@@ -3,159 +3,121 @@
#include " Common/Image.h"
#include < memory>
#include < string>
#include < vector>
#include < png .h>
#include < spng .h>
#include " Common/Assert.h"
#include " Common/CommonTypes.h"
#include " Common/IOFile.h"
#include " Common/ImageC.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 (const std::vector<u8>& input, std::vector<u8>* data_out, u32* width_out,
u32* height_out)
{
// Using the 'Simplified API' of libpng; see section V in the libpng manual.
auto ctx = make_spng_ctx (0 );
if (!ctx)
return false ;
// Read header
png_image png = {};
png.version = PNG_IMAGE_VERSION;
if (!png_image_begin_read_from_memory (&png, input.data (), input.size ()))
if (spng_set_png_buffer (ctx.get (), input.data (), input.size ()))
return false ;
// Prepare output vector
png.format = PNG_FORMAT_RGBA;
size_t png_size = PNG_IMAGE_SIZE (png);
data_out->resize (png_size);
spng_ihdr ihdr{};
if (spng_get_ihdr (ctx.get (), &ihdr))
return false ;
// Convert to RGBA and write into output vector
if (!png_image_finish_read (&png, nullptr , data_out->data (), 0 , nullptr ))
const int format = SPNG_FMT_RGBA8;
size_t decoded_len = 0 ;
if (spng_decoded_image_size (ctx.get (), format, &decoded_len))
return false ;
*width_out = png.width ;
*height_out = png.height ;
data_out->resize (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 ;
}
static void WriteCallback (png_structp png_ptr, png_bytep data, size_t length)
{
std::vector<u8>* buffer = static_cast <std::vector<u8>*>(png_get_io_ptr (png_ptr));
buffer->insert (buffer->end (), data, data + length);
}
static void ErrorCallback (ErrorHandler* self, const char * msg)
{
std::vector<std::string>* errors = static_cast <std::vector<std::string>*>(self->error_list );
errors->emplace_back (msg);
}
static void WarningCallback (ErrorHandler* self, const char * msg)
{
std::vector<std::string>* warnings = static_cast <std::vector<std::string>*>(self->warning_list );
warnings->emplace_back (msg);
}
bool SavePNG (const std::string& path, const u8* input, ImageByteFormat format, u32 width,
u32 height, int stride, int level)
u32 height, u32 stride, int level)
{
Common::Timer timer;
timer.Start ();
size_t byte_per_pixel;
int color_type;
spng_color_type color_type;
switch (format)
{
case ImageByteFormat::RGB:
color_type = PNG_COLOR_TYPE_RGB;
byte_per_pixel = 3 ;
color_type = SPNG_COLOR_TYPE_TRUECOLOR;
break ;
case ImageByteFormat::RGBA:
color_type = PNG_COLOR_TYPE_RGBA;
byte_per_pixel = 4 ;
color_type = SPNG_COLOR_TYPE_TRUECOLOR_ALPHA;
break ;
default :
ASSERT_MSG (FRAMEDUMP, false , " Invalid format {}" static_cast <int >(format));
return false ;
}
// libpng doesn't handle non-ASCII characters in path, so write in two steps:
// first to memory, then to file
std::vector<u8> buffer;
buffer.reserve (byte_per_pixel * width * height);
std::vector<std::string> warnings;
std::vector<std::string> errors;
ErrorHandler error_handler;
error_handler.error_list = &errors;
error_handler.warning_list = &warnings;
error_handler.StoreError = ErrorCallback;
error_handler.StoreWarning = WarningCallback;
std::vector<const u8*> rows;
rows.reserve (height);
for (u32 row = 0 ; row < height; row++)
{
rows.push_back (&input[row * stride]);
}
auto ctx = make_spng_ctx (SPNG_CTX_ENCODER);
if (!ctx)
return false ;
png_structp png_ptr =
png_create_write_struct (PNG_LIBPNG_VER_STRING, &error_handler, PngError, PngWarning);
png_infop info_ptr = png_create_info_struct (png_ptr) ;
auto outfile = File::IOFile (path, " wb " );
if ( spng_set_png_file (ctx. get (), outfile. GetHandle ()))
return false ;
bool success = false ;
if (png_ptr != nullptr && info_ptr != nullptr )
{
success = SavePNG0 (png_ptr, info_ptr, color_type, width, height, level, &buffer, WriteCallback,
const_cast <u8**>(rows.data ()));
}
png_destroy_write_struct (&png_ptr, &info_ptr);
if (spng_set_option (ctx.get (), SPNG_IMG_COMPRESSION_LEVEL, level))
return false ;
if (success)
{
File::IOFile outfile (path, " wb"
if (!outfile)
return false ;
success = outfile.WriteBytes (buffer.data (), buffer.size ());
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 ;
timer.Stop ();
INFO_LOG_FMT (FRAMEDUMP, " {} byte {} by {} image saved to {} at level {} in {}" size (),
width, height, path, level, timer.GetTimeElapsedFormatted ());
ASSERT (errors.size () == 0 );
if (warnings.size () != 0 )
if (spng_encode_image (ctx.get (), nullptr , 0 , SPNG_FMT_PNG, SPNG_ENCODE_PROGRESSIVE))
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)
{
WARN_LOG_FMT (FRAMEDUMP, " Saved with {} warnings: " warnings. size ());
for ( auto & warning : warnings)
WARN_LOG_FMT (FRAMEDUMP, " libpng warning: {} " , warning) ;
ERROR_LOG_FMT (FRAMEDUMP, " Failed to save {} by {} image to {} at level {}: error {} " width,
height, path, level, err);
return false ;
}
}
else
{
ERROR_LOG_FMT (FRAMEDUMP,
" Failed to save {} by {} image to {} at level {}: {} warnings, {} errors"
height, path, level, warnings.size (), errors.size ());
for (auto & error : errors)
ERROR_LOG_FMT (FRAMEDUMP, " libpng error: {}"
for (auto & warning : warnings)
WARN_LOG_FMT (FRAMEDUMP, " libpng warning: {}"
}
return success;
}
bool ConvertRGBAToRGBAndSavePNG ( const std::string& path, const u8* input, u32 width, u32 height,
int stride, int level)
{
const std::vector<u8> data = RGBAToRGB (input, width, height, stride );
return SavePNG (path, data. data (), ImageByteFormat::RGB, width, height, width * 3 , level) ;
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 {} " , image_len, width,
height, path, level, timer. GetTimeElapsedFormatted () );
return true ;
}
std::vector<u8> RGBAToRGB (const u8* input, u32 width, u32 height, int row_stride)
static std::vector<u8> RGBAToRGB (const u8* input, u32 width, u32 height, u32 row_stride)
{
std::vector<u8> buffer;
buffer.reserve (width * height * 3 );
@@ -172,4 +134,11 @@ std::vector<u8> RGBAToRGB(const u8* input, u32 width, u32 height, int row_stride
}
return buffer;
}
bool ConvertRGBAToRGBAndSavePNG (const std::string& path, const u8* input, u32 width, u32 height,
u32 stride, int level)
{
const std::vector<u8> data = RGBAToRGB (input, width, height, stride);
return SavePNG (path, data.data (), ImageByteFormat::RGB, width, height, width * 3 , level);
}
} // namespace Common