| /* |
| * Copyright 2011 Google Inc. |
| * |
| * 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. |
| */ |
| // Author: abliss@google.com (Adam Bliss) |
| |
| #ifndef NET_INSTAWEB_SPRITER_LIBPNG_IMAGE_LIBRARY_H_ |
| #define NET_INSTAWEB_SPRITER_LIBPNG_IMAGE_LIBRARY_H_ |
| |
| // TODO(huibao): Move LibpngImageLibrary to pagespeed/kernel/image/. |
| // Refactor LibpngImageLibrary. This class can be split into 3 parts: |
| // reader, writer, and canvas creater. The first two parts can be merged |
| // with png_optimizer.cc and png_optimizer.h. |
| |
| extern "C" { |
| #ifdef USE_SYSTEM_LIBPNG |
| #include "png.h" // NOLINT |
| #else |
| #include "third_party/libpng/src/png.h" |
| #endif |
| } // extern "C" |
| |
| #include "net/instaweb/spriter/image_library_interface.h" |
| #include "pagespeed/kernel/base/string.h" |
| |
| namespace net_instaweb { |
| namespace spriter { |
| |
| /** |
| * An implementation of the ImageLibraryInterface using direct calls to libpng. |
| * The advantage of this over OpenCV is that it can handle transparency. The |
| * output of this library is always an RGBA PNG with 8 bits per channel (so |
| * 16-bit images will be degraded). |
| */ |
| class LibpngImageLibrary : public ImageLibraryInterface { |
| public: |
| LibpngImageLibrary(const FilePath& base_input_path, |
| const FilePath& base_output_path, |
| Delegate* delegate); |
| virtual ~LibpngImageLibrary() {} |
| |
| protected: |
| // Images are immutable rectangular regions of pixels. |
| class Image : public ImageLibraryInterface::Image { |
| public: |
| // Takes ownership of rows. |
| Image(ImageLibraryInterface* lib, |
| png_structp png_struct, png_infop png_info, png_bytep* rows); |
| virtual ~Image(); |
| |
| virtual bool GetDimensions(int* out_width, int* out_height) const; |
| const png_bytep* Rows() const; |
| |
| private: |
| png_structp png_struct_; |
| png_infop png_info_; |
| png_bytep* rows_; |
| DISALLOW_COPY_AND_ASSIGN(Image); |
| }; |
| |
| // Read an image from disk. Return NULL (after calling delegate |
| // method) on error. Caller owns the returned pointer. |
| virtual ImageLibraryInterface::Image* ReadFromFile(const FilePath& path); |
| |
| // Canvases are mutable rectangles onto which a program may draw. |
| // For now, we support stamping images into a canvas, and writing |
| // a canvas to a file. |
| class Canvas : public ImageLibraryInterface::Canvas { |
| public: |
| Canvas(ImageLibraryInterface* lib, const Delegate* d, |
| const GoogleString& base_out_path, |
| int width, int height); |
| virtual ~Canvas(); |
| virtual bool DrawImage(const ImageLibraryInterface::Image* image, int x, |
| int y); |
| virtual bool WriteToFile(const FilePath& write_path, ImageFormat format); |
| |
| private: |
| const Delegate* delegate_; |
| const GoogleString base_out_path_; |
| int width_; |
| int height_; |
| png_bytep* rows_; |
| DISALLOW_COPY_AND_ASSIGN(Canvas); |
| }; |
| |
| virtual ImageLibraryInterface::Canvas* CreateCanvas(int width, int height); |
| |
| private: |
| friend class LibpngImageLibraryTest; |
| DISALLOW_COPY_AND_ASSIGN(LibpngImageLibrary); |
| }; |
| |
| } // namespace spriter |
| } // namespace net_instaweb |
| |
| #endif // NET_INSTAWEB_SPRITER_LIBPNG_IMAGE_LIBRARY_H_ |