1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/images/SkImageEncoder_argb.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,119 @@
1.4 +/*
1.5 + * Copyright 2013 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#include "SkImageEncoder.h"
1.12 +#include "SkBitmap.h"
1.13 +#include "SkColorPriv.h"
1.14 +#include "SkStream.h"
1.15 +#include "SkTemplates.h"
1.16 +
1.17 +class SkARGBImageEncoder : public SkImageEncoder {
1.18 +protected:
1.19 + virtual bool onEncode(SkWStream* stream, const SkBitmap& bm, int quality) SK_OVERRIDE;
1.20 +
1.21 +private:
1.22 + typedef SkImageEncoder INHERITED;
1.23 +};
1.24 +
1.25 +typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* argb, int width,
1.26 + const SkPMColor* SK_RESTRICT ctable);
1.27 +
1.28 +static void ARGB_8888_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
1.29 + const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
1.30 + for (int i = 0; i < width; ++i) {
1.31 + const uint32_t c = *src++;
1.32 + argb[0] = SkGetPackedA32(c);
1.33 + argb[1] = SkGetPackedR32(c);
1.34 + argb[2] = SkGetPackedG32(c);
1.35 + argb[3] = SkGetPackedB32(c);
1.36 + argb += 4;
1.37 + }
1.38 +}
1.39 +
1.40 +static void RGB_565_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
1.41 + const uint16_t* SK_RESTRICT src = (const uint16_t*)in;
1.42 + for (int i = 0; i < width; ++i) {
1.43 + const uint16_t c = *src++;
1.44 + argb[0] = 0xFF;
1.45 + argb[1] = SkPacked16ToR32(c);
1.46 + argb[2] = SkPacked16ToG32(c);
1.47 + argb[3] = SkPacked16ToB32(c);
1.48 + argb += 4;
1.49 + }
1.50 +}
1.51 +
1.52 +static void ARGB_4444_To_ARGB(const uint8_t* in, uint8_t* argb, int width, const SkPMColor*) {
1.53 + const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
1.54 + for (int i = 0; i < width; ++i) {
1.55 + const SkPMColor16 c = *src++;
1.56 + argb[0] = SkPacked4444ToA32(c);
1.57 + argb[1] = SkPacked4444ToR32(c);
1.58 + argb[2] = SkPacked4444ToG32(c);
1.59 + argb[3] = SkPacked4444ToB32(c);
1.60 + argb += 4;
1.61 + }
1.62 +}
1.63 +
1.64 +static void Index8_To_ARGB(const uint8_t* in, uint8_t* argb, int width,
1.65 + const SkPMColor* SK_RESTRICT ctable) {
1.66 + const uint8_t* SK_RESTRICT src = (const uint8_t*)in;
1.67 + for (int i = 0; i < width; ++i) {
1.68 + const uint32_t c = ctable[*src++];
1.69 + argb[0] = SkGetPackedA32(c);
1.70 + argb[1] = SkGetPackedR32(c);
1.71 + argb[2] = SkGetPackedG32(c);
1.72 + argb[3] = SkGetPackedB32(c);
1.73 + argb += 4;
1.74 + }
1.75 +}
1.76 +
1.77 +static ScanlineImporter ChooseImporter(const SkBitmap::Config& config) {
1.78 + switch (config) {
1.79 + case SkBitmap::kARGB_8888_Config:
1.80 + return ARGB_8888_To_ARGB;
1.81 + case SkBitmap::kRGB_565_Config:
1.82 + return RGB_565_To_ARGB;
1.83 + case SkBitmap::kARGB_4444_Config:
1.84 + return ARGB_4444_To_ARGB;
1.85 + case SkBitmap::kIndex8_Config:
1.86 + return Index8_To_ARGB;
1.87 + default:
1.88 + return NULL;
1.89 + }
1.90 +}
1.91 +
1.92 +bool SkARGBImageEncoder::onEncode(SkWStream* stream, const SkBitmap& bitmap, int) {
1.93 + const SkBitmap::Config config = bitmap.config();
1.94 + const ScanlineImporter scanline_import = ChooseImporter(config);
1.95 + if (NULL == scanline_import) {
1.96 + return false;
1.97 + }
1.98 +
1.99 + SkAutoLockPixels alp(bitmap);
1.100 + const uint8_t* src = (uint8_t*)bitmap.getPixels();
1.101 + if (NULL == bitmap.getPixels()) {
1.102 + return false;
1.103 + }
1.104 +
1.105 + SkAutoLockColors ctLocker;
1.106 + const SkPMColor* colors = ctLocker.lockColors(bitmap);
1.107 +
1.108 + const int argbStride = bitmap.width() * 4;
1.109 + SkAutoTDeleteArray<uint8_t> ada(new uint8_t[argbStride]);
1.110 + uint8_t* argb = ada.get();
1.111 + for (int y = 0; y < bitmap.height(); ++y) {
1.112 + scanline_import(src + y * bitmap.rowBytes(), argb, bitmap.width(), colors);
1.113 + stream->write(argb, argbStride);
1.114 + }
1.115 +
1.116 + return true;
1.117 +}
1.118 +
1.119 +
1.120 +///////////////////////////////////////////////////////////////////////////////
1.121 +DEFINE_ENCODER_CREATOR(ARGBImageEncoder);
1.122 +///////////////////////////////////////////////////////////////////////////////
