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/*
* Copyright 2011 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkBlitRow.h"
#include "SkColorPriv.h"
#include "SkDither.h"
#include "SkMathPriv.h"
///////////////////////////////////////////////////////////////////////////////
static void S32_D565_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);
*dst++ = SkPixel32ToPixel16_ToU16(c);
} while (--count != 0);
}
}
static void S32_D565_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 scale = SkAlpha255To256(alpha);
do {
SkPMColor c = *src++;
SkPMColorAssert(c);
uint16_t d = *dst;
*dst++ = SkPackRGB16(
SkAlphaBlend(SkPacked32ToR16(c), SkGetPackedR16(d), scale),
SkAlphaBlend(SkPacked32ToG16(c), SkGetPackedG16(d), scale),
SkAlphaBlend(SkPacked32ToB16(c), SkGetPackedB16(d), scale));
} while (--count != 0);
}
}
static void S32A_D565_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) {
*dst = SkSrcOver32To16(c, *dst);
}
dst += 1;
} while (--count != 0);
}
}
static void S32A_D565_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) {
do {
SkPMColor sc = *src++;
SkPMColorAssert(sc);
if (sc) {
uint16_t dc = *dst;
SkPMColor res = SkBlendARGB32(sc, SkPixel16ToPixel32(dc), alpha);
*dst = SkPixel32ToPixel16(res);
}
dst += 1;
} while (--count != 0);
}
}
/////////////////////////////////////////////////////////////////////////////
static void S32_D565_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_565_SCAN(y);
do {
SkPMColor c = *src++;
SkPMColorAssert(c);
unsigned dither = DITHER_VALUE(x);
*dst++ = SkDitherRGB32To565(c, dither);
DITHER_INC_X(x);
} while (--count != 0);
}
}
static void S32_D565_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 scale = SkAlpha255To256(alpha);
DITHER_565_SCAN(y);
do {
SkPMColor c = *src++;
SkPMColorAssert(c);
int dither = DITHER_VALUE(x);
int sr = SkGetPackedR32(c);
int sg = SkGetPackedG32(c);
int sb = SkGetPackedB32(c);
sr = SkDITHER_R32To565(sr, dither);
sg = SkDITHER_G32To565(sg, dither);
sb = SkDITHER_B32To565(sb, dither);
uint16_t d = *dst;
*dst++ = SkPackRGB16(SkAlphaBlend(sr, SkGetPackedR16(d), scale),
SkAlphaBlend(sg, SkGetPackedG16(d), scale),
SkAlphaBlend(sb, SkGetPackedB16(d), scale));
DITHER_INC_X(x);
} while (--count != 0);
}
}
static void S32A_D565_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_565_SCAN(y);
do {
SkPMColor c = *src++;
SkPMColorAssert(c);
if (c) {
unsigned a = SkGetPackedA32(c);
int d = SkAlphaMul(DITHER_VALUE(x), SkAlpha255To256(a));
unsigned sr = SkGetPackedR32(c);
unsigned sg = SkGetPackedG32(c);
unsigned sb = SkGetPackedB32(c);
sr = SkDITHER_R32_FOR_565(sr, d);
sg = SkDITHER_G32_FOR_565(sg, d);
sb = SkDITHER_B32_FOR_565(sb, d);
uint32_t src_expanded = (sg << 24) | (sr << 13) | (sb << 2);
uint32_t dst_expanded = SkExpand_rgb_16(*dst);
dst_expanded = dst_expanded * (SkAlpha255To256(255 - a) >> 3);
// now src and dst expanded are in g:11 r:10 x:1 b:10
*dst = SkCompact_rgb_16((src_expanded + dst_expanded) >> 5);
}
dst += 1;
DITHER_INC_X(x);
} while (--count != 0);
}
}
static void S32A_D565_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);
DITHER_565_SCAN(y);
do {
SkPMColor c = *src++;
SkPMColorAssert(c);
if (c)
{
unsigned d = *dst;
int sa = SkGetPackedA32(c);
int dst_scale = SkAlphaMulInv256(sa, src_scale);
int dither = DITHER_VALUE(x);
int sr = SkGetPackedR32(c);
int sg = SkGetPackedG32(c);
int sb = SkGetPackedB32(c);
sr = SkDITHER_R32To565(sr, dither);
sg = SkDITHER_G32To565(sg, dither);
sb = SkDITHER_B32To565(sb, dither);
int dr = (sr * src_scale + SkGetPackedR16(d) * dst_scale) >> 8;
int dg = (sg * src_scale + SkGetPackedG16(d) * dst_scale) >> 8;
int db = (sb * src_scale + SkGetPackedB16(d) * dst_scale) >> 8;
*dst = SkPackRGB16(dr, dg, db);
}
dst += 1;
DITHER_INC_X(x);
} while (--count != 0);
}
}
///////////////////////////////////////////////////////////////////////////////
static uint32_t pmcolor_to_expand16(SkPMColor c) {
unsigned r = SkGetPackedR32(c);
unsigned g = SkGetPackedG32(c);
unsigned b = SkGetPackedB32(c);
return (g << 24) | (r << 13) | (b << 2);
}
static void Color32A_D565(uint16_t dst[], SkPMColor src, int count, int x, int y) {
SkASSERT(count > 0);
uint32_t src_expand = pmcolor_to_expand16(src);
unsigned scale = SkAlpha255To256(0xFF - SkGetPackedA32(src)) >> 3;
do {
*dst = SkBlend32_RGB16(src_expand, *dst, scale);
dst += 1;
} while (--count != 0);
}
///////////////////////////////////////////////////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
static const SkBlitRow::Proc16 gDefault_565_Procs[] = {
// no dither
S32_D565_Opaque,
S32_D565_Blend,
S32A_D565_Opaque,
S32A_D565_Blend,
// dither
S32_D565_Opaque_Dither,
S32_D565_Blend_Dither,
S32A_D565_Opaque_Dither,
S32A_D565_Blend_Dither
};
SkBlitRow::Proc16 SkBlitRow::Factory16(unsigned flags) {
SkASSERT(flags < SK_ARRAY_COUNT(gDefault_565_Procs));
// just so we don't crash
flags &= kFlags16_Mask;
return gDefault_565_Procs[flags];
}
static const SkBlitRow::ColorProc16 gDefault_565_ColorProcs[] = {
#if 0
Color32A_D565,
Color32A_D565_Dither
#else
// TODO: stop cheating and fill dither from the above specializations!
Color32A_D565,
Color32A_D565,
#endif
};
SkBlitRow::ColorProc16 SkBlitRow::ColorFactory16(unsigned flags) {
SkASSERT((flags & ~kFlags16_Mask) == 0);
// just so we don't crash
flags &= kFlags16_Mask;
// we ignore both kGlobalAlpha_Flag and kSrcPixelAlpha_Flag, so shift down
// no need for the additional code specializing on opaque alpha at this time
flags >>= 2;
SkASSERT(flags < SK_ARRAY_COUNT(gDefault_565_ColorProcs));
return gDefault_565_ColorProcs[flags];
}
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