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comparison src/video/x11/SDL_x11render.c @ 4617:cfbb1ff4b8ec

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Add some comments.
author Sunny Sachanandani <sunnysachanandani@gmail.com>
date Wed, 28 Jul 2010 13:08:14 +0530
parents 05eb4a07e5e3
children 844b5ef4b149
comparison
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4616:05eb4a07e5e3 4617:cfbb1ff4b8ec
1036 1036
1037 if (renderdata->use_xrender) { 1037 if (renderdata->use_xrender) {
1038 1038
1039 Uint8 r = 0xFF, g = 0xFF, b = 0xFF, a = 0xFF; 1039 Uint8 r = 0xFF, g = 0xFF, b = 0xFF, a = 0xFF;
1040 1040
1041 /* Check if alpha modulation is required. */
1041 if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA) { 1042 if (texture->modMode & SDL_TEXTUREMODULATE_ALPHA) {
1042 a = texture->a; 1043 a = texture->a;
1043 } 1044 }
1044 1045
1046 /* Check if color modulation is required. */
1045 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) { 1047 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
1046 r = texture->r; 1048 r = texture->r;
1047 g = texture->g; 1049 g = texture->g;
1048 b = texture->b; 1050 b = texture->b;
1049 } 1051 }
1050 1052
1053 /* We can save some labour if no modulation is required. */
1051 if (texture->modMode != SDL_TEXTUREMODULATE_NONE) { 1054 if (texture->modMode != SDL_TEXTUREMODULATE_NONE) {
1052 XRenderColor mod_color = 1055 XRenderColor mod_color =
1053 SDLColorToXRenderColor(r, g, b, a); 1056 SDLColorToXRenderColor(r, g, b, a);
1054 XRenderFillRectangle(renderdata->display, PictOpSrc, 1057 XRenderFillRectangle(renderdata->display, PictOpSrc,
1055 renderdata->brush_pict, &mod_color, 1058 renderdata->brush_pict, &mod_color,
1056 0, 0, 1, 1); 1059 0, 0, 1, 1);
1057 } 1060 }
1058 1061
1062 /* We can save some labour dealing with component alpha
1063 * if color modulation is not required. */
1059 XRenderPictureAttributes attr; 1064 XRenderPictureAttributes attr;
1060 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) { 1065 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
1061 attr.component_alpha = True; 1066 attr.component_alpha = True;
1062 XRenderChangePicture(renderdata->display, renderdata->brush_pict, 1067 XRenderChangePicture(renderdata->display, renderdata->brush_pict,
1063 CPComponentAlpha, &attr); 1068 CPComponentAlpha, &attr);
1064 } 1069 }
1065 1070
1071 /* Again none of this is necessary is no modulation
1072 * is required. */
1066 if (texture->modMode != SDL_TEXTUREMODULATE_NONE) { 1073 if (texture->modMode != SDL_TEXTUREMODULATE_NONE) {
1067 XRenderComposite(renderdata->display, PictOpSrc, 1074 XRenderComposite(renderdata->display, PictOpSrc,
1068 data->picture, renderdata->brush_pict, 1075 data->picture, renderdata->brush_pict,
1069 data->modulated_picture, 1076 data->modulated_picture,
1070 0, 0, 0, 0, 0, 0, texture->w, texture->h); 1077 0, 0, 0, 0, 0, 0, texture->w, texture->h);
1071 } 1078 }
1072 1079
1080 /* We only need to reset the component alpha
1081 * attribute if color modulation is required. */
1073 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) { 1082 if (texture->modMode & SDL_TEXTUREMODULATE_COLOR) {
1074 attr.component_alpha = False; 1083 attr.component_alpha = False;
1075 XRenderChangePicture(renderdata->display, renderdata->brush_pict, 1084 XRenderChangePicture(renderdata->display, renderdata->brush_pict,
1076 CPComponentAlpha, &attr); 1085 CPComponentAlpha, &attr);
1077 } 1086 }