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// Copyright 2016 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "Common/Image.h"
#include <memory>
#include <string>
#include <spng.h>
#include "Common/Assert.h"
#include "Common/CommonTypes.h"
#include "Common/IOFile.h"
#include "Common/Logging/Log.h"
#include "Common/Timer.h"
namespace Common
{
static void spng_free(spng_ctx* ctx)
{
if (ctx)
spng_ctx_free(ctx);
}
static auto make_spng_ctx(int flags)
{
return std::unique_ptr<spng_ctx, decltype(&spng_free)>(spng_ctx_new(flags), spng_free);
}
bool LoadPNG(std::span<const u8> input, Common::UniqueBuffer<u8>* data_out, u32* width_out,
u32* height_out)
{
auto ctx = make_spng_ctx(0);
if (!ctx)
return false;
if (spng_set_png_buffer(ctx.get(), input.data(), input.size()))
return false;
spng_ihdr ihdr{};
if (spng_get_ihdr(ctx.get(), &ihdr))
return false;
const int format = SPNG_FMT_RGBA8;
size_t decoded_len = 0;
if (spng_decoded_image_size(ctx.get(), format, &decoded_len))
return false;
data_out->reset(decoded_len);
if (spng_decode_image(ctx.get(), data_out->data(), decoded_len, format, SPNG_DECODE_TRNS))
return false;
*width_out = ihdr.width;
*height_out = ihdr.height;
return true;
}
bool SavePNG(const std::string& path, const u8* input, ImageByteFormat format, u32 width,
u32 height, u32 stride, int level)
{
Common::Timer timer;
timer.Start();
spng_color_type color_type;
switch (format)
{
case ImageByteFormat::RGB:
color_type = SPNG_COLOR_TYPE_TRUECOLOR;
break;
case ImageByteFormat::RGBA:
color_type = SPNG_COLOR_TYPE_TRUECOLOR_ALPHA;
break;
default:
ASSERT_MSG(FRAMEDUMP, false, "Invalid format {}", static_cast<int>(format));
return false;
}
auto ctx = make_spng_ctx(SPNG_CTX_ENCODER);
if (!ctx)
return false;
auto outfile = File::IOFile(path, "wb");
if (spng_set_png_file(ctx.get(), outfile.GetHandle()))
return false;
if (spng_set_option(ctx.get(), SPNG_IMG_COMPRESSION_LEVEL, level))
return false;
spng_ihdr ihdr{};
ihdr.width = width;
ihdr.height = height;
ihdr.color_type = color_type;
ihdr.bit_depth = 8;
if (spng_set_ihdr(ctx.get(), &ihdr))
return false;
if (spng_encode_image(ctx.get(), nullptr, 0, SPNG_FMT_PNG,
SPNG_ENCODE_PROGRESSIVE | SPNG_ENCODE_FINALIZE))
{
return false;
}
for (u32 row = 0; row < height; row++)
{
const int err = spng_encode_row(ctx.get(), &input[row * stride], stride);
if (err == SPNG_EOI)
break;
if (err)
{
ERROR_LOG_FMT(FRAMEDUMP, "Failed to save {} by {} image to {} at level {}: error {}", width,
height, path, level, err);
return false;
}
}
size_t image_len = 0;
spng_decoded_image_size(ctx.get(), SPNG_FMT_PNG, &image_len);
INFO_LOG_FMT(FRAMEDUMP, "{} byte {} by {} image saved to {} at level {} in {} ms", image_len,
width, height, path, level, timer.ElapsedMs());
return true;
}
static Common::UniqueBuffer<u8> RGBAToRGB(const u8* input, u32 width, u32 height, u32 row_stride)
{
Common::UniqueBuffer<u8> buffer;
buffer.reset(width * height * 3);
std::size_t buffer_index = 0;
for (u32 y = 0; y < height; ++y)
{
const u8* pos = input + y * row_stride;
for (u32 x = 0; x < width; ++x)
{
buffer[buffer_index++] = pos[x * 4];
buffer[buffer_index++] = pos[x * 4 + 1];
buffer[buffer_index++] = pos[x * 4 + 2];
}
}
return buffer;
}
bool ConvertRGBAToRGBAndSavePNG(const std::string& path, const u8* input, u32 width, u32 height,
u32 stride, int level)
{
const auto data = RGBAToRGB(input, width, height, stride);
return SavePNG(path, data.data(), ImageByteFormat::RGB, width, height, width * 3, level);
}
} // namespace Common
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