diff options
Diffstat (limited to 'automation')
| -rw-r--r-- | automation/transform_png.c | 176 |
1 files changed, 0 insertions, 176 deletions
diff --git a/automation/transform_png.c b/automation/transform_png.c deleted file mode 100644 index f2b688e..0000000 --- a/automation/transform_png.c +++ /dev/null @@ -1,176 +0,0 @@ -/* - * Copyright 2002-2010 Guillaume Cottenceau. - * - * This software may be freely redistributed under the terms - * of the X11 license. - */ - -#include <unistd.h> -#include <stdlib.h> -#include <stdio.h> -#include <string.h> -#include <stdarg.h> - -#define PNG_DEBUG 3 -#include <png.h> - -void abort_(const char * s, ...) -{ - va_list args; - va_start(args, s); - vfprintf(stderr, s, args); - fprintf(stderr, "\n"); - va_end(args); - abort(); -} - -int x, y; - -int width, height; -png_byte color_type; -png_byte bit_depth; - -png_structp png_ptr; -png_infop info_ptr; -int number_of_passes; -png_bytep * row_pointers; - -void read_png_file(char* file_name) -{ - unsigned char header[8]; // 8 is the maximum size that can be checked - - /* open file and test for it being a png */ - FILE *fp = fopen(file_name, "rb"); - if (!fp) - abort_("[read_png_file] File %s could not be opened for reading", file_name); - fread(header, 1, 8, fp); - if (png_sig_cmp(header, 0, 8)) - abort_("[read_png_file] File %s is not recognized as a PNG file", file_name); - - /* initialize stuff */ - 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"); - - info_ptr = png_create_info_struct(png_ptr); - if (!info_ptr) - abort_("[read_png_file] png_create_info_struct failed"); - - if (setjmp(png_jmpbuf(png_ptr))) - abort_("[read_png_file] Error during init_io"); - - png_init_io(png_ptr, fp); - png_set_sig_bytes(png_ptr, 8); - - png_read_info(png_ptr, info_ptr); - - width = png_get_image_width(png_ptr, info_ptr); - height = png_get_image_height(png_ptr, info_ptr); - color_type = png_get_color_type(png_ptr, info_ptr); - bit_depth = png_get_bit_depth(png_ptr, info_ptr); - - number_of_passes = png_set_interlace_handling(png_ptr); - png_read_update_info(png_ptr, info_ptr); - - /* read file */ - if (setjmp(png_jmpbuf(png_ptr))) - abort_("[read_png_file] Error during read_image"); - - row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height); - for (y=0; y<height; y++) - row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr)); - - png_read_image(png_ptr, row_pointers); - fclose(fp); -} - -void write_png_file(char* file_name) -{ - /* create file */ - FILE *fp = fopen(file_name, "wb"); - if (!fp) - abort_("[write_png_file] File %s could not be opened for writing", file_name); - - /* initialize stuff */ - 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"); - - 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, fp); - - /* write header */ - if (setjmp(png_jmpbuf(png_ptr))) - abort_("[write_png_file] Error during writing header"); - - png_set_IHDR(png_ptr, info_ptr, width, height, - bit_depth, color_type, PNG_INTERLACE_NONE, - PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE); - - png_write_info(png_ptr, info_ptr); - - /* write bytes */ - if (setjmp(png_jmpbuf(png_ptr))) - abort_("[write_png_file] Error during writing bytes"); - - png_write_image(png_ptr, row_pointers); - - /* end write */ - if (setjmp(png_jmpbuf(png_ptr))) - abort_("[write_png_file] Error during end of write"); - - png_write_end(png_ptr, NULL); - - /* cleanup heap allocation */ - for (y=0; y<height; y++) - free(row_pointers[y]); - free(row_pointers); - fclose(fp); -} - -void process_file(void) -{ - if (png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_RGB) - { - abort_("[process_file] input file is PNG_COLOR_TYPE_RGB but must be " - "PNG_COLOR_TYPE_RGBA (lacks the alpha channel)"); - } - - if (png_get_color_type(png_ptr, info_ptr) != PNG_COLOR_TYPE_RGBA) - { - abort_("[process_file] color_type of input file must be " - "PNG_COLOR_TYPE_RGBA (%d) (is %d)", - PNG_COLOR_TYPE_RGBA, png_get_color_type(png_ptr, info_ptr)); - } - - for (y=0; y<height; y++) - { - png_byte* row = row_pointers[y]; - for (x=0; x<width; x++) - { - png_byte* ptr = &(row[x*4]); - printf("Pixel at position [ %d - %d ] has RGBA values: %d - %d - %d - %d\n", - x, y, ptr[0], ptr[1], ptr[2], ptr[3]); - } - } -} - -int main(int argc, char **argv) -{ - if (argc != 3) - abort_("Usage: program_name <file_in> <file_out>"); - - read_png_file(argv[1]); - process_file(); - write_png_file(argv[2]); - - return 0; -} |