static inline bool color_equal_16(color_t c1, color_t c2, int tolerance)
{
if (tolerance == 0)
return (c1 == c2) || (graya_geta(c1) == 0 && graya_geta(c2) == 0);
else {
int k1 = graya_getv(c1);
int a1 = graya_geta(c1);
int k2 = graya_getv(c2);
int a2 = graya_geta(c2);
if (a1 == 0 && a2 == 0)
return true;
return ((ABS(k1-k2) <= tolerance) &&
(ABS(a1-a2) <= tolerance));
}
}
inline void operator()(RgbTraits::pixel_t& scanline,
const RgbTraits::pixel_t& dst,
const GrayscaleTraits::pixel_t& src,
int opacity)
{
if (src != m_mask_color) {
int v = graya_getv(src);
scanline = (*m_blend_color)(dst, rgba(v, v, v, graya_geta(src)), opacity);
}
else
scanline = dst;
}
raster::color_t color_utils::fixup_color_for_background(PixelFormat format, raster::color_t color)
{
switch (format) {
case IMAGE_RGB:
if (rgba_geta(color) < 255) {
return rgba(rgba_getr(color),
rgba_getg(color),
rgba_getb(color), 255);
}
break;
case IMAGE_GRAYSCALE:
if (graya_geta(color) < 255) {
return graya(graya_getv(color), 255);
}
break;
}
return color;
}
int convert_color_to_allegro<GrayscaleTraits, 32>(color_t c, const Palette* palette) {
return makeacol32(graya_getv(c), graya_getv(c), graya_getv(c), graya_geta(c));
}
int convert_color_to_allegro<GrayscaleTraits, 24>(color_t c, const Palette* palette) {
return makecol24(graya_getv(c), graya_getv(c), graya_getv(c));
}