112 lines
3.0 KiB
C++
112 lines
3.0 KiB
C++
// Copyright 2016 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include "Common/Image.h"
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#include <string>
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#include <vector>
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#include <png.h>
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#include "Common/CommonTypes.h"
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#include "Common/File.h"
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namespace Common
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{
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bool LoadPNG(const std::vector<u8>& input, std::vector<u8>* data_out, u32* width_out,
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u32* height_out)
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{
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// Using the 'Simplified API' of libpng; see section V in the libpng manual.
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// Read header
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png_image png = {};
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png.version = PNG_IMAGE_VERSION;
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if (!png_image_begin_read_from_memory(&png, input.data(), input.size()))
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return false;
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// Prepare output vector
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png.format = PNG_FORMAT_RGBA;
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size_t png_size = PNG_IMAGE_SIZE(png);
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data_out->resize(png_size);
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// Convert to RGBA and write into output vector
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if (!png_image_finish_read(&png, nullptr, data_out->data(), 0, nullptr))
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return false;
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*width_out = png.width;
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*height_out = png.height;
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return true;
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}
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bool SavePNG(const std::string& path, const u8* input, ImageByteFormat format, u32 width,
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u32 height, int stride)
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{
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png_image png = {};
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png.version = PNG_IMAGE_VERSION;
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png.width = width;
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png.height = height;
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size_t byte_per_pixel;
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switch (format)
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{
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case ImageByteFormat::RGB:
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png.format = PNG_FORMAT_RGB;
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byte_per_pixel = 3;
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break;
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case ImageByteFormat::RGBA:
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png.format = PNG_FORMAT_RGBA;
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byte_per_pixel = 4;
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break;
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default:
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return false;
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}
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// libpng doesn't handle non-ASCII characters in path, so write in two steps:
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// first to memory, then to file
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std::vector<u8> buffer(byte_per_pixel * width * height);
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png_alloc_size_t size = buffer.size();
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int success = png_image_write_to_memory(&png, buffer.data(), &size, 0, input, stride, nullptr);
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if (!success && size > buffer.size())
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{
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// initial buffer size guess was too small, set to the now-known size and retry
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buffer.resize(size);
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png.warning_or_error = 0;
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success = png_image_write_to_memory(&png, buffer.data(), &size, 0, input, stride, nullptr);
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}
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if (!success || (png.warning_or_error & PNG_IMAGE_ERROR) != 0)
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return false;
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File::IOFile outfile(path, "wb");
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if (!outfile)
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return false;
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return outfile.WriteBytes(buffer.data(), size);
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}
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bool ConvertRGBAToRGBAndSavePNG(const std::string& path, const u8* input, u32 width, u32 height,
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int stride)
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{
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const std::vector<u8> data = RGBAToRGB(input, width, height, stride);
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return SavePNG(path, data.data(), ImageByteFormat::RGB, width, height);
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}
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std::vector<u8> RGBAToRGB(const u8* input, u32 width, u32 height, int row_stride)
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{
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std::vector<u8> buffer;
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buffer.reserve(width * height * 3);
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for (u32 y = 0; y < height; ++y)
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{
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const u8* pos = input + y * row_stride;
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for (u32 x = 0; x < width; ++x)
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{
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buffer.push_back(pos[x * 4]);
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buffer.push_back(pos[x * 4 + 1]);
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buffer.push_back(pos[x * 4 + 2]);
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}
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}
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return buffer;
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}
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} // namespace Common
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