1 /*
2 * Copyright 2005-2006 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26 #include "splashscreen_impl.h"
27
28 #include "../libpng/png.h"
29
30 #include <setjmp.h>
31
32 #define SIG_BYTES 8
33
34 void PNGAPI
35 my_png_read_stream(png_structp png_ptr, png_bytep data, png_size_t length)
36 {
37 png_uint_32 check;
38
39 SplashStream * stream = (SplashStream*)png_ptr->io_ptr;
40 check = stream->read(stream, data, length);
41 if (check != length)
42 png_error(png_ptr, "Read Error");
43 }
44
45 int
46 SplashDecodePng(Splash * splash, png_rw_ptr read_func, void *io_ptr)
47 {
48 int stride;
49 ImageFormat srcFormat;
50 png_uint_32 i, rowbytes;
51 png_bytepp row_pointers = NULL;
52 png_bytep image_data = NULL;
53 int success = 0;
54 double gamma;
55
56 png_structp png_ptr = NULL;
57 png_infop info_ptr = NULL;
58
59 png_uint_32 width, height;
60 int bit_depth, color_type;
61
62 ImageRect srcRect, dstRect;
63
64 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
65 if (!png_ptr) {
66 goto done;
67 }
68
69 info_ptr = png_create_info_struct(png_ptr);
70 if (!info_ptr) {
71 goto done;
72 }
73
74 if (setjmp(png_ptr->jmpbuf)) {
75 goto done;
76 }
77
78 png_ptr->io_ptr = io_ptr;
79 png_ptr->read_data_fn = read_func;
80
81 png_set_sig_bytes(png_ptr, SIG_BYTES); /* we already read the 8 signature bytes */
82
83 png_read_info(png_ptr, info_ptr); /* read all PNG info up to image data */
84
85 png_get_IHDR(png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
86 NULL, NULL, NULL);
87
88 /* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
89 * transparency chunks to full alpha channel; strip 16-bit-per-sample
90 * images to 8 bits per sample; and convert grayscale to RGB[A]
91 * this may be sub-optimal but this simplifies implementation */
92
93 png_set_expand(png_ptr);
94 png_set_tRNS_to_alpha(png_ptr);
95 png_set_filler(png_ptr, 0xff, PNG_FILLER_AFTER);
96 png_set_strip_16(png_ptr);
97 png_set_gray_to_rgb(png_ptr);
98
99 if (png_get_gAMA(png_ptr, info_ptr, &gamma))
100 png_set_gamma(png_ptr, 2.2, gamma);
101
102 png_read_update_info(png_ptr, info_ptr);
103
104 rowbytes = png_get_rowbytes(png_ptr, info_ptr);
105
106 if (!SAFE_TO_ALLOC(rowbytes, height)) {
107 goto done;
108 }
109
110 if ((image_data = (unsigned char *) malloc(rowbytes * height)) == NULL) {
111 goto done;
112 }
113
114 if (!SAFE_TO_ALLOC(height, sizeof(png_bytep))) {
115 goto done;
116 }
117 if ((row_pointers = (png_bytepp) malloc(height * sizeof(png_bytep)))
118 == NULL) {
119 goto done;
120 }
121
122 for (i = 0; i < height; ++i)
123 row_pointers[i] = image_data + i * rowbytes;
124
125 png_read_image(png_ptr, row_pointers);
126
127 SplashCleanup(splash);
128
129 splash->width = width;
130 splash->height = height;
131
132 if (!SAFE_TO_ALLOC(splash->width, splash->imageFormat.depthBytes)) {
133 goto done;
134 }
135 stride = splash->width * splash->imageFormat.depthBytes;
136
137 if (!SAFE_TO_ALLOC(splash->height, stride)) {
138 goto done;
139 }
140 splash->frameCount = 1;
141 splash->frames = (SplashImage *)
142 malloc(sizeof(SplashImage) * splash->frameCount);
143
144 if (splash->frames == NULL) {
145 goto done;
146 }
147
148 splash->loopCount = 1;
149 splash->frames[0].bitmapBits = malloc(stride * splash->height);
150 if (splash->frames[0].bitmapBits == NULL) {
151 free(splash->frames);
152 goto done;
153 }
154 splash->frames[0].delay = 0;
155
156 /* FIXME: sort out the real format */
157 initFormat(&srcFormat, 0xFF000000, 0x00FF0000, 0x0000FF00, 0x000000FF);
158 srcFormat.byteOrder = BYTE_ORDER_MSBFIRST;
159
160 initRect(&srcRect, 0, 0, width, height, 1, rowbytes,
161 image_data, &srcFormat);
162 initRect(&dstRect, 0, 0, width, height, 1, stride,
163 splash->frames[0].bitmapBits, &splash->imageFormat);
164 convertRect(&srcRect, &dstRect, CVT_COPY);
165
166 SplashInitFrameShape(splash, 0);
167
168 png_read_end(png_ptr, NULL);
169 success = 1;
170
171 done:
172 free(row_pointers);
173 free(image_data);
174 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
175 return success;
176 }
177
178 int
179 SplashDecodePngStream(Splash * splash, SplashStream * stream)
180 {
181 unsigned char sig[SIG_BYTES];
182 int success = 0;
183
184 stream->read(stream, sig, SIG_BYTES);
185 if (png_sig_cmp(sig, 0, SIG_BYTES)) {
186 goto done;
187 }
188 success = SplashDecodePng(splash, my_png_read_stream, stream);
189
190 done:
191 return success;
192 }