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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;
unsigned dst_scale = 255 - SkMulDiv255Round(SkGetPackedA32(sc), alpha);
unsigned dr = SkMulS16(SkPacked32ToR16(sc), alpha) + SkMulS16(SkGetPackedR16(dc), dst_scale);
unsigned dg = SkMulS16(SkPacked32ToG16(sc), alpha) + SkMulS16(SkGetPackedG16(dc), dst_scale);
unsigned db = SkMulS16(SkPacked32ToB16(sc), alpha) + SkMulS16(SkGetPackedB16(dc), dst_scale);
*dst = SkPackRGB16(SkDiv255Round(dr), SkDiv255Round(dg), SkDiv255Round(db));
}
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 = SkAlpha255To256(255 - SkAlphaMul(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 const SkBlitRow::Proc 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::Proc SkBlitRow::Factory(unsigned flags, SkBitmap::Config config) {
SkASSERT(flags < SK_ARRAY_COUNT(gDefault_565_Procs));
// just so we don't crash
flags &= kFlags16_Mask;
SkBlitRow::Proc proc = NULL;
switch (config) {
case SkBitmap::kRGB_565_Config:
proc = PlatformProcs565(flags);
if (NULL == proc) {
proc = gDefault_565_Procs[flags];
}
break;
default:
break;
}
return proc;
}
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