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image.c
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image.c
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/*
* Resine - Fourier-based image resampling library.
* This example code is distributed under no claim of copyright.
*
* image.c - Image I/O functions for the example app.
*/
#include "image.h"
#include <math.h>
#include <stdarg.h>
#include <stdlib.h>
#include <png.h>
#include <jpeglib.h>
void abort_(const char* s, ...) {
va_list args;
va_start(args, s);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
va_end(args);
abort();
}
rsn_image read_png_file(rsn_infop info, const char* filename) {
FILE* f = fopen(filename,"rb");
if(!f) abort_("[read_png_file] File %s could not be opened for reading",filename);
unsigned char header[8];
fread(header,1,8,f);
if(png_sig_cmp(header,0,8)) abort_("[read_png_file] File %s is not recognized as a PNG file",filename);
png_structp png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) abort_("[read_png_file] png_create_read_struct failed");
png_infop info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) {
abort_("[read_png_file] png_create_info_struct failed");
abort(); // This is never touched, it's just to satisfy CSA
}
if(setjmp(png_jmpbuf(png_ptr))) abort_("[read_png_file] Error during init_io");
png_init_io(png_ptr,f);
png_set_sig_bytes(png_ptr,8);
png_read_info(png_ptr,info_ptr);
info->width = png_get_image_width(png_ptr,info_ptr);
info->height = png_get_image_height(png_ptr,info_ptr);
info->channels = png_get_channels(png_ptr, info_ptr);
if(setjmp(png_jmpbuf(png_ptr))) abort_("[read_png_file] Error during read_image");
rsn_image image = malloc(sizeof(rsn_line)*info->height);
png_size_t rowbytes = png_get_rowbytes(png_ptr,info_ptr);
for(int y = 0; y < info->height; y++)
image[y] = malloc(rowbytes);
png_read_image(png_ptr,image);
png_infop end_ptr = png_create_info_struct(png_ptr);
png_read_end(png_ptr, end_ptr);
fclose(f);
png_destroy_read_struct(&png_ptr,&info_ptr,&end_ptr);
png_destroy_info_struct(png_ptr,&info_ptr);
return image;
}
rsn_image read_jpeg_file(rsn_infop info,const char* filename) {
FILE* f = fopen(filename,"rb");
if(!f) abort_("Error opening jpeg file %s\n!",filename);
struct jpeg_decompress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_decompress(&cinfo);
jpeg_stdio_src(&cinfo,f);
jpeg_read_header(&cinfo,TRUE);
jpeg_start_decompress(&cinfo);
info->width = cinfo.output_width;
info->height = cinfo.output_height;
info->channels = cinfo.num_components;
rsn_image image = malloc(sizeof(rsn_line)*info->height);
for(int y = 0; cinfo.output_scanline < info->height; y++) {
image[y] = malloc(sizeof(rsn_pel)*info->width*info->channels);
jpeg_read_scanlines(&cinfo,&image[y],1);
}
jpeg_finish_decompress(&cinfo);
jpeg_destroy_decompress(&cinfo);
fclose(f);
return image;
}
void write_png_file(rsn_info info,const char* filename, rsn_image image) {
FILE *f = fopen(filename, "wb");
if(!f) abort_("[write_png_file] File %s could not be opened for writing", filename);
png_structp png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) abort_("[write_png_file] png_create_write_struct failed");
png_infop info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) abort_("[write_png_file] png_create_info_struct failed");
if(setjmp(png_jmpbuf(png_ptr))) abort_("[write_png_file] Error during init_io");
png_init_io(png_ptr,f);
if(setjmp(png_jmpbuf(png_ptr))) abort_("[write_png_file] Error during writing header");
int ocsp;
if(!(info.channels % 2)) ocsp = (info.channels - 2) | PNG_COLOR_MASK_ALPHA;
else ocsp = info.channels - 1;
png_set_IHDR(png_ptr,info_ptr,info.width_s,info.height_s,8,ocsp,PNG_INTERLACE_NONE,PNG_COMPRESSION_TYPE_DEFAULT,PNG_FILTER_TYPE_BASE);
png_write_info(png_ptr,info_ptr);
if(setjmp(png_jmpbuf(png_ptr))) abort_("[write_png_file] Error during writing bytes");
png_write_image(png_ptr,image);
if(setjmp(png_jmpbuf(png_ptr))) abort_("[write_png_file] Error during end of write");
png_write_end(png_ptr,NULL);
fclose(f);
png_destroy_write_struct(&png_ptr,&info_ptr);
png_destroy_info_struct(png_ptr,&info_ptr);
}
void write_jpeg_file(rsn_info info, const char* filename, rsn_image image, int quality) {
FILE* f = fopen(filename,"wb");
if(!f) abort_("Error opening output jpeg file %s\n!",filename);
struct jpeg_compress_struct cinfo;
struct jpeg_error_mgr jerr;
cinfo.err = jpeg_std_error(&jerr);
jpeg_create_compress(&cinfo);
jpeg_stdio_dest(&cinfo,f);
cinfo.image_width = info.width_s;
cinfo.image_height = info.height_s;
cinfo.input_components = info.channels;
cinfo.in_color_space = (int)ceil(info.channels/2.f);
jpeg_set_defaults(&cinfo);
jpeg_set_quality(&cinfo,quality,TRUE);
jpeg_start_compress(&cinfo,TRUE);
for(int y = 0; cinfo.next_scanline < info.height_s; y++)
jpeg_write_scanlines(&cinfo,&image[y],1);
jpeg_finish_compress(&cinfo);
jpeg_destroy_compress(&cinfo);
fclose(f);
}