Move some methods to SkiaServe's Request, this is still very leaky

tools/skiaserve/Request.cpp

+/*
+ * 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;
+}
+