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// ==============================================================
// This file is part of Glest Shared Library (www.glest.org)
//
// Copyright (C) 2001-2010 Martiño Figueroa and others
//
// You can redistribute this code 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
// ==============================================================
#include "PNGReader.h"
#include "data_types.h"
#include "pixmap.h"
#include <stdexcept>
#include <png.h>
#include <setjmp.h>
#include "util.h"
#include "leak_dumper.h"
using std::runtime_error;
using std::ios;
namespace Shared{ namespace Graphics{
// =====================================================
// Callbacks for PNG-decompression
// =====================================================
static void user_read_data(png_structp read_ptr, png_bytep data, png_size_t length) {
ifstream& is = *((ifstream*)png_get_io_ptr(read_ptr));
is.read((char*)data,(std::streamsize)length);
static bool bigEndianSystem = Shared::PlatformByteOrder::isBigEndian();
if(bigEndianSystem == true) {
Shared::PlatformByteOrder::fromEndianTypeArray<png_byte>(data,length);
}
if (!is.good()) {
png_error(read_ptr,"Could not read from png-file");
}
}
//static void user_write_data(png_structp png_ptr, png_bytep data, png_size_t length) {}
//static void user_flush_data(png_structp png_ptr) {}
/**Get Extension array, initialised*/
//static inline const string* getExtensionsPng() {
static inline std::vector<string> getExtensionsPng() {
//static const string extensions[] = {"png", ""};
static std::vector<string> extensions;
if(extensions.empty() == true) {
extensions.push_back("png");
}
return extensions;
}
// =====================================================
// class PNGReader
// =====================================================
PNGReader::PNGReader(): FileReader<Pixmap2D>(getExtensionsPng()) {}
Pixmap2D* PNGReader::read(ifstream& is, const string& path, Pixmap2D* ret) const {
if(GlobalStaticFlags::getIsNonGraphicalModeEnabled() == true) {
throw megaglest_runtime_error("Loading graphics in headless server mode not allowed!");
}
//Read file
is.seekg(0, ios::end);
//size_t length = is.tellg();
is.seekg(0, ios::beg);
uint8 *buffer = new uint8[8];
is.read((char*)buffer, 8);
static bool bigEndianSystem = Shared::PlatformByteOrder::isBigEndian();
if(bigEndianSystem == true) {
Shared::PlatformByteOrder::fromEndianTypeArray<uint8>(buffer,8);
}
if (png_sig_cmp(buffer, 0, 8) != 0) {
delete [] buffer;
//This is not a PNG file - could be used for fast checking whether file is supported or not
throw megaglest_runtime_error(path +" is not a png",true);
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
delete [] buffer;
throw megaglest_runtime_error(path +" is a corrupt(1) png",true);
}
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);
delete [] buffer;
throw megaglest_runtime_error(path +" is a corrupt(2) png",true);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr,(png_infopp)NULL);
delete [] buffer;
//Error during init_io
throw megaglest_runtime_error(path +" is a corrupt(3) png",true);
}
png_set_read_fn(png_ptr, &is, user_read_data);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
int width = png_get_image_width(png_ptr,info_ptr);
int height = png_get_image_height(png_ptr,info_ptr);
int color_type = png_get_color_type(png_ptr,info_ptr);
//int bit_depth = info_ptr->bit_depth;
//We want RGB, 24 bit
if (color_type == PNG_COLOR_TYPE_PALETTE ||
(color_type == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(png_ptr,info_ptr) < 8) ||
(png_get_valid(png_ptr, info_ptr,PNG_INFO_tRNS))) {
png_set_expand(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_GRAY) {
png_set_gray_to_rgb(png_ptr);
}
//int number_of_passes = png_set_interlace_handling(png_ptr);
png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
png_bytep* row_pointers = new png_bytep[height];
if (setjmp(png_jmpbuf(png_ptr))) {
delete[] row_pointers;
delete [] buffer;
//error during read_image
throw megaglest_runtime_error(path +" is a corrupt(4) png",true);
}
for (int y = 0; y < height; ++y) {
row_pointers[y] = new png_byte[png_get_rowbytes(png_ptr, info_ptr)];
}
png_read_image(png_ptr, row_pointers);
size_t fileComponents = png_get_rowbytes(png_ptr, info_ptr)/width;
size_t picComponents = (ret->getComponents()==-1)?fileComponents:ret->getComponents();
//std::cout << "PNG-Components: Pic: " << picComponents << " old: " << (ret->getComponents()) << " File: " << fileComponents << std::endl;
//picComponents = 4;
//Copy image
ret->init(width,height,(int)picComponents);
uint8* pixels = ret->getPixels();
const size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
size_t location = 0;
for (int y = height-1; y >= 0; --y) { //you have to somehow invert the lines
if (picComponents == fileComponents) {
memcpy(pixels+location,row_pointers[y],rowbytes);
} else {
int r,g,b,a,l;
for (size_t xPic = 0, xFile = 0; xFile < rowbytes; xPic+= picComponents, xFile+= fileComponents) {
switch(fileComponents) {
case 3:
r = row_pointers[y][xFile];
g = row_pointers[y][xFile+1];
b = row_pointers[y][xFile+2];
l = (r+g+b+2)/3;
a = 255;
break;
case 4:
r = row_pointers[y][xFile];
g = row_pointers[y][xFile+1];
b = row_pointers[y][xFile+2];
l = (r+g+b+2)/3;
a = row_pointers[y][xFile+3];
break;
default:
// Possible Error
case 1:
r = g = b = l = row_pointers[y][xFile];
a = 255;
break;
}
switch (picComponents) {
case 1:
pixels[location+xPic] = l;
break;
case 4:
pixels[location+xPic+3] = a; //Next case
case 3:
pixels[location+xPic] = r;
pixels[location+xPic+1] = g;
pixels[location+xPic+2] = b;
break;
default:
//just so at least something works
for (unsigned int i = 0; i < picComponents; ++i) {
pixels[location+xPic+i] = l;
}
break;
// Possible Error
}
}
}
location += picComponents * width;
}
for (int y = 0; y < height; ++y) {
delete [] row_pointers[y];
}
delete[] row_pointers;
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
delete [] buffer;
return ret;
}
PNGReader3D::PNGReader3D(): FileReader<Pixmap3D>(getExtensionsPng()) {}
Pixmap3D* PNGReader3D::read(ifstream& is, const string& path, Pixmap3D* ret) const {
//Read file
is.seekg(0, ios::end);
//size_t length = is.tellg();
is.seekg(0, ios::beg);
uint8 *buffer = new uint8[8];
is.read((char*)buffer, 8);
static bool bigEndianSystem = Shared::PlatformByteOrder::isBigEndian();
if(bigEndianSystem == true) {
Shared::PlatformByteOrder::fromEndianTypeArray<uint8>(buffer,8);
}
if (png_sig_cmp(buffer, 0, 8) != 0) {
delete [] buffer;
//This is not a PNG file - could be used for fast checking whether file is supported or not
throw megaglest_runtime_error(path +" is not a png(2)",true);
}
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!png_ptr) {
delete [] buffer;
throw megaglest_runtime_error(path +" is a corrupt(5) png",true);
}
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);
delete [] buffer;
throw megaglest_runtime_error(path +" is a corrupt(6) png",true);
}
if (setjmp(png_jmpbuf(png_ptr))) {
png_destroy_read_struct(&png_ptr, &info_ptr,(png_infopp)NULL);
delete [] buffer;
//Error during init_io
throw megaglest_runtime_error(path +" is a corrupt(7) png",true);
}
png_set_read_fn(png_ptr, &is, user_read_data);
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
int width = png_get_image_width(png_ptr,info_ptr);
int height = png_get_image_height(png_ptr,info_ptr);
int color_type = png_get_color_type(png_ptr,info_ptr);
//int bit_depth = info_ptr->bit_depth;
//We want RGB, 24 bit
if (color_type == PNG_COLOR_TYPE_PALETTE ||
(color_type == PNG_COLOR_TYPE_GRAY && png_get_bit_depth(png_ptr,info_ptr) < 8) ||
(png_get_valid(png_ptr, info_ptr,PNG_INFO_tRNS))) {
png_set_expand(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_GRAY) {
png_set_gray_to_rgb(png_ptr);
}
//int number_of_passes = png_set_interlace_handling(png_ptr);
png_set_interlace_handling(png_ptr);
png_read_update_info(png_ptr, info_ptr);
png_bytep* row_pointers = new png_bytep[height];
if (setjmp(png_jmpbuf(png_ptr))) {
delete[] row_pointers;
delete [] buffer;
//error during read_image
throw megaglest_runtime_error(path +" is a corrupt(8) png",true);
}
for (int y = 0; y < height; ++y) {
row_pointers[y] = new png_byte[png_get_rowbytes(png_ptr, info_ptr)];
}
png_read_image(png_ptr, row_pointers);
size_t fileComponents = png_get_rowbytes(png_ptr, info_ptr)/width;
size_t picComponents = (ret->getComponents()==-1)?fileComponents:ret->getComponents();
const int d = ret->getD();
const int slice = ret->getSlice();
if(ret->getPixels() == NULL){
ret->init(width,height,d, (int)picComponents);
}
//std::cout << "PNG-Components: Pic: " << picComponents << " old: " << (ret->getComponents()) << " File: " << fileComponents << std::endl;
//picComponents = 4;
//Copy image
//printf("pixmap3d loading path [%s] w = %d h = %d d = %d comp = %d\n",path.c_str(),width,height,ret->getD(),picComponents);
uint8* pixels = ret->getPixels();
if(slice > 0) {
pixels = &pixels[slice*width*height*picComponents];
}
const size_t rowbytes = png_get_rowbytes(png_ptr, info_ptr);
size_t location = 0;
for (int y = height-1; y >= 0; --y) { //you have to somehow invert the lines
if (picComponents == fileComponents) {
memcpy(pixels+location,row_pointers[y],rowbytes);
} else {
int r,g,b,a,l;
for (size_t xPic = 0, xFile = 0; xFile < rowbytes; xPic+= picComponents, xFile+= fileComponents) {
switch(fileComponents) {
case 3:
r = row_pointers[y][xFile];
g = row_pointers[y][xFile+1];
b = row_pointers[y][xFile+2];
l = (r+g+b+2)/3;
a = 255;
break;
case 4:
r = row_pointers[y][xFile];
g = row_pointers[y][xFile+1];
b = row_pointers[y][xFile+2];
l = (r+g+b+2)/3;
a = row_pointers[y][xFile+3];
break;
default:
// Possible Error
case 1:
r = g = b = l = row_pointers[y][xFile];
a = 255;
break;
}
switch (picComponents) {
case 1:
pixels[location+xPic] = l;
break;
case 4:
pixels[location+xPic+3] = a; //Next case
case 3:
pixels[location+xPic] = r;
pixels[location+xPic+1] = g;
pixels[location+xPic+2] = b;
break;
default:
//just so at least something works
for (unsigned int i = 0; i < picComponents; ++i) {
pixels[location+xPic+i] = l;
}
break;
// Possible Error
}
}
}
location += picComponents * width;
}
for (int y = 0; y < height; ++y) {
delete [] row_pointers[y];
}
delete[] row_pointers;
png_destroy_read_struct(&png_ptr, &info_ptr, (png_infopp)NULL);
delete [] buffer;
return ret;
}
}} //end namespace
|
