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/*
* Copyright 2010, The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "SkImageEncoderPriv.h"
#ifdef SK_HAS_WEBP_LIBRARY
#include "SkBitmap.h"
#include "SkColorPriv.h"
#include "SkStream.h"
#include "SkTemplates.h"
#include "SkUnPreMultiply.h"
#include "SkUtils.h"
// A WebP decoder only, on top of (subset of) libwebp
// For more information on WebP image format, and libwebp library, see:
// http://code.google.com/speed/webp/
// http://www.webmproject.org/code/#libwebp_webp_image_decoder_library
// http://review.webmproject.org/gitweb?p=libwebp.git
#include <stdio.h>
extern "C" {
// If moving libwebp out of skia source tree, path for webp headers must be
// updated accordingly. Here, we enforce using local copy in webp sub-directory.
#include "webp/encode.h"
}
typedef void (*ScanlineImporter)(const uint8_t* in, uint8_t* out, int width,
const SkPMColor* SK_RESTRICT ctable);
static void ARGB_8888_To_RGB(const uint8_t* in, uint8_t* rgb, 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++;
rgb[0] = SkGetPackedR32(c);
rgb[1] = SkGetPackedG32(c);
rgb[2] = SkGetPackedB32(c);
rgb += 3;
}
}
static void ARGB_8888_To_RGBA(const uint8_t* in, uint8_t* rgb, int width,
const SkPMColor*) {
const uint32_t* SK_RESTRICT src = (const uint32_t*)in;
const SkUnPreMultiply::Scale* SK_RESTRICT table =
SkUnPreMultiply::GetScaleTable();
for (int i = 0; i < width; ++i) {
const uint32_t c = *src++;
uint8_t a = SkGetPackedA32(c);
uint8_t r = SkGetPackedR32(c);
uint8_t g = SkGetPackedG32(c);
uint8_t b = SkGetPackedB32(c);
if (0 != a && 255 != a) {
SkUnPreMultiply::Scale scale = table[a];
r = SkUnPreMultiply::ApplyScale(scale, r);
g = SkUnPreMultiply::ApplyScale(scale, g);
b = SkUnPreMultiply::ApplyScale(scale, b);
}
rgb[0] = r;
rgb[1] = g;
rgb[2] = b;
rgb[3] = a;
rgb += 4;
}
}
static void RGB_565_To_RGB(const uint8_t* in, uint8_t* rgb, 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++;
rgb[0] = SkPacked16ToR32(c);
rgb[1] = SkPacked16ToG32(c);
rgb[2] = SkPacked16ToB32(c);
rgb += 3;
}
}
static void ARGB_4444_To_RGB(const uint8_t* in, uint8_t* rgb, int width,
const SkPMColor*) {
const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
for (int i = 0; i < width; ++i) {
const SkPMColor16 c = *src++;
rgb[0] = SkPacked4444ToR32(c);
rgb[1] = SkPacked4444ToG32(c);
rgb[2] = SkPacked4444ToB32(c);
rgb += 3;
}
}
static void ARGB_4444_To_RGBA(const uint8_t* in, uint8_t* rgb, int width,
const SkPMColor*) {
const SkPMColor16* SK_RESTRICT src = (const SkPMColor16*)in;
const SkUnPreMultiply::Scale* SK_RESTRICT table =
SkUnPreMultiply::GetScaleTable();
for (int i = 0; i < width; ++i) {
const SkPMColor16 c = *src++;
uint8_t a = SkPacked4444ToA32(c);
uint8_t r = SkPacked4444ToR32(c);
uint8_t g = SkPacked4444ToG32(c);
uint8_t b = SkPacked4444ToB32(c);
if (0 != a && 255 != a) {
SkUnPreMultiply::Scale scale = table[a];
r = SkUnPreMultiply::ApplyScale(scale, r);
g = SkUnPreMultiply::ApplyScale(scale, g);
b = SkUnPreMultiply::ApplyScale(scale, b);
}
rgb[0] = r;
rgb[1] = g;
rgb[2] = b;
rgb[3] = a;
rgb += 4;
}
}
static void Index8_To_RGB(const uint8_t* in, uint8_t* rgb, 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++];
rgb[0] = SkGetPackedR32(c);
rgb[1] = SkGetPackedG32(c);
rgb[2] = SkGetPackedB32(c);
rgb += 3;
}
}
static ScanlineImporter ChooseImporter(SkColorType ct, bool hasAlpha, int* bpp) {
switch (ct) {
case kN32_SkColorType:
if (hasAlpha) {
*bpp = 4;
return ARGB_8888_To_RGBA;
} else {
*bpp = 3;
return ARGB_8888_To_RGB;
}
case kARGB_4444_SkColorType:
if (hasAlpha) {
*bpp = 4;
return ARGB_4444_To_RGBA;
} else {
*bpp = 3;
return ARGB_4444_To_RGB;
}
case kRGB_565_SkColorType:
*bpp = 3;
return RGB_565_To_RGB;
case kIndex_8_SkColorType:
*bpp = 3;
return Index8_To_RGB;
default:
return nullptr;
}
}
static int stream_writer(const uint8_t* data, size_t data_size,
const WebPPicture* const picture) {
SkWStream* const stream = (SkWStream*)picture->custom_ptr;
return stream->write(data, data_size) ? 1 : 0;
}
bool SkEncodeImageAsWEBP(SkWStream* stream, const SkPixmap& pixmap, int quality) {
const bool hasAlpha = !pixmap.isOpaque();
int bpp = -1;
const ScanlineImporter scanline_import = ChooseImporter(pixmap.colorType(), hasAlpha, &bpp);
if (nullptr == scanline_import) {
return false;
}
if (-1 == bpp) {
return false;
}
if (nullptr == pixmap.addr()) {
return false;
}
WebPConfig webp_config;
if (!WebPConfigPreset(&webp_config, WEBP_PRESET_DEFAULT, (float) quality)) {
return false;
}
WebPPicture pic;
WebPPictureInit(&pic);
pic.width = pixmap.width();
pic.height = pixmap.height();
pic.writer = stream_writer;
pic.custom_ptr = (void*)stream;
const SkPMColor* colors = pixmap.ctable() ? pixmap.ctable()->readColors() : nullptr;
const uint8_t* src = (uint8_t*)pixmap.addr();
const int rgbStride = pic.width * bpp;
const size_t rowBytes = pixmap.rowBytes();
// Import (for each scanline) the bit-map image (in appropriate color-space)
// to RGB color space.
std::unique_ptr<uint8_t[]> rgb(new uint8_t[rgbStride * pic.height]);
for (int y = 0; y < pic.height; ++y) {
scanline_import(src + y * rowBytes, &rgb[y * rgbStride], pic.width, colors);
}
bool ok;
if (bpp == 3) {
ok = SkToBool(WebPPictureImportRGB(&pic, &rgb[0], rgbStride));
} else {
ok = SkToBool(WebPPictureImportRGBA(&pic, &rgb[0], rgbStride));
}
ok = ok && WebPEncode(&webp_config, &pic);
WebPPictureFree(&pic);
return ok;
}
#endif
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