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/*
PNGWRAPPER!
This file is included in QuteMol project
as temporary hack waiting for WxWidgets to support
alpha channel in PNG writing.
*/
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <assert.h>
#include <vector>
#include <iostream>
using namespace std;
#include <png.h>
#include "progress.h"
typedef Byte byte;
void downsample2x2(byte * data, int sx, int sy){
int j=0;
for (int y=0; y<sy/2; y++)
for (int x=0; x<sx/2; x++)
for (int c=0; c <4; c++) {
data[j++]=(
int(data[((y*2+0)*sx+(x*2+0))*4+c])+
int(data[((y*2+0)*sx+(x*2+1))*4+c])+
int(data[((y*2+1)*sx+(x*2+0))*4+c])+
int(data[((y*2+1)*sx+(x*2+1))*4+c])+
2
)/4;
}
}
void downsample2x2NoAlpha(byte * data, int sx, int sy){
int j=0;
for (int y=0; y<sy/2; y++)
for (int x=0; x<sx/2; x++)
for (int c=0; c <3; c++) {
data[j++]=(
int(data[((y*2+0)*sx+(x*2+0))*3+c])+
int(data[((y*2+0)*sx+(x*2+1))*3+c])+
int(data[((y*2+1)*sx+(x*2+0))*3+c])+
int(data[((y*2+1)*sx+(x*2+1))*3+c])+
2
)/4;
}
}
void trace(const char *st, const char *st2=NULL){
static FILE *f=NULL;
if (!f) f=fopen("trace.txt","wt");
fprintf(f,st);
if (st2) fprintf(f,st2);
fflush(f);
}
void donttrace(char*x){};
void donttrace( const char*x, const char*y){};
#define TRACE donttrace
//#define TRACE trace
void handle_error(struct png_struct_def *png,const char *error) {
TRACE("Error:\n", error);
}
bool PNGSaveWithAlpha( const char * filename, const byte * const data, int sx, int sy, int reverse ){
int type=4; int depth=8;
assert(filename);
assert(data);
TRACE("Start\n");
FILE *fp;
fp=fopen(filename, "wb+");
if(!fp)
return false;
TRACE("File open (wb+)\n");
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING,
//NULL, NULL, NULL);
NULL, //&handle_error,
&handle_error,
&handle_error);
TRACE("png_create_write\n");
if (png_ptr == NULL) {
fclose(fp);
return false;
}
// Allocate/initialize the image information data. REQUIRED
png_infop png_info_ptr = png_create_info_struct(png_ptr);
TRACE("png_create_info\n");
if (png_info_ptr == NULL) {
fclose(fp);
png_destroy_write_struct(&png_ptr, (png_infopp)NULL);
TRACE("png_destroy_write\n");
return false;
}
png_init_io(png_ptr, fp);
TRACE("png_init_io\n");
//type: 1 -> PNG_COLOR_TYPE_GRAY (bit depths 1, 2, 4, 8, 16)
// 2 -> PNG_COLOR_TYPE_GRAY_ALPHA (bit depths 8, 16)
// 3 -> PNG_COLOR_TYPE_RGB (bit_depths 8, 16)
// 4 -> PNG_COLOR_TYPE_RGB_ALPHA (bit_depths 8, 16)
int pixel_type = 1;
switch(type) {
case 1: pixel_type = PNG_COLOR_TYPE_GRAY; break;
case 2: pixel_type = PNG_COLOR_TYPE_GRAY_ALPHA; break;
case 3: pixel_type = PNG_COLOR_TYPE_RGB; break;
case 4: pixel_type = PNG_COLOR_TYPE_RGB_ALPHA; break;
}
//TRACE("sx %d, sy %d, depth %d, pixel_type %d\n", sx, sy, depth, pixel_type);
png_set_IHDR(png_ptr, png_info_ptr, sx, sy, depth, pixel_type,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
//TRACE("png_set_IHDR\n");
png_write_info(png_ptr, png_info_ptr);
//TRACE("png_write_info\n");
//TRACE("uffa");*/
char **rows = new char *[sy];
for(int i = 0; i < sy; i++)
rows[i] = (char *)data + i * type * (depth/8) * sx;
if(reverse) {
if (sy>200) StartProgress("Saving PNG", sy);
for(int r = sy -1; r >= 0; r--) {
if (r%100) { if (!UpdateProgress(sy-r)) { fclose(fp); return false; } }
png_write_rows(png_ptr, (png_byte **)(&(rows[r])), 1);
}
EndProgress();
} else {
png_write_rows(png_ptr, (png_byte **)(rows), sy);
}
delete []rows;
TRACE("png_write_rows\n");
png_write_end(png_ptr, png_info_ptr);
TRACE("png_write_end\n");
png_destroy_write_struct(&png_ptr, &png_info_ptr);
TRACE("png_destroy_write\n");
fclose(fp);
return true;
}
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