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#include <stdio.h>
#include <math.h>
#include "gd.h"
#include "gdtest.h"
int gen_image(const char* filename, int idx, int reverse_x, int width, int height, int bgd)
{
double gradient = height / (width*2.0);
int offset = idx*width;
int x1,y1,x2,y2, error = 0;
gdImagePtr im = gdImageCreateTrueColor(width,height);
if (bgd==1) {
gdImageFilledRectangle(im,0,0,width-1,height-1, gdTrueColorAlpha(255, 255, 255, 0));
} else {
gdImageFilledRectangle(im,0,0,width-1,height-1, gdTrueColorAlpha(255, 255, 0, 0));
}
gdImageSetAntiAliased(im, gdTrueColorAlpha(0,0,0,0));
/*
test for potential segfault (introduced with AA improvements, fixed
with the same patch - but I didn't notice it until later).*/
gdImageLine(im,-1,-1,-1,-1,gdAntiAliased);
x1 = floor(reverse_x * -width + 0.5);
y1 = (offset-width) * gradient + 0.5;
x2 = floor(reverse_x * width*2 + 0.5);
y2 = floor((offset+width*2) * gradient + 0.5);
/* draw an AA line */
gdImageLine(im, x1, y1, x2, y2, gdAntiAliased);
gdImageLine(im, 0, im->sy - 1, im->sx, im->sy - 1, 0x40FF0000);
if (!gdAssertImageEqualsToFile(filename, im)) {
gdTestErrorMsg("gdAssertImageEqualsToFile failed: <%s>\n", filename);
error = 1;
}
gdImageDestroy(im);
return error;
}
int main()
{
int error = 0;
error |= gen_image("gdimageline/gdimageline_aa_a_0_exp.png", 0, 1, 10, 100, 1);
error |= gen_image("gdimageline/gdimageline_aa_a_1_exp.png", 1, 1, 10, 100, 2);
error |= gen_image("gdimageline/gdimageline_aa_b_0_exp.png", 2, -1, 10, 100, 1);
error |= gen_image("gdimageline/gdimageline_aa_b_1_exp.png", 1, -1, 10, 100, 2);
error |= gen_image("gdimageline/gdimageline_aa_c_0_exp.png", 0, 1, 100, 10, 1);
error |= gen_image("gdimageline/gdimageline_aa_c_1_exp.png", 1, 1, 100, 10, 2);
error |= gen_image("gdimageline/gdimageline_aa_d_0_exp.png", 2, -1, 100, 10, 1);
error |= gen_image("gdimageline/gdimageline_aa_d_1_exp.png", 1, -1, 100, 10, 2);
return error;
}
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