Add SkTableColorFilter, as a foundation for several SVG filters
git-svn-id: http://skia.googlecode.com/svn/trunk@2933 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/effects/SkTableColorFilter.cpp b/src/effects/SkTableColorFilter.cpp
new file mode 100644
index 0000000..afbcdef
--- /dev/null
+++ b/src/effects/SkTableColorFilter.cpp
@@ -0,0 +1,199 @@
+#include "SkColorPriv.h"
+#include "SkTableColorFilter.h"
+#include "SkUnPreMultiply.h"
+
+class SkTable_ColorFilter : public SkColorFilter {
+public:
+ SkTable_ColorFilter(const uint8_t tableA[], const uint8_t tableR[],
+ const uint8_t tableG[], const uint8_t tableB[]) {
+ fFlags = 0;
+ uint8_t* dst = fStorage;
+ if (tableA) {
+ memcpy(dst, tableA, 256);
+ dst += 256;
+ fFlags |= kA_Flag;
+ }
+ if (tableR) {
+ memcpy(dst, tableR, 256);
+ dst += 256;
+ fFlags |= kR_Flag;
+ }
+ if (tableG) {
+ memcpy(dst, tableG, 256);
+ dst += 256;
+ fFlags |= kG_Flag;
+ }
+ if (tableB) {
+ memcpy(dst, tableB, 256);
+ fFlags |= kB_Flag;
+ }
+ }
+
+ virtual void filterSpan(const SkPMColor src[], int count,
+ SkPMColor dst[]) SK_OVERRIDE;
+ virtual void flatten(SkFlattenableWriteBuffer&) SK_OVERRIDE;
+ virtual Factory getFactory() SK_OVERRIDE;
+
+ static SkFlattenable* CreateProc(SkFlattenableReadBuffer& buffer) {
+ return SkNEW_ARGS(SkTable_ColorFilter, (buffer));
+ }
+
+protected:
+ SkTable_ColorFilter(SkFlattenableReadBuffer& buffer);
+
+private:
+ enum {
+ kA_Flag = 1 << 0,
+ kR_Flag = 1 << 1,
+ kG_Flag = 1 << 2,
+ kB_Flag = 1 << 3,
+ };
+ uint8_t fStorage[256 * 4];
+ unsigned fFlags;
+
+ typedef SkColorFilter INHERITED;
+};
+
+static const uint8_t gIdentityTable[] = {
+ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
+ 0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
+ 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
+ 0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
+ 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27,
+ 0x28, 0x29, 0x2A, 0x2B, 0x2C, 0x2D, 0x2E, 0x2F,
+ 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+ 0x38, 0x39, 0x3A, 0x3B, 0x3C, 0x3D, 0x3E, 0x3F,
+ 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47,
+ 0x48, 0x49, 0x4A, 0x4B, 0x4C, 0x4D, 0x4E, 0x4F,
+ 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57,
+ 0x58, 0x59, 0x5A, 0x5B, 0x5C, 0x5D, 0x5E, 0x5F,
+ 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67,
+ 0x68, 0x69, 0x6A, 0x6B, 0x6C, 0x6D, 0x6E, 0x6F,
+ 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77,
+ 0x78, 0x79, 0x7A, 0x7B, 0x7C, 0x7D, 0x7E, 0x7F,
+ 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
+ 0x88, 0x89, 0x8A, 0x8B, 0x8C, 0x8D, 0x8E, 0x8F,
+ 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97,
+ 0x98, 0x99, 0x9A, 0x9B, 0x9C, 0x9D, 0x9E, 0x9F,
+ 0xA0, 0xA1, 0xA2, 0xA3, 0xA4, 0xA5, 0xA6, 0xA7,
+ 0xA8, 0xA9, 0xAA, 0xAB, 0xAC, 0xAD, 0xAE, 0xAF,
+ 0xB0, 0xB1, 0xB2, 0xB3, 0xB4, 0xB5, 0xB6, 0xB7,
+ 0xB8, 0xB9, 0xBA, 0xBB, 0xBC, 0xBD, 0xBE, 0xBF,
+ 0xC0, 0xC1, 0xC2, 0xC3, 0xC4, 0xC5, 0xC6, 0xC7,
+ 0xC8, 0xC9, 0xCA, 0xCB, 0xCC, 0xCD, 0xCE, 0xCF,
+ 0xD0, 0xD1, 0xD2, 0xD3, 0xD4, 0xD5, 0xD6, 0xD7,
+ 0xD8, 0xD9, 0xDA, 0xDB, 0xDC, 0xDD, 0xDE, 0xDF,
+ 0xE0, 0xE1, 0xE2, 0xE3, 0xE4, 0xE5, 0xE6, 0xE7,
+ 0xE8, 0xE9, 0xEA, 0xEB, 0xEC, 0xED, 0xEE, 0xEF,
+ 0xF0, 0xF1, 0xF2, 0xF3, 0xF4, 0xF5, 0xF6, 0xF7,
+ 0xF8, 0xF9, 0xFA, 0xFB, 0xFC, 0xFD, 0xFE, 0xFF
+};
+
+void SkTable_ColorFilter::filterSpan(const SkPMColor src[], int count,
+ SkPMColor dst[]) {
+ const uint8_t* table = fStorage;
+ const uint8_t* tableA = gIdentityTable;
+ const uint8_t* tableR = gIdentityTable;
+ const uint8_t* tableG = gIdentityTable;
+ const uint8_t* tableB = gIdentityTable;
+ if (fFlags & kA_Flag) {
+ tableA = table; table += 256;
+ }
+ if (fFlags & kR_Flag) {
+ tableR = table; table += 256;
+ }
+ if (fFlags & kG_Flag) {
+ tableG = table; table += 256;
+ }
+ if (fFlags & kB_Flag) {
+ tableB = table;
+ }
+
+ const SkUnPreMultiply::Scale* scaleTable = SkUnPreMultiply::GetScaleTable();
+ for (int i = 0; i < count; ++i) {
+ SkPMColor c = src[i];
+ unsigned a, r, g, b;
+ if (0 == c) {
+ a = r = g = b = 0;
+ } else {
+ a = SkGetPackedA32(c);
+ r = SkGetPackedR32(c);
+ g = SkGetPackedG32(c);
+ b = SkGetPackedB32(c);
+
+ if (a < 255) {
+ SkUnPreMultiply::Scale scale = scaleTable[a];
+ r = SkUnPreMultiply::ApplyScale(scale, r);
+ g = SkUnPreMultiply::ApplyScale(scale, g);
+ b = SkUnPreMultiply::ApplyScale(scale, b);
+ }
+ }
+ dst[i] = SkPremultiplyARGBInline(tableA[a], tableR[r],
+ tableG[g], tableB[b]);
+ }
+}
+
+SkFlattenable::Factory SkTable_ColorFilter::getFactory() {
+ return CreateProc;
+}
+
+static const uint8_t gCountNibBits[] = {
+ 0, 1, 1, 2,
+ 1, 2, 2, 3,
+ 1, 2, 2, 3,
+ 2, 3, 3, 4
+};
+
+#include "SkPackBits.h"
+
+void SkTable_ColorFilter::flatten(SkFlattenableWriteBuffer& buffer) {
+ this->INHERITED::flatten(buffer);
+
+ uint8_t storage[5*256];
+ int count = gCountNibBits[fFlags & 0xF];
+ size_t size = SkPackBits::Pack8(fStorage, count * 256, storage);
+ SkASSERT(size <= sizeof(storage));
+
+// SkDebugf("raw %d packed %d\n", count * 256, size);
+
+ buffer.writeInt(fFlags);
+ buffer.writeInt(size);
+ buffer.write(storage, size);
+}
+
+SkTable_ColorFilter::SkTable_ColorFilter(SkFlattenableReadBuffer& buffer) : INHERITED(buffer) {
+ uint8_t storage[5*256];
+
+ fFlags = buffer.readInt();
+ size_t size = buffer.readInt();
+ buffer.read(storage, size);
+
+ size_t raw = SkPackBits::Unpack8(storage, size, fStorage);
+
+ SkASSERT(raw <= sizeof(fStorage));
+ int count = gCountNibBits[fFlags & 0xF];
+ SkASSERT(raw == count * 256);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+#ifdef SK_CPU_BENDIAN
+#else
+ #define SK_A32_INDEX (3 - (SK_A32_SHIFT >> 3))
+ #define SK_R32_INDEX (3 - (SK_R32_SHIFT >> 3))
+ #define SK_G32_INDEX (3 - (SK_G32_SHIFT >> 3))
+ #define SK_B32_INDEX (3 - (SK_B32_SHIFT >> 3))
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkColorFilter* SkTableColorFilter::Create(const uint8_t table[256]) {
+ return SkNEW_ARGS(SkTable_ColorFilter, (table, table, table, table));
+}
+
+SkColorFilter* SkTableColorFilter::CreateARGB(const uint8_t tableA[256],
+ const uint8_t tableR[256],
+ const uint8_t tableG[256],
+ const uint8_t tableB[256]) {
+ return SkNEW_ARGS(SkTable_ColorFilter, (tableA, tableR, tableG, tableB));
+}