double CompareScreenshot(const u8 *pixels, int w, int h, int stride, const std::string screenshotFilename, std::string &error)
{
u32 *pixels32 = (u32 *) pixels;
// We assume the bitmap is the specified size, not including whatever stride.
u32 *reference = (u32 *) calloc(w * h, sizeof(u32));
FILE *bmp = fopen(screenshotFilename.c_str(), "rb");
if (bmp)
{
// The bitmap header is 14 + 40 bytes. We could validate it but the test would fail either way.
fseek(bmp, 14 + 40, SEEK_SET);
fread(reference, sizeof(u32), w * h, bmp);
fclose(bmp);
}
else
{
error = "Unable to read screenshot: " + screenshotFilename;
free(reference);
return -1.0f;
}
u32 errors = 0;
for (int y = 0; y < h; ++y)
{
for (int x = 0; x < w; ++x)
errors += ComparePixel(pixels32[y * stride + x], reference[y * w + x]);
}
free(reference);
return (double) errors / (double) (w * h);
}
void FillWorker(unsigned long x, unsigned long y, char color, char oldColor)
{
SetPixel(x, y, color);
if (ComparePixel(x, y-1, oldColor))
{
FillWorker(x, y-1, color, oldColor);
}
if (ComparePixel(x, y+1, oldColor))
{
FillWorker(x, y+1, color, oldColor);
}
if (ComparePixel(x-1, y, oldColor))
{
FillWorker(x-1, y, color, oldColor);
}
if (ComparePixel(x+1, y, oldColor))
{
FillWorker(x+1, y, color, oldColor);
}
}
static float FindPixel(ImgType s1, int r1, int c1,
ImgType s2, int *pr2, int *pc2,
int BLOCK_SIZEX, int BLOCK_SIZEY,
int SEARCH_SIZEX, int SEARCH_SIZEY,
int OFFSET_X, int OFFSET_Y, int NORMALIZE)
{
int r2=(*pr2) + OFFSET_Y, c2=(*pc2) + OFFSET_X;
float best = 999999999999.0f, current, central=0;
float worst = 0;
int i, j;
int delx = SEARCH_SIZEX;
int dely = SEARCH_SIZEY;
for (i = -dely+OFFSET_Y; i <= dely+OFFSET_Y; i++)
{
for (j = -delx+OFFSET_X; j <= delx+OFFSET_X; j++)
{
int r1d = (*pr2)+i;
int c1d = (*pc2)+j;
if (c1 + BLOCK_SIZEX < IMG_W && c1 - BLOCK_SIZEX >= 0 &&
r1 + BLOCK_SIZEY < IMG_H && r1 - BLOCK_SIZEY >= 0 &&
c1d + BLOCK_SIZEX < IMG_W && c1d - BLOCK_SIZEX >= 0 &&
r1d + BLOCK_SIZEY < IMG_H && r1d - BLOCK_SIZEY >= 0)
{
current = ComparePixel(s1,r1,c1,s2,r1d,c1d,BLOCK_SIZEX,BLOCK_SIZEY,NORMALIZE);
if (i==0 && j==0)
{
central = current;
}
if (current<best || (current==best && i==0 && j==0))
{
r2 = (*pr2)+i;
c2 = (*pc2)+j;
best = current;
}
if (current > worst)
{
worst = current;
}
}
}
}
*pr2 = r2;
*pc2 = c2;
float safe = 10;
return (fabs(worst-best)+safe)/(best+safe);
}