1 /*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdlib.h>
18 #include <unistd.h>
19
20 #include <fcntl.h>
21 #include <stdio.h>
22
23 #include <sys/ioctl.h>
24 #include <sys/mman.h>
25 #include <sys/types.h>
26
27 #include <linux/fb.h>
28 #include <linux/kd.h>
29
30 #include <pixelflinger/pixelflinger.h>
31
32 #include <png.h>
33
34 #include "minui.h"
35
36 // libpng gives "undefined reference to 'pow'" errors, and I have no
37 // idea how to convince the build system to link with -lm. We don't
38 // need this functionality (it's used for gamma adjustment) so provide
39 // a dummy implementation to satisfy the linker.
pow(double x,double y)40 double pow(double x, double y) {
41 return x;
42 }
43
res_create_surface(const char * name,gr_surface * pSurface)44 int res_create_surface(const char* name, gr_surface* pSurface) {
45 char resPath[256];
46 GGLSurface* surface = NULL;
47 int result = 0;
48 unsigned char header[8];
49 png_structp png_ptr = NULL;
50 png_infop info_ptr = NULL;
51
52 snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
53 resPath[sizeof(resPath)-1] = '\0';
54 FILE* fp = fopen(resPath, "rb");
55 if (fp == NULL) {
56 result = -1;
57 goto exit;
58 }
59
60 size_t bytesRead = fread(header, 1, sizeof(header), fp);
61 if (bytesRead != sizeof(header)) {
62 result = -2;
63 goto exit;
64 }
65
66 if (png_sig_cmp(header, 0, sizeof(header))) {
67 result = -3;
68 goto exit;
69 }
70
71 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
72 if (!png_ptr) {
73 result = -4;
74 goto exit;
75 }
76
77 info_ptr = png_create_info_struct(png_ptr);
78 if (!info_ptr) {
79 result = -5;
80 goto exit;
81 }
82
83 if (setjmp(png_jmpbuf(png_ptr))) {
84 result = -6;
85 goto exit;
86 }
87
88 png_init_io(png_ptr, fp);
89 png_set_sig_bytes(png_ptr, sizeof(header));
90 png_read_info(png_ptr, info_ptr);
91
92 size_t width = info_ptr->width;
93 size_t height = info_ptr->height;
94 size_t stride = 4 * width;
95 size_t pixelSize = stride * height;
96
97 int color_type = info_ptr->color_type;
98 int bit_depth = info_ptr->bit_depth;
99 int channels = info_ptr->channels;
100 if (bit_depth != 8 || (channels != 3 && channels != 4) ||
101 (color_type != PNG_COLOR_TYPE_RGB &&
102 color_type != PNG_COLOR_TYPE_RGBA)) {
103 return -7;
104 goto exit;
105 }
106
107 surface = malloc(sizeof(GGLSurface) + pixelSize);
108 if (surface == NULL) {
109 result = -8;
110 goto exit;
111 }
112 unsigned char* pData = (unsigned char*) (surface + 1);
113 surface->version = sizeof(GGLSurface);
114 surface->width = width;
115 surface->height = height;
116 surface->stride = width; /* Yes, pixels, not bytes */
117 surface->data = pData;
118 surface->format = (channels == 3) ?
119 GGL_PIXEL_FORMAT_RGBX_8888 : GGL_PIXEL_FORMAT_RGBA_8888;
120
121 int y;
122 if (channels == 3) {
123 for (y = 0; y < height; ++y) {
124 unsigned char* pRow = pData + y * stride;
125 png_read_row(png_ptr, pRow, NULL);
126
127 int x;
128 for(x = width - 1; x >= 0; x--) {
129 int sx = x * 3;
130 int dx = x * 4;
131 unsigned char r = pRow[sx];
132 unsigned char g = pRow[sx + 1];
133 unsigned char b = pRow[sx + 2];
134 unsigned char a = 0xff;
135 pRow[dx ] = r; // r
136 pRow[dx + 1] = g; // g
137 pRow[dx + 2] = b; // b
138 pRow[dx + 3] = a;
139 }
140 }
141 } else {
142 for (y = 0; y < height; ++y) {
143 unsigned char* pRow = pData + y * stride;
144 png_read_row(png_ptr, pRow, NULL);
145 }
146 }
147
148 *pSurface = (gr_surface) surface;
149
150 exit:
151 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
152
153 if (fp != NULL) {
154 fclose(fp);
155 }
156 if (result < 0) {
157 if (surface) {
158 free(surface);
159 }
160 }
161 return result;
162 }
163
res_free_surface(gr_surface surface)164 void res_free_surface(gr_surface surface) {
165 GGLSurface* pSurface = (GGLSurface*) surface;
166 if (pSurface) {
167 free(pSurface);
168 }
169 }
170