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//========================================================================
//
// PNGWriter.cc
//
// This file is licensed under the GPLv2 or later
//
// Copyright (C) 2009 Warren Toomey <wkt@tuhs.org>
// Copyright (C) 2009 Shen Liang <shenzhuxi@gmail.com>
// Copyright (C) 2009, 2011 Albert Astals Cid <aacid@kde.org>
// Copyright (C) 2009 Stefan Thomas <thomas@eload24.com>
// Copyright (C) 2010, 2011 Adrian Johnson <ajohnson@redneon.com>
// Copyright (C) 2011 Thomas Klausner <wiz@danbala.tuwien.ac.at>
// Copyright (C) 2012 Pino Toscano <pino@kde.org>
//
//========================================================================
#include "PNGWriter.h"
#ifdef ENABLE_LIBPNG
#include <zlib.h>
#include <stdlib.h>
#include <string.h>
#include "poppler/Error.h"
#include "goo/gmem.h"
#include <png.h>
struct PNGWriterPrivate {
PNGWriter::Format format;
png_structp png_ptr;
png_infop info_ptr;
unsigned char *icc_data;
int icc_data_size;
char *icc_name;
bool sRGB_profile;
};
PNGWriter::PNGWriter(Format formatA)
{
priv = new PNGWriterPrivate;
priv->format = formatA;
priv->icc_data = NULL;
priv->icc_data_size = 0;
priv->icc_name = NULL;
priv->sRGB_profile = false;
}
PNGWriter::~PNGWriter()
{
/* cleanup heap allocation */
png_destroy_write_struct(&priv->png_ptr, &priv->info_ptr);
if (priv->icc_data) {
gfree(priv->icc_data);
free(priv->icc_name);
}
delete priv;
}
void PNGWriter::setICCProfile(const char *name, unsigned char *data, int size)
{
priv->icc_data = (unsigned char *)gmalloc(size);
memcpy(priv->icc_data, data, size);
priv->icc_data_size = size;
priv->icc_name = strdup(name);
}
void PNGWriter::setSRGBProfile()
{
priv->sRGB_profile = true;
}
bool PNGWriter::init(FILE *f, int width, int height, int hDPI, int vDPI)
{
/* libpng changed the png_set_iCCP() prototype in 1.5.0 */
#if PNG_LIBPNG_VER < 10500
png_charp icc_data_ptr = (png_charp)priv->icc_data;
#else
png_const_bytep icc_data_ptr = (png_const_bytep)priv->icc_data;
#endif
/* initialize stuff */
priv->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!priv->png_ptr) {
error(errInternal, -1, "png_create_write_struct failed");
return false;
}
priv->info_ptr = png_create_info_struct(priv->png_ptr);
if (!priv->info_ptr) {
error(errInternal, -1, "png_create_info_struct failed");
return false;
}
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "png_jmpbuf failed");
return false;
}
/* write header */
png_init_io(priv->png_ptr, f);
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "Error during writing header");
return false;
}
// Set up the type of PNG image and the compression level
png_set_compression_level(priv->png_ptr, Z_BEST_COMPRESSION);
// Silence silly gcc
png_byte bit_depth = -1;
png_byte color_type = -1;
switch (priv->format) {
case RGB:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB;
break;
case RGBA:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case GRAY:
bit_depth = 8;
color_type = PNG_COLOR_TYPE_GRAY;
break;
case MONOCHROME:
bit_depth = 1;
color_type = PNG_COLOR_TYPE_GRAY;
break;
}
png_byte interlace_type = PNG_INTERLACE_NONE;
png_set_IHDR(priv->png_ptr, priv->info_ptr, width, height, bit_depth, color_type, interlace_type, PNG_COMPRESSION_TYPE_DEFAULT, PNG_FILTER_TYPE_DEFAULT);
png_set_pHYs(priv->png_ptr, priv->info_ptr, hDPI/0.0254, vDPI/0.0254, PNG_RESOLUTION_METER);
if (priv->icc_data)
png_set_iCCP(priv->png_ptr, priv->info_ptr, priv->icc_name, PNG_COMPRESSION_TYPE_BASE, icc_data_ptr, priv->icc_data_size);
else if (priv->sRGB_profile)
png_set_sRGB(priv->png_ptr, priv->info_ptr, PNG_sRGB_INTENT_RELATIVE);
png_write_info(priv->png_ptr, priv->info_ptr);
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "error during writing png info bytes");
return false;
}
// pack 1 pixel/byte rows into 8 pixels/byte
if (priv->format == MONOCHROME)
png_set_packing(priv->png_ptr);
return true;
}
bool PNGWriter::writePointers(unsigned char **rowPointers, int rowCount)
{
png_write_image(priv->png_ptr, rowPointers);
/* write bytes */
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "Error during writing bytes");
return false;
}
return true;
}
bool PNGWriter::writeRow(unsigned char **row)
{
// Write the row to the file
png_write_rows(priv->png_ptr, row, 1);
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "error during png row write");
return false;
}
return true;
}
bool PNGWriter::close()
{
/* end write */
png_write_end(priv->png_ptr, priv->info_ptr);
if (setjmp(png_jmpbuf(priv->png_ptr))) {
error(errInternal, -1, "Error during end of write");
return false;
}
return true;
}
#endif
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