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
|
/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
// Disable symbol overrides so that we can use system headers.
#define FORBIDDEN_SYMBOL_ALLOW_ALL
#include "common/scummsys.h"
#include "common/stream.h"
#include "backends/platform/psp/psppixelformat.h"
#include "backends/platform/psp/display_client.h"
#include "backends/platform/psp/png_loader.h"
//#define __PSP_DEBUG_FUNCS__ /* For debugging function calls */
//#define __PSP_DEBUG_PRINT__ /* For debug printouts */
#include "backends/platform/psp/trace.h"
PngLoader::Status PngLoader::allocate() {
DEBUG_ENTER_FUNC();
if (!findImageDimensions()) {
PSP_ERROR("failed to get image dimensions\n");
return BAD_FILE;
}
_buffer->setSize(_width, _height, _sizeBy);
uint32 bitsPerPixel = _bitDepth * _channels;
if (_paletteSize) { // 8 or 4-bit image
if (bitsPerPixel == 4) {
_buffer->setPixelFormat(PSPPixelFormat::Type_Palette_4bit);
_palette->setPixelFormats(PSPPixelFormat::Type_4444, PSPPixelFormat::Type_Palette_4bit);
_paletteSize = 16; // round up
} else if (bitsPerPixel == 8) { // 8-bit image
_buffer->setPixelFormat(PSPPixelFormat::Type_Palette_8bit);
_palette->setPixelFormats(PSPPixelFormat::Type_4444, PSPPixelFormat::Type_Palette_8bit);
_paletteSize = 256; // round up
} else {
PSP_ERROR("too many bits per pixel[%d] for a palette\n", bitsPerPixel);
return BAD_FILE;
}
} else { // 32-bit image
_buffer->setPixelFormat(PSPPixelFormat::Type_8888);
}
if (!_buffer->allocate()) {
PSP_ERROR("failed to allocate buffer\n");
return OUT_OF_MEMORY;
}
if (_buffer->hasPalette() && !_palette->allocate()) {
PSP_ERROR("failed to allocate palette\n");
return OUT_OF_MEMORY;
}
return OK;
}
bool PngLoader::load() {
DEBUG_ENTER_FUNC();
// Try to load the image
_file->seek(0); // Go back to start
if (!loadImageIntoBuffer()) {
PSP_DEBUG_PRINT("failed to load image\n");
return false;
}
PSP_DEBUG_PRINT("succeded in loading image\n");
if (_paletteSize == 16) // 4-bit
_buffer->flipNibbles(); // required because of PNG 4-bit format
return true;
}
void PngLoader::warningFn(png_structp png_ptr, png_const_charp warning_msg) {
// ignore PNG warnings
}
// Read function for png library to be able to read from our SeekableReadStream
//
void PngLoader::libReadFunc(png_structp pngPtr, png_bytep data, png_size_t length) {
Common::SeekableReadStream *file;
file = (Common::SeekableReadStream *)pngPtr->io_ptr;
file->read(data, length);
}
bool PngLoader::basicImageLoad() {
DEBUG_ENTER_FUNC();
_pngPtr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if (!_pngPtr)
return false;
png_set_error_fn(_pngPtr, (png_voidp) NULL, (png_error_ptr) NULL, warningFn);
_infoPtr = png_create_info_struct(_pngPtr);
if (!_infoPtr) {
png_destroy_read_struct(&_pngPtr, png_infopp_NULL, png_infopp_NULL);
return false;
}
// Set the png lib to use our read function
png_set_read_fn(_pngPtr, (void *)_file, libReadFunc);
unsigned int sig_read = 0;
png_set_sig_bytes(_pngPtr, sig_read);
png_read_info(_pngPtr, _infoPtr);
int interlaceType;
png_get_IHDR(_pngPtr, _infoPtr, (png_uint_32 *)&_width, (png_uint_32 *)&_height, &_bitDepth,
&_colorType, &interlaceType, int_p_NULL, int_p_NULL);
_channels = png_get_channels(_pngPtr, _infoPtr);
if (_colorType & PNG_COLOR_MASK_PALETTE)
_paletteSize = _infoPtr->num_palette;
return true;
}
/* Get the width and height of a png image */
bool PngLoader::findImageDimensions() {
DEBUG_ENTER_FUNC();
bool status = basicImageLoad();
PSP_DEBUG_PRINT("width[%d], height[%d], paletteSize[%d], bitDepth[%d], channels[%d], rowBytes[%d]\n", _width, _height, _paletteSize, _bitDepth, _channels, _infoPtr->rowbytes);
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return status;
}
//
// Load a texture from a png image
//
bool PngLoader::loadImageIntoBuffer() {
DEBUG_ENTER_FUNC();
if (!basicImageLoad()) {
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return false;
}
png_set_strip_16(_pngPtr); // Strip off 16 bit channels in case they occur
if (_paletteSize) {
// Copy the palette
png_colorp srcPal = _infoPtr->palette;
for (int i = 0; i < _infoPtr->num_palette; i++) {
unsigned char alphaVal = (i < _infoPtr->num_trans) ? _infoPtr->trans[i] : 0xFF; // Load alpha if it's there
_palette->setSingleColorRGBA(i, srcPal->red, srcPal->green, srcPal->blue, alphaVal);
srcPal++;
}
} else { // Not a palettized image
if (_colorType == PNG_COLOR_TYPE_GRAY && _bitDepth < 8)
png_set_gray_1_2_4_to_8(_pngPtr); // Round up grayscale images
if (png_get_valid(_pngPtr, _infoPtr, PNG_INFO_tRNS))
png_set_tRNS_to_alpha(_pngPtr); // Convert trans channel to alpha for 32 bits
png_set_add_alpha(_pngPtr, 0xff, PNG_FILLER_AFTER); // Filler for alpha if none exists
}
uint32 rowBytes = png_get_rowbytes(_pngPtr, _infoPtr);
// there seems to be a bug in libpng where it doesn't increase the rowbytes or the
// channel even after we add the alpha channel
if (_channels == 3 && (rowBytes / _width) == 3) {
_channels = 4;
rowBytes = _width * _channels;
}
PSP_DEBUG_PRINT("rowBytes[%d], channels[%d]\n", rowBytes, _channels);
unsigned char *line = (unsigned char*) malloc(rowBytes);
if (!line) {
png_destroy_read_struct(&_pngPtr, png_infopp_NULL, png_infopp_NULL);
PSP_ERROR("Couldn't allocate line\n");
return false;
}
for (size_t y = 0; y < _height; y++) {
png_read_row(_pngPtr, line, png_bytep_NULL);
_buffer->copyFromRect(line, rowBytes, 0, y, _width, 1); // Copy into buffer
}
free(line);
png_read_end(_pngPtr, _infoPtr);
png_destroy_read_struct(&_pngPtr, &_infoPtr, png_infopp_NULL);
return true;
}
|
