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/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkImageEncoder.h"
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkStream.h"
#include "SkTemplates.h"
class SkARGBImageEncoder : public SkImageEncoder {
protected:
bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) override;
private:
typedef SkImageEncoder INHERITED;
};
typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* argb, int width,
const SkPMColor* SK_RESTRICT ctable);
static void ARGB_8888_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
for (int i = 0; i < width; ++i) {
const uint32_t c = *src++;
argb[0] = SkGetPackedA32(c);
argb[1] = SkGetPackedR32(c);
argb[2] = SkGetPackedG32(c);
argb[3] = SkGetPackedB32(c);
argb += 4;
}
}
static void RGB_565_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
const uint16_t* SK_RESTRICT src = (const uint16_t*)in;
for (int i = 0; i < width; ++i) {
const uint16_t c = *src++;
argb[0] = 0xFF;
argb[1] = SkPacked16ToR32(c);
argb[2] = SkPacked16ToG32(c);
argb[3] = SkPacked16ToB32(c);
argb += 4;
}
}
static void ARGB_4444_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
for (int i = 0; i < width; ++i) {
const SkPMColor16 c = *src++;
argb[0] = SkPacked4444ToA32(c);
argb[1] = SkPacked4444ToR32(c);
argb[2] = SkPacked4444ToG32(c);
argb[3] = SkPacked4444ToB32(c);
argb += 4;
}
}
static void Index8_To_ARGB(const uint8_t* in, uint8_t* argb, int width,
const SkPMColor* SK_RESTRICT ctable) {
const uint8_t* SK_RESTRICT src = (const uint8_t*)in;
for (int i = 0; i < width; ++i) {
const uint32_t c = ctable[*src++];
argb[0] = SkGetPackedA32(c);
argb[1] = SkGetPackedR32(c);
argb[2] = SkGetPackedG32(c);
argb[3] = SkGetPackedB32(c);
argb += 4;
}
}
static ScanlineImporter ChooseImporter(SkColorType ct) {
switch (ct) {
case kN32_SkColorType:
return ARGB_8888_To_ARGB;
case kRGB_565_SkColorType:
return RGB_565_To_ARGB;
case kARGB_4444_SkColorType:
return ARGB_4444_To_ARGB;
case kIndex_8_SkColorType:
return Index8_To_ARGB;
default:
return NULL;
}
}
bool SkARGBImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap, int) {
const ScanlineImporter scanline_import = ChooseImporter(bitmap.colorType());
if (NULL == scanline_import) {
return false;
}
SkAutoLockPixels alp(bitmap);
const uint8_t* src = (uint8_t*)bitmap.getPixels();
if (NULL == bitmap.getPixels()) {
return false;
}
const SkPMColor* colors = bitmap.getColorTable() ? bitmap.getColorTable()->readColors() : NULL;
const int argbStride = bitmap.width() * 4;
SkAutoTDeleteArray<uint8_t> ada(new uint8_t[argbStride]);
uint8_t* argb = ada.get();
for (int y = 0; y < bitmap.height(); ++y) {
scanline_import(src + y * bitmap.rowBytes(), argb, bitmap.width(), colors);
stream->write(argb, argbStride);
}
return true;
}
///////////////////////////////////////////////////////////////////////////////
DEFINE_ENCODER_CREATOR(ARGBImageEncoder);
///////////////////////////////////////////////////////////////////////////////
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