - 1; - *outptr = (JSAMPLE) pixcode; - /* Compute representation error for this pixel */ -#define GETJSAMPLE - cur0 -= GETJSAMPLE (colormap0[pixcode]); - cur1 -= GETJSAMPLE (colormap1[pixcode]); - cur2 -= GETJSAMPLE (colormap2[pixcode]); -#undef GETJSAMPLE - } - /* Compute error fractions to be propagated to adjacent pixels. - * Add these into the running sums, and simultaneously shift the - * next-line error sums left by 1 column. - */ - { - register LOCFSERROR bnexterr, delta; - - bnexterr = cur0; /* Process component 0 */ - delta = cur0 * 2; - cur0 += delta; /* form error * 3 */ - errorptr[0] = (FSERROR) (bpreverr0 + cur0); - cur0 += delta; /* form error * 5 */ - bpreverr0 = belowerr0 + cur0; - belowerr0 = bnexterr; - cur0 += delta; /* form error * 7 */ - bnexterr = cur1; /* Process component 1 */ - delta = cur1 * 2; - cur1 += delta; /* form error * 3 */ - errorptr[1] = (FSERROR) (bpreverr1 + cur1); - cur1 += delta; /* form error * 5 */ - bpreverr1 = belowerr1 + cur1; - belowerr1 = bnexterr; - cur1 += delta; /* form error * 7 */ - bnexterr = cur2; /* Process component 2 */ - delta = cur2 * 2; - cur2 += delta; /* form error * 3 */ - errorptr[2] = (FSERROR) (bpreverr2 + cur2); - cur2 += delta; /* form error * 5 */ - bpreverr2 = belowerr2 + cur2; - belowerr2 = bnexterr; - cur2 += delta; /* form error * 7 */ - } - /* At this point curN contains the 7/16 error value to be propagated - * to the next pixel on the current line, and all the errors for the - * next line have been shifted over. We are therefore ready to move on. - */ -#ifdef ORIGINAL_LIB_JPEG - inptr += dir3; /* Advance pixel pointers to next column */ -#else - inptr += dir; /* Advance pixel pointers to next column */ -#endif - outptr += dir; - errorptr += dir3; /* advance errorptr to current column */ - } - /* Post-loop cleanup: we must unload the final error values into the - * final fserrors[] entry. Note we need not unload belowerrN because - * it is for the dummy column before or after the actual array. - */ - errorptr[0] = (FSERROR) bpreverr0; /* unload prev errs into array */ - errorptr[1] = (FSERROR) bpreverr1; - errorptr[2] = (FSERROR) bpreverr2; - } -} - - -/* - * Initialize the error-limiting transfer function (lookup table). - * The raw F-S error computation can potentially compute error values of up to - * +- MAXJSAMPLE. But we want the maximum correction applied to a pixel to be - * much less, otherwise obviously wrong pixels will be created. (Typical - * effects include weird fringes at color-area boundaries, isolated bright - * pixels in a dark area, etc.) The standard advice for avoiding this problem - * is to ensure that the "corners" of the color cube are allocated as output - * colors; then repeated errors in the same direction cannot cause cascading - * error buildup. However, that only prevents the error from getting - * completely out of hand; Aaron Giles reports that error limiting improves - * the results even with corner colors allocated. - * A simple clamping of the error values to about +- MAXJSAMPLE/8 works pretty - * well, but the smoother transfer function used below is even better. Thanks - * to Aaron Giles for this idea. - */ - -LOCAL (void) -#ifdef ORIGINAL_LIB_JPEG -init_error_limit (j_decompress_ptr cinfo) -#else -init_error_limit (gdImagePtr oim, gdImagePtr nim, my_cquantize_ptr cquantize) -#endif -/* Allocate and fill in the error_limiter table */ -{ - int *table; - int in, out; -#ifdef ORIGINAL_LIB_JPEG - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - table = (int *) (*cinfo->mem->alloc_small) - ((j_common_ptr) cinfo, JPOOL_IMAGE, (MAXJSAMPLE * 2 + 1) * SIZEOF (int)); -#else - cquantize->error_limiter_storage = - (int *) safe_emalloc ((MAXJSAMPLE * 2 + 1), sizeof (int), 0); - if (!cquantize->error_limiter_storage) - { - return; - } - table = cquantize->error_limiter_storage; -#endif - - table += MAXJSAMPLE; /* so can index -MAXJSAMPLE .. +MAXJSAMPLE */ - cquantize->error_limiter = table; - -#define STEPSIZE ((MAXJSAMPLE+1)/16) - /* Map errors 1:1 up to +- MAXJSAMPLE/16 */ - out = 0; - for (in = 0; in < STEPSIZE; in++, out++) - { - table[in] = out; - table[-in] = -out; - } - /* Map errors 1:2 up to +- 3*MAXJSAMPLE/16 */ - for (; in < STEPSIZE * 3; in++, out += (in & 1) ? 0 : 1) - { - table[in] = out; - table[-in] = -out; - } - /* Clamp the rest to final out value (which is (MAXJSAMPLE+1)/8) */ - for (; in <= MAXJSAMPLE; in++) - { - table[in] = out; - table[-in] = -out; - } -#undef STEPSIZE -} - - -/* - * Finish up at the end of each pass. - */ - -#ifdef ORIGINAL_LIB_JPEG -METHODDEF (void) -finish_pass1 (j_decompress_ptr cinfo) -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - - /* Select the representative colors and fill in cinfo->colormap */ - cinfo->colormap = cquantize->sv_colormap; - select_colors (cinfo, cquantize->desired); - /* Force next pass to zero the color index table */ - cquantize->needs_zeroed = TRUE; -} - - -METHODDEF (void) -finish_pass2 (j_decompress_ptr cinfo) -{ - /* no work */ -} - -/* - * Initialize for each processing pass. - */ - -METHODDEF (void) -start_pass_2_quant (j_decompress_ptr cinfo, boolean is_pre_scan) -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - hist3d histogram = cquantize->histogram; - int i; - - /* Only F-S dithering or no dithering is supported. */ - /* If user asks for ordered dither, give him F-S. */ - if (cinfo->dither_mode != JDITHER_NONE) - cinfo->dither_mode = JDITHER_FS; - - if (is_pre_scan) - { - /* Set up method pointers */ - cquantize->pub.color_quantize = prescan_quantize; - cquantize->pub.finish_pass = finish_pass1; - cquantize->needs_zeroed = TRUE; /* Always zero histogram */ - } - else - { - /* Set up method pointers */ - if (cinfo->dither_mode == JDITHER_FS) - cquantize->pub.color_quantize = pass2_fs_dither; - else - cquantize->pub.color_quantize = pass2_no_dither; - cquantize->pub.finish_pass = finish_pass2; - - /* Make sure color count is acceptable */ - i = cinfo->actual_number_of_colors; - if (i < 1) - ERREXIT1 (cinfo, JERR_QUANT_FEW_COLORS, 1); - if (i > MAXNUMCOLORS) - ERREXIT1 (cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS); - - if (cinfo->dither_mode == JDITHER_FS) - { - size_t arraysize = (size_t) ((cinfo->output_width + 2) * - (3 * SIZEOF (FSERROR))); - /* Allocate Floyd-Steinberg workspace if we didn't already. */ - if (cquantize->fserrors == NULL) - cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large) - ((j_common_ptr) cinfo, JPOOL_IMAGE, arraysize); - /* Initialize the propagated errors to zero. */ - jzero_far ((void FAR *) cquantize->fserrors, arraysize); - /* Make the error-limit table if we didn't already. */ - if (cquantize->error_limiter == NULL) - init_error_limit (cinfo); - cquantize->on_odd_row = FALSE; - } - - } - /* Zero the histogram or inverse color map, if necessary */ - if (cquantize->needs_zeroed) - { - for (i = 0; i < HIST_C0_ELEMS; i++) - { - jzero_far ((void FAR *) histogram[i], - HIST_C1_ELEMS * HIST_C2_ELEMS * SIZEOF (histcell)); - } - cquantize->needs_zeroed = FALSE; - } -} - - -/* - * Switch to a new external colormap between output passes. - */ - -METHODDEF (void) -new_color_map_2_quant (j_decompress_ptr cinfo) -{ - my_cquantize_ptr cquantize = (my_cquantize_ptr) cinfo->cquantize; - - /* Reset the inverse color map */ - cquantize->needs_zeroed = TRUE; -} -#else -static void -zeroHistogram (hist3d histogram) -{ - int i; - /* Zero the histogram or inverse color map */ - for (i = 0; i < HIST_C0_ELEMS; i++) - { - memset (histogram[i], - 0, HIST_C1_ELEMS * HIST_C2_ELEMS * sizeof (histcell)); - } -} -#endif - -static void gdImageTrueColorToPaletteBody (gdImagePtr oim, int dither, int colorsWanted, gdImagePtr *cimP); - -gdImagePtr gdImageCreatePaletteFromTrueColor (gdImagePtr im, int dither, int colorsWanted) -{ - gdImagePtr nim; - gdImageTrueColorToPaletteBody(im, dither, colorsWanted, &nim); - return nim; -} - -void gdImageTrueColorToPalette (gdImagePtr im, int dither, int colorsWanted) -{ - gdImageTrueColorToPaletteBody(im, dither, colorsWanted, 0); -} - -/* - * Module initialization routine for 2-pass color quantization. - */ - -#ifdef ORIGINAL_LIB_JPEG -GLOBAL (void) -jinit_2pass_quantizer (j_decompress_ptr cinfo) -#else -static void gdImageTrueColorToPaletteBody (gdImagePtr oim, int dither, int colorsWanted, gdImagePtr *cimP) -#endif -{ - my_cquantize_ptr cquantize = NULL; - int i; - -#ifndef ORIGINAL_LIB_JPEG - /* Allocate the JPEG palette-storage */ - size_t arraysize; - int maxColors = gdMaxColors; - gdImagePtr nim; - if (cimP) { - nim = gdImageCreate(oim->sx, oim->sy); - *cimP = nim; - if (!nim) { - return; - } - } else { - nim = oim; - } - if (!oim->trueColor) - { - /* (Almost) nothing to do! */ - if (cimP) { - gdImageCopy(nim, oim, 0, 0, 0, 0, oim->sx, oim->sy); - *cimP = nim; - } - return; - } - - /* If we have a transparent color (the alphaless mode of transparency), we - * must reserve a palette entry for it at the end of the palette. */ - if (oim->transparent >= 0) - { - maxColors--; - } - if (colorsWanted > maxColors) - { - colorsWanted = maxColors; - } - if (!cimP) { - nim->pixels = gdCalloc (sizeof (unsigned char *), oim->sy); - if (!nim->pixels) - { - /* No can do */ - goto outOfMemory; - } - for (i = 0; (i < nim->sy); i++) - { - nim->pixels[i] = gdCalloc (sizeof (unsigned char *), oim->sx); - if (!nim->pixels[i]) - { - goto outOfMemory; - } - } - } -#endif - -#ifdef ORIGINAL_LIB_JPEG - cquantize = (my_cquantize_ptr) - (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE, - SIZEOF (my_cquantizer)); - cinfo->cquantize = (struct jpeg_color_quantizer *) cquantize; - cquantize->pub.start_pass = start_pass_2_quant; - cquantize->pub.new_color_map = new_color_map_2_quant; - /* Make sure jdmaster didn't give me a case I can't handle */ - if (cinfo->out_color_components != 3) - ERREXIT (cinfo, JERR_NOTIMPL); -#else - cquantize = (my_cquantize_ptr) gdCalloc (sizeof (my_cquantizer), 1); - if (!cquantize) - { - /* No can do */ - goto outOfMemory; - } -#endif - cquantize->fserrors = NULL; /* flag optional arrays not allocated */ - cquantize->error_limiter = NULL; - - - /* Allocate the histogram/inverse colormap storage */ -#ifdef ORIGINAL_LIB_JPEG - cquantize->histogram = (hist3d) (*cinfo->mem->alloc_small) - ((j_common_ptr) cinfo, JPOOL_IMAGE, HIST_C0_ELEMS * SIZEOF (hist2d)); - for (i = 0; i < HIST_C0_ELEMS; i++) - { - cquantize->histogram[i] = (hist2d) (*cinfo->mem->alloc_large) - ((j_common_ptr) cinfo, JPOOL_IMAGE, - HIST_C1_ELEMS * HIST_C2_ELEMS * SIZEOF (histcell)); - } - cquantize->needs_zeroed = TRUE; /* histogram is garbage now */ -#else - cquantize->histogram = (hist3d) safe_emalloc (HIST_C0_ELEMS, sizeof (hist2d), 0); - for (i = 0; i < HIST_C0_ELEMS; i++) - { - cquantize->histogram[i] = - (hist2d) safe_emalloc (HIST_C1_ELEMS * HIST_C2_ELEMS, sizeof (histcell), 0); - if (!cquantize->histogram[i]) - { - goto outOfMemory; - } - } -#endif - -#ifdef ORIGINAL_LIB_JPEG - /* Allocate storage for the completed colormap, if required. - * We do this now since it is FAR storage and may affect - * the memory manager's space calculations. - */ - if (cinfo->enable_2pass_quant) - { - /* Make sure color count is acceptable */ - int desired = cinfo->desired_number_of_colors; - /* Lower bound on # of colors ... somewhat arbitrary as long as > 0 */ - if (desired < 8) - ERREXIT1 (cinfo, JERR_QUANT_FEW_COLORS, 8); - /* Make sure colormap indexes can be represented by JSAMPLEs */ - if (desired > MAXNUMCOLORS) - ERREXIT1 (cinfo, JERR_QUANT_MANY_COLORS, MAXNUMCOLORS); - cquantize->sv_colormap = (*cinfo->mem->alloc_sarray) - ((j_common_ptr) cinfo, JPOOL_IMAGE, (JDIMENSION) desired, - (JDIMENSION) 3); - cquantize->desired = desired; - } - else - cquantize->sv_colormap = NULL; - - /* Only F-S dithering or no dithering is supported. */ - /* If user asks for ordered dither, give him F-S. */ - if (cinfo->dither_mode != JDITHER_NONE) - cinfo->dither_mode = JDITHER_FS; - - /* Allocate Floyd-Steinberg workspace if necessary. - * This isn't really needed until pass 2, but again it is FAR storage. - * Although we will cope with a later change in dither_mode, - * we do not promise to honor max_memory_to_use if dither_mode changes. - */ - if (cinfo->dither_mode == JDITHER_FS) - { - cquantize->fserrors = (FSERRPTR) (*cinfo->mem->alloc_large) - ((j_common_ptr) cinfo, JPOOL_IMAGE, - (size_t) ((cinfo->output_width + 2) * (3 * SIZEOF (FSERROR)))); - /* Might as well create the error-limiting table too. */ - init_error_limit (cinfo); - } -#else - - cquantize->fserrors = (FSERRPTR) safe_emalloc (3, sizeof (FSERROR), 0); - init_error_limit (oim, nim, cquantize); - arraysize = (size_t) ((nim->sx + 2) * (3 * sizeof (FSERROR))); - /* Allocate Floyd-Steinberg workspace. */ - cquantize->fserrors = gdRealloc(cquantize->fserrors, arraysize); - memset(cquantize->fserrors, 0, arraysize); - if (!cquantize->fserrors) - { - goto outOfMemory; - } - cquantize->on_odd_row = FALSE; - - /* Do the work! */ - zeroHistogram (cquantize->histogram); - prescan_quantize (oim, nim, cquantize); - /* TBB 2.0.5: pass colorsWanted, not 256! */ - select_colors (oim, nim, cquantize, colorsWanted); - zeroHistogram (cquantize->histogram); - if (dither) - { - pass2_fs_dither (oim, nim, cquantize); - } - else - { - pass2_no_dither (oim, nim, cquantize); - } -#if 0 /* 2.0.12; we no longer attempt full alpha in palettes */ - if (cquantize->transparentIsPresent) - { - int mt = -1; - int mtIndex = -1; - for (i = 0; (i < im->colorsTotal); i++) - { - if (im->alpha[i] > mt) - { - mtIndex = i; - mt = im->alpha[i]; - } - } - for (i = 0; (i < im->colorsTotal); i++) - { - if (im->alpha[i] == mt) - { - im->alpha[i] = gdAlphaTransparent; - } - } - } - if (cquantize->opaqueIsPresent) - { - int mo = 128; - int moIndex = -1; - for (i = 0; (i < im->colorsTotal); i++) - { - if (im->alpha[i] < mo) - { - moIndex = i; - mo = im->alpha[i]; - } - } - for (i = 0; (i < im->colorsTotal); i++) - { - if (im->alpha[i] == mo) - { - im->alpha[i] = gdAlphaOpaque; - } - } - } -#endif - - /* If we had a 'transparent' color, increment the color count so it's - * officially in the palette and convert the transparent variable to point to - * an index rather than a color (Its data already exists and transparent - * pixels have already been mapped to it by this point, it is done late as to - * avoid color matching / dithering with it). */ - if (oim->transparent >= 0) - { - nim->transparent = nim->colorsTotal; - nim->colorsTotal++; - } - - /* Success! Get rid of the truecolor image data. */ - if (!cimP) { - oim->trueColor = 0; - /* Junk the truecolor pixels */ - for (i = 0; i < oim->sy; i++) - { - gdFree (oim->tpixels[i]); - } - gdFree (oim->tpixels); - oim->tpixels = 0; - } - goto success; - /* Tediously free stuff. */ -outOfMemory: - if (oim->trueColor) - { - if (!cimP) { - /* On failure only */ - for (i = 0; i < nim->sy; i++) - { - if (nim->pixels[i]) - { - gdFree (nim->pixels[i]); - } - } - if (nim->pixels) - { - gdFree (nim->pixels); - } - nim->pixels = 0; - } else { - gdImageDestroy(nim); - *cimP = 0; - } - } -success: - for (i = 0; i < HIST_C0_ELEMS; i++) - { - if (cquantize->histogram[i]) - { - gdFree (cquantize->histogram[i]); - } - } - if (cquantize->histogram) - { - gdFree (cquantize->histogram); - } - if (cquantize->fserrors) - { - gdFree (cquantize->fserrors); - } - if (cquantize->error_limiter_storage) - { - gdFree (cquantize->error_limiter_storage); - } - if (cquantize) - { - gdFree (cquantize); - } - -#endif -} - - -/* bring the palette colors in im2 to be closer to im1 - * - */ -int gdImageColorMatch (gdImagePtr im1, gdImagePtr im2) -{ - unsigned long *buf; /* stores our calculations */ - unsigned long *bp; /* buf ptr */ - int color, rgb; - int x,y; - int count; - - if( !im1->trueColor ) { - return -1; /* im1 must be True Color */ - } - if( im2->trueColor ) { - return -2; /* im2 must be indexed */ - } - if( (im1->sx != im2->sx) || (im1->sy != im2->sy) ) { - return -3; /* the images are meant to be the same dimensions */ - } - - buf = (unsigned long *)safe_emalloc(sizeof(unsigned long), 5 * im2->colorsTotal, 0); - memset( buf, 0, sizeof(unsigned long) * 5 * im2->colorsTotal ); - - for (x=0; x<im1->sx; x++) { - for( y=0; y<im1->sy; y++ ) { - color = im2->pixels[y][x]; - rgb = im1->tpixels[y][x]; - bp = buf + (color * 5); - (*(bp++))++; - *(bp++) += gdTrueColorGetRed(rgb); - *(bp++) += gdTrueColorGetGreen(rgb); - *(bp++) += gdTrueColorGetBlue(rgb); - *(bp++) += gdTrueColorGetAlpha(rgb); - } - } - bp = buf; - for (color=0; color<im2->colorsTotal; color++) { - count = *(bp++); - if( count > 0 ) { - im2->red[color] = *(bp++) / count; - im2->green[color] = *(bp++) / count; - im2->blue[color] = *(bp++) / count; - im2->alpha[color] = *(bp++) / count; - } else { - bp += 4; - } - } - gdFree(buf); - return 0; -} - - -#endif |