| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "Request.h" |
| |
| #include "png.h" |
| |
| const int Request::kImageWidth = 1920; |
| const int Request::kImageHeight = 1080; |
| |
| static void write_png_callback(png_structp png_ptr, png_bytep data, png_size_t length) { |
| SkWStream* out = (SkWStream*) png_get_io_ptr(png_ptr); |
| out->write(data, length); |
| } |
| |
| static void write_png(const png_bytep rgba, png_uint_32 width, png_uint_32 height, SkWStream& out) { |
| png_structp png = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL); |
| SkASSERT(png != nullptr); |
| png_infop info_ptr = png_create_info_struct(png); |
| SkASSERT(info_ptr != nullptr); |
| if (setjmp(png_jmpbuf(png))) { |
| SkFAIL("png encode error"); |
| } |
| png_set_IHDR(png, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB, PNG_INTERLACE_NONE, |
| PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT); |
| png_set_compression_level(png, 1); |
| png_bytepp rows = (png_bytepp) sk_malloc_throw(height * sizeof(png_byte*)); |
| png_bytep pixels = (png_bytep) sk_malloc_throw(width * height * 3); |
| for (png_size_t y = 0; y < height; ++y) { |
| const png_bytep src = rgba + y * width * 4; |
| rows[y] = pixels + y * width * 3; |
| // convert from RGBA to RGB |
| for (png_size_t x = 0; x < width; ++x) { |
| rows[y][x * 3] = src[x * 4]; |
| rows[y][x * 3 + 1] = src[x * 4 + 1]; |
| rows[y][x * 3 + 2] = src[x * 4 + 2]; |
| } |
| } |
| png_set_filter(png, 0, PNG_NO_FILTERS); |
| png_set_rows(png, info_ptr, &rows[0]); |
| png_set_write_fn(png, &out, write_png_callback, NULL); |
| png_write_png(png, info_ptr, PNG_TRANSFORM_IDENTITY, NULL); |
| png_destroy_write_struct(&png, NULL); |
| sk_free(rows); |
| } |
| |
| SkBitmap* Request::getBitmapFromCanvas(SkCanvas* canvas) { |
| SkBitmap* bmp = new SkBitmap(); |
| SkImageInfo info = SkImageInfo::Make(kImageWidth, kImageHeight, kRGBA_8888_SkColorType, |
| kOpaque_SkAlphaType); |
| bmp->setInfo(info); |
| if (!canvas->readPixels(bmp, 0, 0)) { |
| fprintf(stderr, "Can't read pixels\n"); |
| return nullptr; |
| } |
| return bmp; |
| } |
| |
| SkData* Request::writeCanvasToPng(SkCanvas* canvas) { |
| // capture pixels |
| SkAutoTDelete<SkBitmap> bmp(getBitmapFromCanvas(canvas)); |
| SkASSERT(bmp); |
| |
| // write to png |
| SkDynamicMemoryWStream buffer; |
| write_png((const png_bytep) bmp->getPixels(), bmp->width(), bmp->height(), buffer); |
| return buffer.copyToData(); |
| } |
| |
| SkCanvas* Request::getCanvas() { |
| GrContextFactory* factory = fContextFactory; |
| SkGLContext* gl = factory->getContextInfo(GrContextFactory::kNative_GLContextType, |
| GrContextFactory::kNone_GLContextOptions).fGLContext; |
| gl->makeCurrent(); |
| SkASSERT(fDebugCanvas); |
| SkCanvas* target = fSurface->getCanvas(); |
| return target; |
| } |
| |
| void Request::drawToCanvas(int n) { |
| SkCanvas* target = this->getCanvas(); |
| fDebugCanvas->drawTo(target, n); |
| } |
| |
| SkData* Request::drawToPng(int n) { |
| this->drawToCanvas(n); |
| return writeCanvasToPng(this->getCanvas()); |
| } |
| |
| SkSurface* Request::createCPUSurface() { |
| SkImageInfo info = SkImageInfo::Make(kImageWidth, kImageHeight, kN32_SkColorType, |
| kPremul_SkAlphaType); |
| return SkSurface::NewRaster(info); |
| } |
| |
| SkSurface* Request::createGPUSurface() { |
| GrContext* context = fContextFactory->get(GrContextFactory::kNative_GLContextType, |
| GrContextFactory::kNone_GLContextOptions); |
| int maxRTSize = context->caps()->maxRenderTargetSize(); |
| SkImageInfo info = SkImageInfo::Make(SkTMin(kImageWidth, maxRTSize), |
| SkTMin(kImageHeight, maxRTSize), |
| kN32_SkColorType, kPremul_SkAlphaType); |
| uint32_t flags = 0; |
| SkSurfaceProps props(flags, SkSurfaceProps::kLegacyFontHost_InitType); |
| SkSurface* surface = SkSurface::NewRenderTarget(context, SkBudgeted::kNo, info, 0, |
| &props); |
| return surface; |
| } |
| |