/* === S Y N F I G ========================================================= */
/*! \file mptr_png.cpp
** \brief ppm Target Module
**
** $Id$
**
** \legal
** Copyright (c) 2002-2005 Robert B. Quattlebaum Jr., Adrian Bentley
** Copyright (c) 2007 Chris Moore
**
** This package is free software; you can redistribute it and/or
** modify it under the terms of the GNU General Public License as
** published by the Free Software Foundation; either version 2 of
** the License, or (at your option) any later version.
**
** This package is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
** General Public License for more details.
** \endlegal
**
** === N O T E S ===========================================================
**
** ========================================================================= */
/*!
** \todo Support 16 bit PNG files
** \todo Support GAMMA correction
** \todo Fix memory leaks
*/
/* === H E A D E R S ======================================================= */
#ifdef USING_PCH
# include "pch.h"
#else
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "mptr_png.h"
#include <synfig/importer.h>
#include <synfig/time.h>
#include <synfig/general.h>
#include <synfig/localization.h>
#include <cstdio>
#include <algorithm>
#include <functional>
#endif
/* === M A C R O S ========================================================= */
using namespace synfig;
using namespace std;
using namespace etl;
#define PNG_CHECK_BYTES 8
/* === G L O B A L S ======================================================= */
SYNFIG_IMPORTER_INIT(png_mptr);
SYNFIG_IMPORTER_SET_NAME(png_mptr,"png");
SYNFIG_IMPORTER_SET_EXT(png_mptr,"png");
SYNFIG_IMPORTER_SET_VERSION(png_mptr,"0.1");
SYNFIG_IMPORTER_SET_CVS_ID(png_mptr,"$Id$");
SYNFIG_IMPORTER_SET_SUPPORTS_FILE_SYSTEM_WRAPPER(png_mptr, true);
/* === M E T H O D S ======================================================= */
namespace {
inline unsigned short get_channel(png_bytep *rows, int bit_depth, int row, int col) {
unsigned int x = bit_depth > 8
? ((unsigned short*)(rows[row]))[col]
: rows[row] [col];
unsigned int max = (1 << bit_depth) - 1;
return (x*65536u - 1u)/max;
}
}
void
png_mptr::png_out_error(png_struct */*png_data*/,const char *msg)
{
//png_mptr *me=(png_mptr*)png_data->error_ptr;
synfig::error(strprintf("png_mptr: error: %s",msg));
//me->ready=false;
}
void
png_mptr::png_out_warning(png_struct */*png_data*/,const char *msg)
{
//png_mptr *me=(png_mptr*)png_data->error_ptr;
synfig::warning(strprintf("png_mptr: warning: %s",msg));
//me->ready=false;
}
void
png_mptr::read_callback(png_structp png_ptr, png_bytep out_bytes, png_size_t bytes_count_to_read)
{
FileSystem::ReadStream *stream = (FileSystem::ReadStream*)png_get_io_ptr(png_ptr);
png_size_t s = stream == NULL
? 0
: stream->read_block(out_bytes, bytes_count_to_read);
if (s < bytes_count_to_read)
memset(out_bytes + s, 0, bytes_count_to_read - s);
}
png_mptr::png_mptr(const synfig::FileSystem::Identifier &identifier):
Importer(identifier)
{
}
png_mptr::~png_mptr()
{
}
bool
png_mptr::get_frame(synfig::Surface &surface, const synfig::RendDesc &/*renddesc*/, Time, synfig::ProgressCallback */*cb*/)
{
/* Open the file pointer */
FileSystem::ReadStream::Handle stream = identifier.get_read_stream();
if (!stream)
{
//! \todo THROW SOMETHING
throw strprintf("Unable to physically open %s",identifier.filename.c_str());
return false;
}
/* Make sure we are dealing with a PNG format file */
png_byte header[PNG_CHECK_BYTES];
if (!stream->read_variable(header))
{
//! \todo THROW SOMETHING
throw strprintf("Cannot read header from \"%s\"",identifier.filename.c_str());
return false;
}
if (0 != png_sig_cmp(header, 0, PNG_CHECK_BYTES))
{
//! \todo THROW SOMETHING
throw strprintf("This (\"%s\") doesn't appear to be a PNG file",identifier.filename.c_str());
return false;
}
png_structp png_ptr = png_create_read_struct
(PNG_LIBPNG_VER_STRING, (png_voidp)this,
&png_mptr::png_out_error, &png_mptr::png_out_warning);
if (!png_ptr)
{
//! \todo THROW SOMETHING
throw String("error on importer construction, *WRITEME*3");
return false;
}
png_infop info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr)
{
png_destroy_read_struct(&png_ptr,
(png_infopp)NULL, (png_infopp)NULL);
//! \todo THROW SOMETHING
throw String("error on importer construction, *WRITEME*4");
return false;
}
png_infop end_info = png_create_info_struct(png_ptr);
if (!end_info)
{
png_destroy_read_struct(&png_ptr, &info_ptr,
(png_infopp)NULL);
//! \todo THROW SOMETHING
throw String("error on importer construction, *WRITEME*4");
return false;
}
png_set_read_fn(png_ptr, stream.get(), read_callback);
png_set_sig_bytes(png_ptr,PNG_CHECK_BYTES);
png_read_info(png_ptr, info_ptr);
int bit_depth,color_type,interlace_type, compression_type,filter_method;
png_uint_32 width,height;
png_get_IHDR(png_ptr, info_ptr, &width, &height,
&bit_depth, &color_type, &interlace_type,
&compression_type, &filter_method);
if (bit_depth > 16) {
synfig::error("png_mptr: error: bit depth not supported: %d", bit_depth);
throw etl::strprintf("png_mptr: error: bit depth not supported: %d", bit_depth);
return false;
}
if (bit_depth < 8)
png_set_packing(png_ptr);
double fgamma;
if (png_get_gAMA(png_ptr, info_ptr, &fgamma))
{
synfig::info("PNG: Image gamma is %f",fgamma);
png_set_gamma(png_ptr, gamma().get_gamma(), fgamma);
}
/*
if (setjmp(png_jmpbuf(png_ptr)))
{
synfig::error("Unable to setup longjump");
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
fclose(file);
//! \todo THROW SOMETHING
throw String("error on importer construction, *WRITEME*5");
return;
}
*/
// man libpng tells me:
// You must use png_transforms and not call any
// png_set_transform() functions when you use png_read_png().
// but we used png_set_gamma(), which may be why we were seeing a crash at the end
// png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING|PNG_TRANSFORM_STRIP_16, NULL);
png_read_update_info(png_ptr, info_ptr);
png_uint_32 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
// allocate buffer to read image data into
png_bytep *row_pointers=new png_bytep[height];
png_byte *data = new png_byte[rowbytes*height];
for (png_uint_32 i = 0; i < height; i++)
row_pointers[i] = &(data[rowbytes*i]);
png_read_image(png_ptr, row_pointers);
png_uint_32 x, y;
surface.set_wh(width,height);
switch(color_type)
{
case PNG_COLOR_TYPE_RGB:
for(y=0;y<height;y++)
for(x=0;x<width;x++)
{
float r=gamma().r_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*3+0) );
float g=gamma().g_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*3+1) );
float b=gamma().b_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*3+2) );
surface[y][x]=Color(r, g, b, 1.0);
}
break;
case PNG_COLOR_TYPE_RGB_ALPHA:
for(y=0;y<height;y++)
for(x=0;x<width;x++)
{
float r=gamma().r_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*4+0) );
float g=gamma().g_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*4+1) );
float b=gamma().b_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*4+2) );
float a=gamma().a_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*4+3) );
surface[y][x]=Color(r, g, b, a);
}
break;
case PNG_COLOR_TYPE_GRAY:
for(y=0;y<height;y++)
for(x=0;x<width;x++)
{
float gray=gamma().g_U16_to_F32( get_channel(row_pointers, bit_depth, y, x) );
info("%f %d", gray, (unsigned char)row_pointers[y][x]);
surface[y][x]=Color(gray, gray, gray, 1.0);
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
for(y=0;y<height;y++)
for(x=0;x<width;x++)
{
float gray=gamma().g_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*2+0) );
float a =gamma().a_U16_to_F32( get_channel(row_pointers, bit_depth, y, x*2+1) );
surface[y][x]=Color(gray, gray, gray, a);
}
break;
case PNG_COLOR_TYPE_PALETTE:
{
if (bit_depth > 8) {
synfig::error("png_mptr: error: bit depth with palette not supported: %d", bit_depth);
throw etl::strprintf("png_mptr: error: bit depth with palette not supported: %d", bit_depth);
return false;
}
png_colorp palette;
int num_palette;
png_get_PLTE(png_ptr, info_ptr, &palette, &num_palette);
png_bytep trans_alpha = NULL;
int num_trans = 0;
bool has_alpha = png_get_tRNS(png_ptr, info_ptr, &trans_alpha, &num_trans, NULL)
& PNG_INFO_tRNS;
for(y=0;y<height;y++)
for(x=0;x<width;x++)
{
float r=gamma().r_U8_to_F32((unsigned char)palette[row_pointers[y][x]].red);
float g=gamma().g_U8_to_F32((unsigned char)palette[row_pointers[y][x]].green);
float b=gamma().b_U8_to_F32((unsigned char)palette[row_pointers[y][x]].blue);
unsigned char ac = 255;
if (has_alpha && num_trans > 0 && trans_alpha != NULL && row_pointers[y][x] < num_trans)
ac = trans_alpha[row_pointers[y][x]];
float a=gamma().a_U8_to_F32(ac);
surface[y][x]=Color(r, g, b, a);
}
break;
}
default:
png_read_end(png_ptr, end_info);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
synfig::error("png_mptr: error: Unsupported color type");
//! \todo THROW SOMETHING
throw String("error on importer construction, *WRITEME*6");
return false;
}
png_read_end(png_ptr, end_info);
png_destroy_read_struct(&png_ptr, &info_ptr, &end_info);
return true;
}