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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* image.cc
*
* Sat Mar 16 15:05:09 CET 2013
* Copyright 2013 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo 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.
*
* DrumGizmo 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 DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "image.h"
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
void abort_(const char * s, ...)
{
va_list args;
va_start(args, s);
vfprintf(stderr, s, args);
fprintf(stderr, "\n");
va_end(args);
abort();
}
GUI::Image::Image(const char* data, size_t size)
{
}
GUI::Image::Image(std::string filename)
{
char header[8]; // 8 is the maximum size that can be checked
/* open file and test for it being a png */
FILE *fp = fopen(filename.c_str(), "rb");
if (!fp)
abort_("[read_png_file] File %s could not be opened for reading",
filename.c_str());
size_t r = fread(header, 1, 8, fp);
(void)r;
if(png_sig_cmp((const png_byte*)header, 0, 8)) {
abort_("[read_png_file] File %s is not recognized as a PNG file",
filename.c_str());
}
/* 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);
w = png_get_image_width(png_ptr, info_ptr);
h = 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) * h);
size_t y;
for(y = 0; y < h; y++) {
row_pointers[y] = (png_byte*) malloc(png_get_rowbytes(png_ptr,info_ptr));
}
png_read_image(png_ptr, row_pointers);
fclose(fp);
}
#if 0
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));
}
size_t x, y;
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]);
/* set red value to 0 and green value to the blue one */
ptr[0] = 0;
ptr[1] = ptr[2];
}
}
}
#endif
GUI::Image::~Image()
{
}
size_t GUI::Image::width()
{
return w;
}
size_t GUI::Image::height()
{
return h;
}
GUI::Colour GUI::Image::getPixel(size_t x, size_t y)
{
png_byte* row = row_pointers[y];
png_byte* ptr = &(row[x*4]);
GUI::Colour c(ptr[0], ptr[1], ptr[2], ptr[3]);
return c;
}
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