Android/frameworks_base
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Add extra blending modes.

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This change adds the following blending modes for shaders and color filters:
Add
Multiply
Screen
Overlay
Darken
Lighten

Change-Id: Iff22f5ce6041b43c71b1857d73013f5010ab3413
This commit is contained in:
Romain Guy
2010-08-10 19:21:34 -07:00
parent a674ab74e3
commit 48daa54d31
5 changed files with 179 additions and 19 deletions
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31
libs/hwui/ProgramCache.cpp
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@@ -137,7 +137,7 @@ const char* gFS_Footer =
// PorterDuff snippets
///////////////////////////////////////////////////////////////////////////////
const char* gPorterDuff[12] = {
const char* gBlendOps[18] = {
// Clear
"return vec4(0.0, 0.0, 0.0, 0.0);\n",
// Src
@@ -161,8 +161,26 @@ const char* gPorterDuff[12] = {
// DstAtop
"return vec4(dst.rgb * src.a + (1.0 - dst.a) * src.rgb, src.a);\n",
// Xor
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb, 1.0, "
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb, "
"src.a + dst.a - 2.0 * src.a * dst.a);\n",
// Add
"return min(src + dst, 1.0);\n",
// Multiply
"return src * dst;\n",
// Screen
"return src + dst - src * dst;\n",
// Overlay
"return clamp(vec4(mix("
"2.0 * src.rgb * dst.rgb + src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a), "
"src.a * dst.a - 2.0 * (dst.a - dst.rgb) * (src.a - src.rgb) + src.rgb * (1.0 - dst.a) + dst.rgb * (1.0 - src.a), "
"step(dst.a, 2.0 * dst.rgb)), "
"src.a + dst.a - src.a * dst.a), 0.0, 1.0);\n",
// Darken
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb + "
"min(src.rgb * dst.a, dst.rgb * src.a), src.a + dst.a - src.a * dst.a);\n",
// Lighten
"return vec4(src.rgb * (1.0 - dst.a) + (1.0 - src.a) * dst.rgb + "
"max(src.rgb * dst.a, dst.rgb * src.a), src.a + dst.a - src.a * dst.a);\n",
};
///////////////////////////////////////////////////////////////////////////////
@@ -292,10 +310,10 @@ String8 ProgramCache::generateFragmentShader(const ProgramDescription& descripti
// Generate required functions
if (description.hasGradient && description.hasBitmap) {
generatePorterDuffBlend(shader, "blendShaders", description.shadersMode);
generateBlend(shader, "blendShaders", description.shadersMode);
}
if (description.colorOp == ProgramDescription::kColorBlend) {
generatePorterDuffBlend(shader, "blendColors", description.colorMode);
generateBlend(shader, "blendColors", description.colorMode);
}
if (description.isBitmapNpot) {
generateTextureWrap(shader, description.bitmapWrapS, description.bitmapWrapT);
@@ -354,13 +372,12 @@ String8 ProgramCache::generateFragmentShader(const ProgramDescription& descripti
return shader;
}
void ProgramCache::generatePorterDuffBlend(String8& shader, const char* name,
SkXfermode::Mode mode) {
void ProgramCache::generateBlend(String8& shader, const char* name, SkXfermode::Mode mode) {
shader.append("\nvec4 ");
shader.append(name);
shader.append("(vec4 src, vec4 dst) {\n");
shader.append(" ");
shader.append(gPorterDuff[mode]);
shader.append(gBlendOps[mode]);
shader.append("}\n");
}