| // Copyright 2016 Google Inc. All Rights Reserved. |
| // |
| // 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. |
| |
| #ifndef STARBOARD_NPLB_BLITTER_PIXEL_TESTS_IMAGE_H_ |
| #define STARBOARD_NPLB_BLITTER_PIXEL_TESTS_IMAGE_H_ |
| |
| #include <string> |
| |
| #include "starboard/blitter.h" |
| #include "starboard/file.h" |
| |
| #if SB_HAS(BLITTER) |
| |
| namespace starboard { |
| namespace nplb { |
| namespace blitter_pixel_tests { |
| |
| // The Image class provides image-related functionality required |
| // by the Starboard Blitter API pixel tests. In particular, it provides |
| // code to read/write images from/to PNGs, code for loading an image from an |
| // SbBlitterSurface, code for applying a Gaussian blur to an image, and code for |
| // pixel testing two different images. |
| class Image { |
| public: |
| // Download image data from a Starboard Blitter API surface. |
| explicit Image(SbBlitterSurface surface); |
| // Constructor allowing one to explicitly pass in the image data. Note that |
| // Image will take ownership of |passed_pixel_data|. |
| Image(uint8_t* passed_pixel_data, int width, int height); |
| // Loads image data from a PNG file located at |png_path|. |
| explicit Image(const std::string& png_path); |
| ~Image(); |
| |
| // Tests to see if a file can be opened, in the same way that the constructor |
| // that reads from a PNG file will open that PNG file. |
| static bool CanOpenFile(const std::string& path); |
| |
| // Performs a diff of two images. |pixel_test_value_fuzz| gives the distance |
| // that a pixel color component must differ before being considered a |
| // different value. Setting |pixel_test_value_fuzz| to 0 will make the diff |
| // test strict. |is_same| will be set to true if there are no differing |
| // pixels and false if any pixel differs. |
| Image Diff(const Image& other, |
| int pixel_test_value_fuzz, |
| bool* is_same) const; |
| |
| // Returns a new image that is a blurred version of the original. The blur |
| // is performed by convolving the original image with a Gaussian function |
| // whose standard deviation is specified by |sigma|, in units of pixels. |
| Image GaussianBlur(float sigma) const; |
| |
| // Saves the contents of this image to a PNG file located at |png_path|. |
| void WriteToPNG(const std::string& png_path) const; |
| |
| private: |
| static SbFile OpenFileForReading(const std::string& path); |
| |
| // Pixel data stored as 32-bit RGBA (byte-order). |
| uint8_t* pixel_data_; |
| int width_; |
| int height_; |
| }; |
| |
| } // namespace blitter_pixel_tests |
| } // namespace nplb |
| } // namespace starboard |
| |
| #endif // SB_HAS(BLITTER) |
| |
| #endif // STARBOARD_NPLB_BLITTER_PIXEL_TESTS_IMAGE_H_ |