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// pngCanvas.cpp
// Context Free
// ---------------------
// Copyright (C) 2005-2007 Mark Lentczner - markl@glyphic.com
// Copyright (C) 2007-2013 John Horigan - john@glyphic.com
//
// This program 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 program 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.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// Mark Lentczner can be contacted at markl@glyphic.com or at
// Mark Lentczner, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
// John Horigan can be contacted at john@glyphic.com or at
// John Horigan, 1209 Villa St., Mountain View, CA 94041-1123, USA
//
//
#include "pngCanvas.h"
#include "png.h"
#include <cstdlib>
#include <cstring>
#include <cstdio>
#include <iostream>
#include <arpa/inet.h>
#include "prettyint.h"
#include <unistd.h>
using std::cerr;
using std::endl;
namespace {
void
pngWriteError(png_structp, png_const_charp message)
{
cerr << message << endl;
throw false;
}
void
pngWriteWarning(png_structp, png_const_charp message)
{
cerr << message << endl;
}
}
namespace {
struct FileCloser
{
void operator()(std::FILE* ptr) const {
if (ptr != stdout)
std::fclose(ptr); // Not called if nullptr
}
};
}
void pngCanvas::output(const char* outfilename, int frame)
{
std::unique_ptr<std::FILE, FileCloser> out;
png_structp png_ptr = nullptr;
png_infop info_ptr = nullptr;
std::unique_ptr<png_byte[]> row;
std::unique_ptr<png_uint_16[]> row16;
if (mPixelFormat & Has_16bit_Color)
row16 = std::make_unique<png_uint_16[]>(mStride);
else
row = std::make_unique<png_byte[]>(mStride);
try {
png_ptr = png_create_write_struct(
PNG_LIBPNG_VER_STRING,
0, pngWriteError, pngWriteWarning);
if (!png_ptr) throw "couldn't create png write struct";
info_ptr = png_create_info_struct(png_ptr);
if (!info_ptr) throw "couldn't create png info struct";
if (*outfilename || usetmpfile) {
if (usetmpfile) {
mFileName = "/tmp/cfdg_temp_image_XXXXXX.png";
int fd = mkstemps(&mFileName[0], 4);
if (fd != -1)
out.reset(fdopen(fd, "w"));
} else {
out.reset(std::fopen(outfilename, "wb"));
}
} else {
out.reset(stdout);
#ifdef WIN32
setmode(fileno(stdout), O_BINARY);
#endif
}
if (!out) {
cerr << "Couldn't open " << outfilename << "\n";
throw false;
}
if (setjmp(png_jmpbuf(png_ptr)))
throw "Unspecified PNG output failure.";
png_init_io(png_ptr, out.get());
int pngFormat;
switch (mPixelFormat) {
case aggCanvas::RGBA8_Blend:
case aggCanvas::RGBA16_Blend:
case aggCanvas::RGBA8_Custom_Blend:
case aggCanvas::RGBA16_Custom_Blend:
pngFormat = PNG_COLOR_TYPE_RGB_ALPHA;
break;
case aggCanvas::RGB8_Blend:
case aggCanvas::RGB16_Blend:
pngFormat = PNG_COLOR_TYPE_RGB;
break;
case aggCanvas::Gray8_Blend:
case aggCanvas::Gray16_Blend:
pngFormat = PNG_COLOR_TYPE_GRAY;
break;
default:
throw "Unknown pixel format";
}
int width = mFullWidth;
int height = mFullHeight;
int srcx = 0;
int srcy = 0;
if (mCrop) {
width = cropWidth();
height = cropHeight();
srcx = cropX();
srcy = cropY();
}
if (frame == -1 && !mQuiet) {
cerr << endl << "Writing "
<< prettyInt(static_cast<unsigned long>(width)) << "w x "
<< prettyInt(static_cast<unsigned long>(height)) << "h pixel image..." << endl;
}
png_set_IHDR(png_ptr, info_ptr,
width, height, (mPixelFormat & Has_16bit_Color) + 8, pngFormat,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
char myKey[] = "Software", myValue[] = "Context Free";
png_text comments[1];
std::memset(comments, 0, sizeof(comments));
comments[0].compression = PNG_TEXT_COMPRESSION_NONE;
comments[0].key = myKey;
comments[0].text = myValue;
comments[0].text_length = strlen(comments[0].text);
png_set_text(png_ptr, info_ptr,
comments, sizeof(comments)/sizeof(comments[0]));
png_write_info(png_ptr, info_ptr);
png_bytep rowPtr = mData.data() + srcy * mStride + srcx * aggCanvas::BytesPerPixel.at(mPixelFormat);
for (int r = 0; r < height; ++r) {
if (mPixelFormat == aggCanvas::RGBA8_Blend || mPixelFormat == aggCanvas::RGBA8_Custom_Blend) {
// Convert each row to non-premultiplied alpha as per PNG spec
// This is done in a separate array instead of in-situ because
// for animations the main buffer might be drawn into again
for (int c = 0; c < width * 4; c += 4) {
agg::rgba8 pix(rowPtr[c + 0], rowPtr[c + 1], rowPtr[c + 2], rowPtr[c + 3]);
pix.demultiply();
row[c + 0] = pix.r;
row[c + 1] = pix.g;
row[c + 2] = pix.b;
row[c + 3] = pix.a;
}
png_write_row(png_ptr, row.get());
} else if (mPixelFormat == aggCanvas::RGBA16_Blend || mPixelFormat == aggCanvas::RGBA16_Custom_Blend) {
// Ditto for rgba16
png_uint_16p rowPtr16 = reinterpret_cast<png_uint_16p>(rowPtr);
for (int c = 0; c < width * 4; c += 4) {
agg::rgba16 pix(rowPtr16[c + 0], rowPtr16[c + 1], rowPtr16[c + 2], rowPtr16[c + 3]);
pix.demultiply();
row16[c + 0] = htons(pix.r); // Also convert to network byte order
row16[c + 1] = htons(pix.g);
row16[c + 2] = htons(pix.b);
row16[c + 3] = htons(pix.a);
}
png_write_row(png_ptr, reinterpret_cast<png_bytep>(row16.get()));
} else if (mPixelFormat & Has_16bit_Color) {
// Convert rgb16/gray16 to network byte order
png_uint_16p rowPtr16 = reinterpret_cast<png_uint_16p>(rowPtr);
for (int c = 0; c < width * (BytesPerPixel.at(mPixelFormat) >> 1); ++c)
row16[c] = htons(rowPtr16[c]);
png_write_row(png_ptr, reinterpret_cast<png_bytep>(row16.get()));
} else {
png_write_row(png_ptr, rowPtr);
}
rowPtr += mStride;
}
png_write_end(png_ptr, 0);
}
catch (const char* msg) {
cerr << "***" << msg << endl;
}
catch (bool) { }
if (png_ptr) png_destroy_write_struct(&png_ptr, &info_ptr);
}
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