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Directy pack and unpack pixels.

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Most code already directly modifies the pixels instead of calling
SDL_GetRGBA. This change gives a minor speedup, but mainly done for
consistency and make it easier to test with CPU vector operations.
This commit is contained in:
Mark de Wever 2012-03-17 07:56:55 +00:00
parent 007b65a25a
commit 1b3b6a33c7
1 changed files with 10 additions and 11 deletions
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21
src/sdl_utils.cpp
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@ -361,13 +361,13 @@ scale_surface_down(surface& dst, const surface& src, const int w_dst, const int
++samples;
Uint8 r,g,b,a;
SDL_GetRGBA(src_pixels[y_src * w_src + x_src], src->format, &r, &g, &b, &a);
const Uint32 pixel = src_pixels[y_src * w_src + x_src];
const Uint8 a = pixel >> 24;
if(a) {
a_sum += a;
r_sum += r * a;
g_sum += g * a;
b_sum += b * a;
r_sum += a * static_cast<Uint8>(pixel >> 16);
g_sum += a * static_cast<Uint8>(pixel >> 8);
b_sum += a * static_cast<Uint8>(pixel);
}
}
}
@ -390,12 +390,11 @@ scale_surface_down(surface& dst, const surface& src, const int w_dst, const int
}
}
dst_pixels[y_dst * w_dst + x_dst] = SDL_MapRGBA(
dst->format
, r_sum
, g_sum
, b_sum
, a_sum);
dst_pixels[y_dst * w_dst + x_dst] =
static_cast<Uint8>(a_sum) << 24
| static_cast<Uint8>(r_sum) << 16
| static_cast<Uint8>(g_sum) << 8
| static_cast<Uint8>(b_sum);
}
}
}