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//-----------------------------------------------------------------------------
//
// ImageLib Sources
// Copyright (C) 2000-2009 by Denton Woods
// Last modified: 02/04/2009
//
// Filename: src-IL/src/il_utility.c
//
// Description: Utility functions
//
//-----------------------------------------------------------------------------
#include "il_internal.h"
// Returns the bpp of any Format
ILAPI ILubyte ILAPIENTRY ilGetBppFormat(ILenum Format)
{
switch (Format)
{
case IL_COLOUR_INDEX:
case IL_LUMINANCE:
case IL_ALPHA:
return 1;
case IL_LUMINANCE_ALPHA:
return 2;
case IL_RGB:
case IL_BGR:
return 3;
case IL_RGBA:
case IL_BGRA:
return 4;
}
return 0;
}
// Returns the format of any bpp
ILAPI ILenum ILAPIENTRY ilGetFormatBpp(ILubyte Bpp)
{
switch (Bpp)
{
case 1:
return IL_LUMINANCE;
case 2:
return IL_LUMINANCE_ALPHA;
case 3:
return IL_RGB;
case 4:
return IL_RGBA;
}
return 0;
}
// Returns the bpc of any Type
ILAPI ILubyte ILAPIENTRY ilGetBpcType(ILenum Type)
{
switch (Type)
{
case IL_BYTE:
case IL_UNSIGNED_BYTE:
return 1;
case IL_SHORT:
case IL_UNSIGNED_SHORT:
case IL_HALF:
return 2;
case IL_INT:
case IL_UNSIGNED_INT:
case IL_FLOAT:
return 4;
case IL_DOUBLE:
return 8;
}
return 0;
}
// Returns the type matching a bpc
ILAPI ILenum ILAPIENTRY ilGetTypeBpc(ILubyte Bpc)
{
switch (Bpc)
{
case 1:
return IL_UNSIGNED_BYTE;
case 2:
return IL_UNSIGNED_SHORT;
case 4:
return IL_UNSIGNED_INT;
case 8:
return IL_DOUBLE;
}
return 0;
}
// Returns the bpp of any palette type (PalType)
ILAPI ILubyte ILAPIENTRY ilGetBppPal(ILenum PalType)
{
switch (PalType)
{
case IL_PAL_RGB24:
case IL_PAL_BGR24:
return 3;
case IL_PAL_RGB32:
case IL_PAL_RGBA32:
case IL_PAL_BGR32:
case IL_PAL_BGRA32:
return 4;
}
return 0;
}
// Returns the base format of a palette type (PalType)
ILAPI ILenum ILAPIENTRY ilGetPalBaseType(ILenum PalType)
{
switch (PalType)
{
case IL_PAL_RGB24:
return IL_RGB;
case IL_PAL_RGB32:
return IL_RGBA; // Not sure
case IL_PAL_RGBA32:
return IL_RGBA;
case IL_PAL_BGR24:
return IL_BGR;
case IL_PAL_BGR32:
return IL_BGRA; // Not sure
case IL_PAL_BGRA32:
return IL_BGRA;
}
return 0;
}
// Returns the next power of 2 if Num isn't 2^n or returns Num if Num is 2^n
ILAPI ILuint ILAPIENTRY ilNextPower2(ILuint n)
{
ILuint power = 1;
while( power < n ) {
power <<= 1;
}
return power;
}
ILAPI void ILAPIENTRY iMemSwap(ILubyte *s1, ILubyte *s2, const ILuint size)
{
const ILuint block_size = 4096;
const ILuint blocks = size/block_size;
ILuint i;
ILubyte *block = (ILubyte*)ialloc(block_size);
if(block == NULL) return;
for( i = 0; i < blocks; i++ ) {
memcpy(block,s1,block_size);
memcpy(s1,s2,block_size);
memcpy(s2,block,block_size);
s2 += block_size;
s1 += block_size;
}
i = size - i*block_size;
if( i > 0 ) {
memcpy(block,s1,i);
memcpy(s1,s2,i);
memcpy(s2,block,i);
}
ifree(block);
return;
}
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