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 *pSurface = NULL;
53
54 snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
55 resPath[sizeof(resPath)-1] = '\0';
56 FILE* fp = fopen(resPath, "rb");
57 if (fp == NULL) {
58 result = -1;
59 goto exit;
60 }
61
62 size_t bytesRead = fread(header, 1, sizeof(header), fp);
63 if (bytesRead != sizeof(header)) {
64 result = -2;
65 goto exit;
66 }
67
68 if (png_sig_cmp(header, 0, sizeof(header))) {
69 result = -3;
70 goto exit;
71 }
72
73 png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
74 if (!png_ptr) {
75 result = -4;
76 goto exit;
77 }
78
79 info_ptr = png_create_info_struct(png_ptr);
80 if (!info_ptr) {
81 result = -5;
82 goto exit;
83 }
84
85 if (setjmp(png_jmpbuf(png_ptr))) {
86 result = -6;
87 goto exit;
88 }
89
90 png_init_io(png_ptr, fp);
91 png_set_sig_bytes(png_ptr, sizeof(header));
92 png_read_info(png_ptr, info_ptr);
93
94 size_t width = info_ptr->width;
95 size_t height = info_ptr->height;
96 size_t stride = 4 * width;
97 size_t pixelSize = stride * height;
98
99 int color_type = info_ptr->color_type;
100 int bit_depth = info_ptr->bit_depth;
101 int channels = info_ptr->channels;
102 if (!(bit_depth == 8 &&
103 ((channels == 3 && color_type == PNG_COLOR_TYPE_RGB) ||
104 (channels == 4 && color_type == PNG_COLOR_TYPE_RGBA) ||
105 (channels == 1 && color_type == PNG_COLOR_TYPE_PALETTE)))) {
106 return -7;
107 goto exit;
108 }
109
110 surface = malloc(sizeof(GGLSurface) + pixelSize);
111 if (surface == NULL) {
112 result = -8;
113 goto exit;
114 }
115 unsigned char* pData = (unsigned char*) (surface + 1);
116 surface->version = sizeof(GGLSurface);
117 surface->width = width;
118 surface->height = height;
119 surface->stride = width; /* Yes, pixels, not bytes */
120 surface->data = pData;
121 surface->format = (channels == 3) ?
122 GGL_PIXEL_FORMAT_RGBX_8888 : GGL_PIXEL_FORMAT_RGBA_8888;
123
124 int alpha = 0;
125 if (color_type == PNG_COLOR_TYPE_PALETTE) {
126 png_set_palette_to_rgb(png_ptr);
127 }
128 if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
129 png_set_tRNS_to_alpha(png_ptr);
130 alpha = 1;
131 }
132
133 int y;
134 if (channels == 3 || (channels == 1 && !alpha)) {
135 for (y = 0; y < height; ++y) {
136 unsigned char* pRow = pData + y * stride;
137 png_read_row(png_ptr, pRow, NULL);
138
139 int x;
140 for(x = width - 1; x >= 0; x--) {
141 int sx = x * 3;
142 int dx = x * 4;
143 unsigned char r = pRow[sx];
144 unsigned char g = pRow[sx + 1];
145 unsigned char b = pRow[sx + 2];
146 unsigned char a = 0xff;
147 pRow[dx ] = r; // r
148 pRow[dx + 1] = g; // g
149 pRow[dx + 2] = b; // b
150 pRow[dx + 3] = a;
151 }
152 }
153 } else {
154 for (y = 0; y < height; ++y) {
155 unsigned char* pRow = pData + y * stride;
156 png_read_row(png_ptr, pRow, NULL);
157 }
158 }
159
160 *pSurface = (gr_surface) surface;
161
162 exit:
163 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
164
165 if (fp != NULL) {
166 fclose(fp);
167 }
168 if (result < 0) {
169 if (surface) {
170 free(surface);
171 }
172 }
173 return result;
174 }
175
res_free_surface(gr_surface surface)176 void res_free_surface(gr_surface surface) {
177 GGLSurface* pSurface = (GGLSurface*) surface;
178 if (pSurface) {
179 free(pSurface);
180 }
181 }
182