diff options
Diffstat (limited to 'src/core/SkBlitRow_D4444.cpp')
| -rw-r--r-- | src/core/SkBlitRow_D4444.cpp | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/src/core/SkBlitRow_D4444.cpp b/src/core/SkBlitRow_D4444.cpp new file mode 100644 index 0000000..e60c721 --- /dev/null +++ b/src/core/SkBlitRow_D4444.cpp @@ -0,0 +1,214 @@ +#include "SkBlitRow.h" +#include "SkColorPriv.h" +#include "SkDither.h" + +/////////////////////////////////////////////////////////////////////////////// + +static void S32_D4444_Opaque(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + U8CPU alpha, int /*x*/, int /*y*/) { + SkASSERT(255 == alpha); + + if (count > 0) { + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + SkASSERT(SkGetPackedA32(c) == 255); + *dst++ = SkPixel32ToPixel4444(c); + } while (--count != 0); + } +} + +static void S32_D4444_Blend(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + U8CPU alpha, int /*x*/, int /*y*/) { + SkASSERT(255 > alpha); + + if (count > 0) { + unsigned scale16 = SkAlpha255To256(alpha) >> 4; + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + SkASSERT(SkGetPackedA32(c) == 255); + + uint32_t src_expand = SkExpand32_4444(c); + uint32_t dst_expand = SkExpand_4444(*dst); + dst_expand += (src_expand - dst_expand) * scale16 >> 4; + *dst++ = SkCompact_4444(dst_expand); + } while (--count != 0); + } +} + +static void S32A_D4444_Opaque(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + U8CPU alpha, int /*x*/, int /*y*/) { + SkASSERT(255 == alpha); + + if (count > 0) { + do { + SkPMColor c = *src++; + SkPMColorAssert(c); +// if (__builtin_expect(c!=0, 1)) + if (c) + { + unsigned scale16 = SkAlpha255To256(255 - SkGetPackedA32(c)) >> 4; + uint32_t src_expand = SkExpand_8888(c); + uint32_t dst_expand = SkExpand_4444(*dst) * scale16; + *dst = SkCompact_4444((src_expand + dst_expand) >> 4); + } + dst += 1; + } while (--count != 0); + } +} + +static void S32A_D4444_Blend(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, int count, + U8CPU alpha, int /*x*/, int /*y*/) { + SkASSERT(255 > alpha); + + if (count > 0) { + int src_scale = SkAlpha255To256(alpha) >> 4; + do { + SkPMColor sc = *src++; + SkPMColorAssert(sc); + + if (sc) { + unsigned dst_scale = 16 - (SkGetPackedA32(sc) * src_scale >> 8); + uint32_t src_expand = SkExpand32_4444(sc) * src_scale; + uint32_t dst_expand = SkExpand_4444(*dst) * dst_scale; + *dst = SkCompact_4444((src_expand + dst_expand) >> 4); + } + dst += 1; + } while (--count != 0); + } +} + +///////////////////////////////////////////////////////////////////////////// + +static void S32_D4444_Opaque_Dither(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, + int count, U8CPU alpha, int x, int y) { + SkASSERT(255 == alpha); + + if (count > 0) { + DITHER_4444_SCAN(y); + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + SkASSERT(SkGetPackedA32(c) == 255); + + unsigned dither = DITHER_VALUE(x); + *dst++ = SkDitherARGB32To4444(c, dither); + DITHER_INC_X(x); + } while (--count != 0); + } +} + +static void S32_D4444_Blend_Dither(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, + int count, U8CPU alpha, int x, int y) { + SkASSERT(255 > alpha); + + if (count > 0) { + int scale16 = SkAlpha255To256(alpha) >> 4; + DITHER_4444_SCAN(y); + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + SkASSERT(SkGetPackedA32(c) == 255); + + uint32_t src_expand = SkExpand32_4444(c) * scale16; + uint32_t dst_expand = SkExpand_4444(*dst) * (16 - scale16); + + c = SkCompact_8888(src_expand + dst_expand); // convert back to SkPMColor + *dst++ = SkDitherARGB32To4444(c, DITHER_VALUE(x)); + DITHER_INC_X(x); + } while (--count != 0); + } +} + +static void S32A_D4444_Opaque_Dither(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, + int count, U8CPU alpha, int x, int y) { + SkASSERT(255 == alpha); + + if (count > 0) { + DITHER_4444_SCAN(y); + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + if (c) { + unsigned a = SkGetPackedA32(c); + int d = SkAlphaMul(DITHER_VALUE(x), SkAlpha255To256(a)); + + unsigned scale16 = SkAlpha255To256(255 - a) >> 4; + uint32_t src_expand = SkExpand_8888(c); + uint32_t dst_expand = SkExpand_4444(*dst) * scale16; + // convert back to SkPMColor + c = SkCompact_8888(src_expand + dst_expand); + *dst = SkDitherARGB32To4444(c, d); + } + dst += 1; + DITHER_INC_X(x); + } while (--count != 0); + } +} + +// need DitherExpand888To4444(expand, dither) + +static void S32A_D4444_Blend_Dither(uint16_t* SK_RESTRICT dst, + const SkPMColor* SK_RESTRICT src, + int count, U8CPU alpha, int x, int y) { + SkASSERT(255 > alpha); + + if (count > 0) { + int src_scale = SkAlpha255To256(alpha) >> 4; + DITHER_4444_SCAN(y); + do { + SkPMColor c = *src++; + SkPMColorAssert(c); + if (c) { + unsigned a = SkAlpha255To256(SkGetPackedA32(c)); + int d = SkAlphaMul(DITHER_VALUE(x), a); + + unsigned dst_scale = 16 - SkAlphaMul(src_scale, a); + uint32_t src_expand = SkExpand32_4444(c) * src_scale; + uint32_t dst_expand = SkExpand_4444(*dst) * dst_scale; + // convert back to SkPMColor + c = SkCompact_8888(src_expand + dst_expand); + *dst = SkDitherARGB32To4444(c, d); + } + dst += 1; + DITHER_INC_X(x); + } while (--count != 0); + } +} + +/////////////////////////////////////////////////////////////////////////////// +/////////////////////////////////////////////////////////////////////////////// + +static const SkBlitRow::Proc gProcs4444[] = { + // no dither + S32_D4444_Opaque, + S32_D4444_Blend, + + S32A_D4444_Opaque, + S32A_D4444_Blend, + + // dither + S32_D4444_Opaque_Dither, + S32_D4444_Blend_Dither, + + S32A_D4444_Opaque_Dither, + S32A_D4444_Blend_Dither +}; + +SkBlitRow::Proc SkBlitRow_Factory_4444(unsigned flags); +SkBlitRow::Proc SkBlitRow_Factory_4444(unsigned flags) +{ + SkASSERT(flags < SK_ARRAY_COUNT(gProcs4444)); + + return gProcs4444[flags]; +} + + |