/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkColorData.h"
#include "SkColorSpacePriv.h"
#include "SkColorSpaceXformSteps.h"
#include "SkConvertPixels.h"
#include "SkHalf.h"
#include "SkImageInfoPriv.h"
#include "SkOpts.h"
#include "SkRasterPipeline.h"
static bool rect_memcpy(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
const SkColorSpaceXformSteps& steps) {
// We can copy the pixels when no color type, alpha type, or color space changes.
if (dstInfo.colorType() != srcInfo.colorType()) {
return false;
}
if (dstInfo.colorType() != kAlpha_8_SkColorType
&& steps.flags.mask() != 0b00000) {
return false;
}
SkRectMemcpy(dstPixels, dstRB,
srcPixels, srcRB, dstInfo.minRowBytes(), dstInfo.height());
return true;
}
static bool swizzle_or_premul(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB,
const SkColorSpaceXformSteps& steps) {
auto is_8888 = [](SkColorType ct) {
return ct == kRGBA_8888_SkColorType || ct == kBGRA_8888_SkColorType;
};
if (!is_8888(dstInfo.colorType()) ||
!is_8888(srcInfo.colorType()) ||
steps.flags.linearize ||
steps.flags.gamut_transform ||
steps.flags.unpremul ||
steps.flags.encode) {
return false;
}
const bool swapRB = dstInfo.colorType() != srcInfo.colorType();
void (*fn)(uint32_t*, const uint32_t*, int) = nullptr;
if (steps.flags.premul) {
fn = swapRB ? SkOpts::RGBA_to_bgrA
: SkOpts::RGBA_to_rgbA;
} else {
// If we're not swizzling, we ought to have used rect_memcpy().
SkASSERT(swapRB);
fn = SkOpts::RGBA_to_BGRA;
}
for (int y = 0; y < dstInfo.height(); y++) {
fn((uint32_t*)dstPixels, (const uint32_t*)srcPixels, dstInfo.width());
dstPixels = SkTAddOffset<void>(dstPixels, dstRB);
srcPixels = SkTAddOffset<const void>(srcPixels, srcRB);
}
return true;
}
static bool convert_to_alpha8(const SkImageInfo& dstInfo, void* vdst, size_t dstRB,
const SkImageInfo& srcInfo, const void* src, size_t srcRB,
const SkColorSpaceXformSteps&) {
if (dstInfo.colorType() != kAlpha_8_SkColorType) {
return false;
}
auto dst = (uint8_t*)vdst;
switch (srcInfo.colorType()) {
case kUnknown_SkColorType:
case kAlpha_8_SkColorType: {
// Unknown should never happen.
// Alpha8 should have been handled by rect_memcpy().
SkASSERT(false);
return false;
}
case kGray_8_SkColorType:
case kRGB_565_SkColorType:
case kRGB_888x_SkColorType:
case kRGB_101010x_SkColorType: {
for (int y = 0; y < srcInfo.height(); ++y) {
memset(dst, 0xFF, srcInfo.width());
dst = SkTAddOffset<uint8_t>(dst, dstRB);
}
return true;
}
case kARGB_4444_SkColorType: {
auto src16 = (const uint16_t*) src;
for (int y = 0; y < srcInfo.height(); y++) {
for (int x = 0; x < srcInfo.width(); x++) {
dst[x] = SkPacked4444ToA32(src16[x]);
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
src16 = SkTAddOffset<const uint16_t>(src16, srcRB);
}
return true;
}
case kBGRA_8888_SkColorType:
case kRGBA_8888_SkColorType: {
auto src32 = (const uint32_t*) src;
for (int y = 0; y < srcInfo.height(); y++) {
for (int x = 0; x < srcInfo.width(); x++) {
dst[x] = src32[x] >> 24;
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
}
return true;
}
case kRGBA_1010102_SkColorType: {
auto src32 = (const uint32_t*) src;
for (int y = 0; y < srcInfo.height(); y++) {
for (int x = 0; x < srcInfo.width(); x++) {
dst[x] = (src32[x] >> 30) * 0x55;
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
src32 = SkTAddOffset<const uint32_t>(src32, srcRB);
}
return true;
}
case kRGBA_F16_SkColorType: {
auto src64 = (const uint64_t*) src;
for (int y = 0; y < srcInfo.height(); y++) {
for (int x = 0; x < srcInfo.width(); x++) {
dst[x] = (uint8_t) (255.0f * SkHalfToFloat(src64[x] >> 48));
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
src64 = SkTAddOffset<const uint64_t>(src64, srcRB);
}
return true;
}
case kRGBA_F32_SkColorType: {
auto rgba = (const float*)src;
for (int y = 0; y < srcInfo.height(); y++) {
for (int x = 0; x < srcInfo.width(); x++) {
dst[x] = (uint8_t)(255.0f * rgba[4*x+3]);
}
dst = SkTAddOffset<uint8_t>(dst, dstRB);
rgba = SkTAddOffset<const float>(rgba, srcRB);
}
return true;
}
}
return false;
}
// Default: Use the pipeline.
static void convert_with_pipeline(const SkImageInfo& dstInfo, void* dstRow, size_t dstRB,
const SkImageInfo& srcInfo, const void* srcRow, size_t srcRB,
const SkColorSpaceXformSteps& steps) {
SkRasterPipeline_MemoryCtx src = { (void*)srcRow, (int)(srcRB / srcInfo.bytesPerPixel()) },
dst = { (void*)dstRow, (int)(dstRB / dstInfo.bytesPerPixel()) };
SkRasterPipeline_<256> pipeline;
pipeline.append_load(srcInfo.colorType(), &src);
steps.apply(&pipeline, srcInfo.colorType());
pipeline.append_gamut_clamp_if_normalized(dstInfo);
// We'll dither if we're decreasing precision below 32-bit.
float dither_rate = 0.0f;
if (srcInfo.bytesPerPixel() > dstInfo.bytesPerPixel()) {
switch (dstInfo.colorType()) {
case kRGB_565_SkColorType: dither_rate = 1/63.0f; break;
case kARGB_4444_SkColorType: dither_rate = 1/15.0f; break;
default: dither_rate = 0.0f; break;
}
}
if (dither_rate > 0) {
pipeline.append(SkRasterPipeline::dither, &dither_rate);
}
pipeline.append_store(dstInfo.colorType(), &dst);
pipeline.run(0,0, srcInfo.width(), srcInfo.height());
}
void SkConvertPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRB,
const SkImageInfo& srcInfo, const void* srcPixels, size_t srcRB) {
SkASSERT(dstInfo.dimensions() == srcInfo.dimensions());
SkASSERT(SkImageInfoValidConversion(dstInfo, srcInfo));
SkColorSpaceXformSteps steps{srcInfo.colorSpace(), srcInfo.alphaType(),
dstInfo.colorSpace(), dstInfo.alphaType()};
for (auto fn : {rect_memcpy, swizzle_or_premul, convert_to_alpha8}) {
if (fn(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps)) {
return;
}
}
convert_with_pipeline(dstInfo, dstPixels, dstRB, srcInfo, srcPixels, srcRB, steps);
}