mirror of
https://github.com/libretro/dolphin
synced 2024-09-19 12:05:10 -04:00
147 lines
3.9 KiB
C++
147 lines
3.9 KiB
C++
// Copyright 2008 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 <list>
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#include <string>
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#include <vector>
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#include "Common/CommonTypes.h"
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#include "Common/File.h"
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#include "Common/FileUtil.h"
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#include "Common/MsgHandler.h"
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#include "VideoCommon/ImageWrite.h"
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#include "png.h"
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bool SaveData(const std::string& filename, const std::string& data)
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{
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std::ofstream f;
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File::OpenFStream(f, filename, std::ios::binary);
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f << data;
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return true;
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}
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#ifdef _MSC_VER
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#pragma warning(push)
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#pragma warning(disable : 4611)
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#endif
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/*
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TextureToPng
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Inputs:
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data : This is an array of RGBA with 8 bits per channel. 4 bytes for each pixel.
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row_stride: Determines the amount of bytes per row of pixels.
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*/
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bool TextureToPng(const u8* data, int row_stride, const std::string& filename, int width,
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int height, bool saveAlpha)
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{
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if (!data)
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return false;
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bool success = false;
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char title[] = "Dolphin Screenshot";
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char title_key[] = "Title";
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png_structp png_ptr = nullptr;
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png_infop info_ptr = nullptr;
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std::vector<u8> buffer;
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// Open file for writing (binary mode)
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File::IOFile fp(filename, "wb");
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if (!fp.IsOpen())
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{
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PanicAlertT("Screenshot failed: Could not open file \"%s\" (error %d)", filename.c_str(),
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errno);
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goto finalise;
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}
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// Initialize write structure
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png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
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if (png_ptr == nullptr)
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{
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PanicAlert("Screenshot failed: Could not allocate write struct");
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goto finalise;
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}
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// Initialize info structure
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info_ptr = png_create_info_struct(png_ptr);
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if (info_ptr == nullptr)
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{
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PanicAlert("Screenshot failed: Could not allocate info struct");
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goto finalise;
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}
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// Classical libpng error handling uses longjmp to do C-style unwind.
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// Modern libpng does support a user callback, but it's required to operate
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// in the same way (just gives a chance to do stuff before the longjmp).
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// Instead of futzing with it, we use gotos specifically so the compiler
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// will still generate proper destructor calls for us (hopefully).
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// We also do not use any local variables outside the region longjmp may
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// have been called from if they were modified inside that region (they
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// would need to be volatile).
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if (setjmp(png_jmpbuf(png_ptr)))
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{
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PanicAlert("Screenshot failed: Error during PNG creation");
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goto finalise;
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}
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// Begin region which may call longjmp
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png_init_io(png_ptr, fp.GetHandle());
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// Write header (8 bit color depth)
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png_set_IHDR(png_ptr, info_ptr, width, height, 8, PNG_COLOR_TYPE_RGB_ALPHA, PNG_INTERLACE_NONE,
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PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
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png_text title_text;
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title_text.compression = PNG_TEXT_COMPRESSION_NONE;
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title_text.key = title_key;
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title_text.text = title;
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png_set_text(png_ptr, info_ptr, &title_text, 1);
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png_write_info(png_ptr, info_ptr);
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if (!saveAlpha)
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buffer.resize(width * 4);
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// Write image data
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for (auto y = 0; y < height; ++y)
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{
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const u8* row_ptr = data + y * row_stride;
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if (!saveAlpha)
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{
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for (int x = 0; x < width; x++)
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{
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for (int i = 0; i < 3; i++)
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buffer[4 * x + i] = row_ptr[4 * x + i];
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buffer[4 * x + 3] = 0xff;
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}
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row_ptr = buffer.data();
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}
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// The old API uses u8* instead of const u8*. It doesn't write
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// to this pointer, but to fit the API, we have to drop the const qualifier.
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png_write_row(png_ptr, const_cast<u8*>(row_ptr));
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}
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// End write
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png_write_end(png_ptr, nullptr);
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// End region which may call longjmp
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success = true;
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finalise:
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if (info_ptr != nullptr)
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png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
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if (png_ptr != nullptr)
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png_destroy_write_struct(&png_ptr, (png_infopp) nullptr);
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return success;
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}
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#ifdef _MSC_VER
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#pragma warning(pop)
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#endif
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