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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 "SkCanvas.h"
#include "SkColorPriv.h"
namespace {
/**
Copies all pixels from a bitmap to a dst ptr with a given rowBytes and
Config8888. The bitmap must have kARGB_8888_Config.
*/
inline void SkCopyBitmapToConfig8888(uint32_t* dstPixels,
size_t dstRowBytes,
SkCanvas::Config8888 dstConfig8888,
const SkBitmap& srcBmp);
/**
* Copies all pixels in a bitmap to a dst ptr with row bytes. The src bitmap
* is assumed to have pixels and be kARGB_8888_Config. No conversion is applied
*/
inline void SkCopyARGB8888BitmapTo(uint32_t* dstPixels,
size_t dstRowBytes,
const SkBitmap& srcBmp);
/**
Copies over all pixels in a bitmap from a src ptr with a given rowBytes and
Config8888. The bitmap must have pixels and be kARGB_8888_Config.
*/
inline void SkCopyConfig8888ToBitmap(const SkBitmap& dstBmp,
const uint32_t* srcPixels,
size_t srcRowBytes,
SkCanvas::Config8888 srcConfig8888);
}
///////////////////////////////////////////////////////////////////////////////
// Implementation
namespace {
template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline uint32_t pack_config8888(uint32_t a, uint32_t r,
uint32_t g, uint32_t b) {
#ifdef SK_CPU_LENDIAN
return (a << (A_IDX * 8)) | (r << (R_IDX * 8)) |
(g << (G_IDX * 8)) | (b << (B_IDX * 8));
#else
return (a << ((3-A_IDX) * 8)) | (r << ((3-R_IDX) * 8)) |
(g << ((3-G_IDX) * 8)) | (b << ((3-B_IDX) * 8));
#endif
}
template <int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline void unpack_config8888(uint32_t color,
uint32_t* a, uint32_t* r,
uint32_t* g, uint32_t* b) {
#ifdef SK_CPU_LENDIAN
*a = (color >> (A_IDX * 8)) & 0xff;
*r = (color >> (R_IDX * 8)) & 0xff;
*g = (color >> (G_IDX * 8)) & 0xff;
*b = (color >> (B_IDX * 8)) & 0xff;
#else
*a = (color >> ((3 - A_IDX) * 8)) & 0xff;
*r = (color >> ((3 - R_IDX) * 8)) & 0xff;
*g = (color >> ((3 - G_IDX) * 8)) & 0xff;
*b = (color >> ((3 - B_IDX) * 8)) & 0xff;
#endif
}
template <bool UNPM, int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline void bitmap_copy_to_config8888(uint32_t* dstPixels,
size_t dstRowBytes,
const SkBitmap& srcBmp) {
SkASSERT(SkBitmap::kARGB_8888_Config == srcBmp.config());
SkAutoLockPixels alp(srcBmp);
int w = srcBmp.width();
int h = srcBmp.height();
size_t srcRowBytes = srcBmp.rowBytes();
intptr_t src = reinterpret_cast<intptr_t>(srcBmp.getPixels());
intptr_t dst = reinterpret_cast<intptr_t>(dstPixels);
for (int y = 0; y < h; ++y) {
const SkPMColor* srcRow = reinterpret_cast<SkPMColor*>(src);
uint32_t* dstRow = reinterpret_cast<uint32_t*>(dst);
for (int x = 0; x < w; ++x) {
SkPMColor pmcolor = srcRow[x];
if (UNPM) {
U8CPU a, r, g, b;
a = SkGetPackedA32(pmcolor);
if (a) {
// We're doing the explicit divide to match WebKit layout
// test expectations. We can modify and rebaseline if there
// it can be shown that there is a more performant way to
// unpremul.
r = SkGetPackedR32(pmcolor) * 0xff / a;
g = SkGetPackedG32(pmcolor) * 0xff / a;
b = SkGetPackedB32(pmcolor) * 0xff / a;
dstRow[x] = pack_config8888<A_IDX, R_IDX,
G_IDX, B_IDX>(a, r, g, b);
} else {
dstRow[x] = 0;
}
} else {
dstRow[x] = pack_config8888<A_IDX, R_IDX,
G_IDX, B_IDX>(
SkGetPackedA32(pmcolor),
SkGetPackedR32(pmcolor),
SkGetPackedG32(pmcolor),
SkGetPackedB32(pmcolor));
}
}
dst += dstRowBytes;
src += srcRowBytes;
}
}
template <bool PM, int A_IDX, int R_IDX, int G_IDX, int B_IDX>
inline void config8888_copy_to_bitmap(const SkBitmap& dstBmp,
const uint32_t* srcPixels,
size_t srcRowBytes) {
SkASSERT(SkBitmap::kARGB_8888_Config == dstBmp.config());
SkAutoLockPixels alp(dstBmp);
int w = dstBmp.width();
int h = dstBmp.height();
size_t dstRowBytes = dstBmp.rowBytes();
intptr_t src = reinterpret_cast<intptr_t>(srcPixels);
intptr_t dst = reinterpret_cast<intptr_t>(dstBmp.getPixels());
for (int y = 0; y < h; ++y) {
const uint32_t* srcRow = reinterpret_cast<uint32_t*>(src);
SkPMColor* dstRow = reinterpret_cast<SkPMColor*>(dst);
for (int x = 0; x < w; ++x) {
uint32_t c8888 = srcRow[x];
uint32_t a, r, g, b;
unpack_config8888<A_IDX, R_IDX, G_IDX, B_IDX>(c8888, &a, &r,
&g, &b);
if (PM) {
// This matches WebKit's conversion which we are replacing.
// We can consider alternative rounding rules for performance.
r = SkMulDiv255Ceiling(r, a);
g = SkMulDiv255Ceiling(g, a);
b = SkMulDiv255Ceiling(b, a);
}
// NoCheck: https://bugs.webkit.org/show_bug.cgi?id=74025
dstRow[x] = SkPackARGB32NoCheck(a, r, g, b);
}
src += srcRowBytes;
dst += dstRowBytes;
}
}
#ifdef SK_CPU_LENDIAN
static const int SK_NATIVE_A_IDX = SK_A32_SHIFT / 8;
static const int SK_NATIVE_R_IDX = SK_R32_SHIFT / 8;
static const int SK_NATIVE_G_IDX = SK_G32_SHIFT / 8;
static const int SK_NATIVE_B_IDX = SK_B32_SHIFT / 8;
#else
static const int SK_NATIVE_A_IDX = 3 - (SK_A32_SHIFT / 8);
static const int SK_NATIVE_R_IDX = 3 - (SK_R32_SHIFT / 8);
static const int SK_NATIVE_G_IDX = 3 - (SK_G32_SHIFT / 8);
static const int SK_NATIVE_B_IDX = 3 - (SK_B32_SHIFT / 8);
#endif
inline void SkCopyBitmapToConfig8888(uint32_t* dstPixels,
size_t dstRowBytes,
SkCanvas::Config8888 dstConfig8888,
const SkBitmap& srcBmp) {
switch (dstConfig8888) {
case SkCanvas::kNative_Premul_Config8888:
bitmap_copy_to_config8888<false,
SK_NATIVE_A_IDX, SK_NATIVE_R_IDX,
SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(
dstPixels,
dstRowBytes,
srcBmp);
break;
case SkCanvas::kNative_Unpremul_Config8888:
bitmap_copy_to_config8888<true,
SK_NATIVE_A_IDX, SK_NATIVE_R_IDX,
SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(
dstPixels,
dstRowBytes,
srcBmp);
break;
case SkCanvas::kBGRA_Premul_Config8888:
bitmap_copy_to_config8888<false, 3, 2, 1, 0> (
dstPixels, dstRowBytes, srcBmp);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
bitmap_copy_to_config8888<true, 3, 2, 1, 0> (
dstPixels, dstRowBytes, srcBmp);
break;
case SkCanvas::kRGBA_Premul_Config8888:
bitmap_copy_to_config8888<false, 3, 0, 1, 2> (
dstPixels, dstRowBytes, srcBmp);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
bitmap_copy_to_config8888<true, 3, 0, 1, 2> (
dstPixels, dstRowBytes, srcBmp);
break;
default:
SkDEBUGFAIL("unexpected Config8888");
break;
}
}
inline void SkCopyConfig8888ToBitmap(const SkBitmap& dstBmp,
const uint32_t* srcPixels,
size_t srcRowBytes,
SkCanvas::Config8888 srcConfig8888) {
switch (srcConfig8888) {
case SkCanvas::kNative_Premul_Config8888:
config8888_copy_to_bitmap<false,
SK_NATIVE_A_IDX, SK_NATIVE_R_IDX,
SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(
dstBmp,
srcPixels,
srcRowBytes);
break;
case SkCanvas::kNative_Unpremul_Config8888:
config8888_copy_to_bitmap<true,
SK_NATIVE_A_IDX, SK_NATIVE_R_IDX,
SK_NATIVE_G_IDX, SK_NATIVE_B_IDX>(
dstBmp,
srcPixels,
srcRowBytes);
break;
case SkCanvas::kBGRA_Premul_Config8888:
config8888_copy_to_bitmap<false, 3, 2, 1, 0> (
dstBmp, srcPixels, srcRowBytes);
break;
case SkCanvas::kBGRA_Unpremul_Config8888:
config8888_copy_to_bitmap<true, 3, 2, 1, 0> (
dstBmp, srcPixels, srcRowBytes);
break;
case SkCanvas::kRGBA_Premul_Config8888:
config8888_copy_to_bitmap<false, 3, 0, 1, 2> (
dstBmp, srcPixels, srcRowBytes);
break;
case SkCanvas::kRGBA_Unpremul_Config8888:
config8888_copy_to_bitmap<true, 3, 0, 1, 2> (
dstBmp, srcPixels, srcRowBytes);
break;
default:
SkDEBUGFAIL("unexpected Config8888");
break;
}
}
inline void SkCopyARGB8888BitmapTo(uint32_t* dstPixels,
size_t dstRowBytes,
const SkBitmap& srcBmp) {
SkASSERT(SkBitmap::kARGB_8888_Config == srcBmp.config());
SkAutoLockPixels alp(srcBmp);
int w = srcBmp.width();
int h = srcBmp.height();
size_t srcRowBytes = srcBmp.rowBytes();
size_t tightRowBytes = w * 4;
char* src = reinterpret_cast<char*>(srcBmp.getPixels());
char* dst = reinterpret_cast<char*>(dstPixels);
if (tightRowBytes == srcRowBytes &&
tightRowBytes == dstRowBytes) {
memcpy(dst, src, tightRowBytes * h);
} else {
for (int y = 0; y < h; ++y) {
memcpy(dst, src, tightRowBytes);
dst += dstRowBytes;
src += srcRowBytes;
}
}
}
}
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