notgne2/tuxpaint-pencil-sharpener
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Doing auto-starter-transparency more intelligently.

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This commit is contained in:
William Kendrick 2008-10-27 07:13:24 +00:00
parent 91eeb8b700
commit 6d493bf958
1 changed files with 30 additions and 6 deletions
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36
src/tuxpaint.c
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@ -11324,18 +11324,42 @@ static void load_starter(char *img_id)
putpixels[img_starter->format->BytesPerPixel];
Uint32 p;
Uint8 r, g, b, a;
int any_transparency;
for (y = 0; y < img_starter->h; y++)
any_transparency = 0;
for (y = 0; y < img_starter->h && !any_transparency; y++)
{
for (x = 0; x < img_starter->w; x++)
for (x = 0; x < img_starter->w && !any_transparency; x++)
{
p = getpixel(img_starter, x, y);
SDL_GetRGBA(p, img_starter->format, &r, &g, &b, &a);
if (abs(r - g) < 16 && abs(r - b) < 16 && abs(b - g) < 16)
a = 255 - ((r + g + b) / 3);
p = SDL_MapRGBA(img_starter->format, r, g, b, a);
putpixel(img_starter, x, y, p);
if (a < 255)
any_transparency = 1;
}
}
if (!any_transparency)
{
/* No transparency found! We MUST check for white pixels to save
the day! */
for (y = 0; y < img_starter->h; y++)
{
for (x = 0; x < img_starter->w; x++)
{
p = getpixel(img_starter, x, y);
SDL_GetRGBA(p, img_starter->format, &r, &g, &b, &a);
if (abs(r - g) < 16 && abs(r - b) < 16 && abs(b - g) < 16)
{
a = 255 - ((r + g + b) / 3);
}
p = SDL_MapRGBA(img_starter->format, r, g, b, a);
putpixel(img_starter, x, y, p);
}
}
}
}