1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* -*- 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;
}
|
