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Unified Diff: src/gpu/GrSwizzle.h

Issue 1584473002: Swizzle shader output and blend when using GL_RED to implement kAlpha_8_GrPixelConfig (Closed) Base URL: https://skia.googlesource.com/skia.git@hideformats
Patch Set: Address comments Created 4 years, 11 months ago
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Index: src/gpu/GrSwizzle.h
diff --git a/src/gpu/GrSwizzle.h b/src/gpu/GrSwizzle.h
index 87ea9534b9e021bfc6d5b1d0e942b1c5168307fd..48748803ddb2d3daceea66233d7a0d238ff61b38 100644
--- a/src/gpu/GrSwizzle.h
+++ b/src/gpu/GrSwizzle.h
@@ -9,6 +9,7 @@
#define GrSwizzle_DEFINED
#include "GrTypes.h"
+#include "GrColor.h"
/** Represents a rgba swizzle. It can be converted either into a string or a eight bit int.
Currently there is no way to specify an arbitrary swizzle, just some static swizzles and an
@@ -17,11 +18,23 @@ class GrSwizzle {
public:
GrSwizzle() { *this = RGBA(); }
+ GrSwizzle(const GrSwizzle& that) { *this = that; }
+
GrSwizzle& operator=(const GrSwizzle& that) {
memcpy(this, &that, sizeof(GrSwizzle));
return *this;
}
+ /** Recreates a GrSwizzle from the output of asKey() */
+ void setFromKey(uint8_t key) {
+ fKey = key;
+ for (int i = 0; i < 4; ++i) {
+ fSwiz[i] = IdxToChar(key & 3);
+ key >>= 2;
+ }
+ SkASSERT(fSwiz[4] == 0);
+ }
+
bool operator==(const GrSwizzle& that) const { return this->asUInt() == that.asUInt(); }
bool operator!=(const GrSwizzle& that) const { return !(*this == that); }
@@ -32,6 +45,25 @@ public:
/** 4 char null terminated string consisting only of chars 'r', 'g', 'b', 'a'. */
const char* c_str() const { return fSwiz; }
+ /** Applies this swizzle to the input color and returns the swizzled color. */
+ GrColor applyTo(GrColor color) const {
+ int idx;
+ uint32_t key = fKey;
+ // Index of the input color that should be mapped to output r.
+ idx = (key & 3);
+ uint32_t outR = (color >> idx * 8) & 0xFF;
+ key >>= 2;
+ idx = (key & 3);
+ uint32_t outG = (color >> idx * 8) & 0xFF;
+ key >>= 2;
+ idx = (key & 3);
+ uint32_t outB = (color >> idx * 8) & 0xFF;
+ key >>= 2;
+ idx = (key & 3);
+ uint32_t outA = (color >> idx * 8) & 0xFF;
+ return GrColorPackRGBA(outR, outG, outB, outA);
+ }
+
static const GrSwizzle& RGBA() {
static GrSwizzle gRGBA("rgba");
return gRGBA;
@@ -59,19 +91,31 @@ private:
static int CharToIdx(char c) {
switch (c) {
case 'r':
- return 0;
+ return (GrColor_SHIFT_R / 8);
case 'g':
- return 1;
+ return (GrColor_SHIFT_G / 8);
case 'b':
- return 2;
+ return (GrColor_SHIFT_B / 8);
case 'a':
- return 3;
+ return (GrColor_SHIFT_A / 8);
default:
SkFAIL("Invalid swizzle char");
return 0;
}
}
+ static /* constexpr */ char IToC(int idx) {
+ return (8*idx) == GrColor_SHIFT_R ? 'r' :
+ (8*idx) == GrColor_SHIFT_G ? 'g' :
+ (8*idx) == GrColor_SHIFT_B ? 'b' : 'a';
+ }
+
+ static char IdxToChar(int c) {
+ // Hopefully this array gets computed at compile time.
+ static const char gStr[4] = { IToC(0), IToC(1), IToC(2), IToC(3) };
+ return gStr[c];
+ }
+
explicit GrSwizzle(const char* str) {
SkASSERT(strlen(str) == 4);
fSwiz[0] = str[0];
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