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Last interpolation stage of trilinear now uses some mults less

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git-svn-id: svn://svn.code.sf.net/p/sc2/code/trunk@886 8092fc87-c524-0410-9efc-e669fe64eaf9
This commit is contained in:
gewlitys
2003-03-15 23:55:42 +00:00
parent e6a8d4fe7c
commit 84bc3cca4b
1 changed files with 9 additions and 11 deletions
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sc2/src/sc2code/libs/graphics/sdl/canvas.c
+9 -11
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@@ -461,12 +461,10 @@ TFB_DrawCanvas_Rescale_Trilinear (TFB_Canvas src_canvas, TFB_Canvas dest_canvas,
const int ALPHA_THRESHOLD = 128;
float ratio = ((float)w / src->w) * 2.0f - 1.0f;
float om_ratio;
if (ratio < 0.0f)
ratio = 0.0f;
if (ratio > 1.0f)
ratio = 1.0f;
om_ratio = 1.0f - ratio;
if (size.width > dst->w || size.height > dst->h)
{
@@ -634,12 +632,12 @@ TFB_DrawCanvas_Rescale_Trilinear (TFB_Canvas src_canvas, TFB_Canvas dest_canvas,
g1[4] = (Uint8)(ul1 * g1[0] + ur1 * g1[1] + ll1 * g1[2] + lr1 * g1[3]);
b1[4] = (Uint8)(ul1 * b1[0] + ur1 * b1[1] + ll1 * b1[2] + lr1 * b1[3]);
a1[4] = (Uint8)(ul1 * a1[0] + ur1 * a1[1] + ll1 * a1[2] + lr1 * a1[3]);
*dst_p = SDL_MapRGBA(dst->format,
(Uint8)(ratio * r0[4] + om_ratio * r1[4]),
(Uint8)(ratio * g0[4] + om_ratio * g1[4]),
(Uint8)(ratio * b0[4] + om_ratio * b1[4]),
(Uint8)((ratio * a0[4] + om_ratio * a1[4]) > ALPHA_THRESHOLD ? 255 : 0));
(Uint8)((r0[4] - r1[4]) * ratio + r1[4]),
(Uint8)((g0[4] - g1[4]) * ratio + g1[4]),
(Uint8)((b0[4] - b1[4]) * ratio + b1[4]),
(Uint8)(((a0[4] - a1[4]) * ratio + a1[4]) > ALPHA_THRESHOLD ? 255 : 0));
u0 += fsx0;
u1 += fsx1;
@@ -798,10 +796,10 @@ TFB_DrawCanvas_Rescale_Trilinear (TFB_Canvas src_canvas, TFB_Canvas dest_canvas,
a1[4] = (Uint8)(ul1 * a1[0] + ur1 * a1[1] + ll1 * a1[2] + lr1 * a1[3]);
*dst_p = SDL_MapRGBA(dst->format,
(Uint8)(ratio * r0[4] + om_ratio * r1[4]),
(Uint8)(ratio * g0[4] + om_ratio * g1[4]),
(Uint8)(ratio * b0[4] + om_ratio * b1[4]),
(Uint8)((ratio * a0[4] + om_ratio * a1[4]) > ALPHA_THRESHOLD ? 255 : 0));
(Uint8)((r0[4] - r1[4]) * ratio + r1[4]),
(Uint8)((g0[4] - g1[4]) * ratio + g1[4]),
(Uint8)((b0[4] - b1[4]) * ratio + b1[4]),
(Uint8)(((a0[4] - a1[4]) * ratio + a1[4]) > ALPHA_THRESHOLD ? 255 : 0));
u0 += fsx0;
u1 += fsx1;