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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>
#include <hugin.hpp>
#include "resource.h"
// http://blog.hammerian.net/2009/reading-png-images-from-memory/
typedef struct {
size_t p;
size_t size;
const char *data;
} data_io_t;
static void dio_reader(png_structp png_ptr, png_bytep buf, png_size_t size)
{
data_io_t *dio = (data_io_t *)png_get_io_ptr(png_ptr);
if(size > dio->size - dio->p) {
png_error(png_ptr, "Could not read bytes.");
}
memcpy(buf, (dio->data + dio->p), size);
dio->p += size;
}
GUI::Image::Image(const char* data, size_t size)
{
row_pointers = NULL;
load(data, size);
}
GUI::Image::Image(std::string filename)
{
row_pointers = NULL;
GUI::Resource rc(filename);
load(rc.data(), rc.size());
}
GUI::Image::~Image()
{
if(!row_pointers) return;
for(unsigned int y = 0; y < h; y++) {
free(row_pointers[y]);
}
free(row_pointers);
}
void GUI::Image::setError(int err)
{
GUI::Resource rc(":png_error");
const char *p = rc.data();
memcpy(&w, p, 4); p += 4;
memcpy(&h, p, 4); p += 4;
DEBUG(image, "w:%d, h:%d\n", w, h);
row_pointers = (png_bytep*)malloc(sizeof(png_bytep) * h);
for(unsigned int y = 0; y < h; y++) {
size_t size = w * sizeof(unsigned int);
DEBUG(image, "rc.size:%d >= p:%d (rowsize: %d)\n",
rc.size(), p - rc.data(), size);
row_pointers[y] = (png_byte*)malloc(size);
memcpy(row_pointers[y], p, size);
p += size;
}
}
void GUI::Image::load(const char* data, size_t size)
{
// Don't ever read image twice.
if(row_pointers) return;
png_structp png_ptr = NULL;
png_infop info_ptr = NULL;
//png_byte color_type;
//png_byte bit_depth;
if(!size) setError(0);
const char *header = data;
// test for it being a png:
if(png_sig_cmp((png_byte*)header, 0, 8)) {
ERR(image, "[read_png_file] File is not recognized as a PNG file");
setError(0);
return;
}
// initialize stuff
png_ptr =
png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) {
ERR(image, "[read_png_file] png_create_read_struct failed");
setError(1);
return;
}
info_ptr = png_create_info_struct(png_ptr);
if(!info_ptr) {
ERR(image, "[read_png_file] png_create_info_struct failed");
setError(2);
png_destroy_read_struct(&png_ptr, NULL, NULL);
return;
}
if(setjmp(png_jmpbuf(png_ptr))) {
ERR(image, "[read_png_file] Error during init_io");
setError(3);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return;
}
//png_init_io(png_ptr, fp);
data_io_t dio;
dio.data = data;
dio.size = size;
dio.p = 8; // skip header
png_set_read_fn(png_ptr, &dio, dio_reader);
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))) {
ERR(image, "[read_png_file] Error during read_image");
setError(4);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
return;
}
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * h);
for(size_t 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);
png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
}
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)
{
if(x > width() || y > height()) return GUI::Colour(0,0,0,0);
png_byte* row = row_pointers[y];
png_byte* ptr = &(row[x*4]);
float r = ptr[0];
float g = ptr[1];
float b = ptr[2];
float a = ptr[3];
GUI::Colour c(r / 255.0,
g / 255.0,
b / 255.0,
a / 255.0);
return c;
}
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