summaryrefslogtreecommitdiffstats
path: root/recovery/graphics.c
blob: 7af58bcdda42f2b1ce0c173370ee046ce07f9cc3 (plain)
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
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <stdlib.h>
#include <unistd.h>

#include <fcntl.h>
#include <stdio.h>

#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>

#include <linux/fb.h>
#include <linux/kd.h>

#include <pixelflinger/pixelflinger.h>

#include "roboto_10x18.h"

#include "minui.h"

typedef struct {
    GGLSurface texture;
    unsigned cwidth;
    unsigned cheight;
    unsigned ascent;
} GRFont;

static GRFont *gr_font = 0;
static GGLContext *gr_context = 0;
static GGLSurface gr_font_texture;
static GGLSurface gr_framebuffer[2];
static GGLSurface gr_mem_surface;
static unsigned gr_active_fb = 0;

static int gr_fb_fd = -1;
static int gr_vt_fd = -1;

static struct fb_var_screeninfo vi;

static int get_framebuffer(GGLSurface *fb)
{
    int fd;
    struct fb_fix_screeninfo fi;
    void *bits;

    fd = open("/dev/graphics/fb0", O_RDWR);
    if (fd < 0) {
        perror("cannot open fb0");
        return -1;
    }

    if (ioctl(fd, FBIOGET_FSCREENINFO, &fi) < 0) {
        perror("failed to get fb0 info");
        close(fd);
        return -1;
    }

    if (ioctl(fd, FBIOGET_VSCREENINFO, &vi) < 0) {
        perror("failed to get fb0 info");
        close(fd);
        return -1;
    }

    bits = mmap(0, fi.smem_len, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
    if (bits == MAP_FAILED) {
        perror("failed to mmap framebuffer");
        close(fd);
        return -1;
    }

    fb->version = sizeof(*fb);
    fb->width = vi.xres;
    fb->height = vi.yres;
    fb->stride = vi.xres;
    fb->data = bits;
    fb->format = GGL_PIXEL_FORMAT_RGB_565;
    memset(fb->data, 0, vi.yres * vi.xres * 2);

    fb++;

    fb->version = sizeof(*fb);
    fb->width = vi.xres;
    fb->height = vi.yres;
    fb->stride = vi.xres;
    fb->data = (void*) (((unsigned) bits) + vi.yres * vi.xres * 2);
    fb->format = GGL_PIXEL_FORMAT_RGB_565;
    memset(fb->data, 0, vi.yres * vi.xres * 2);

    return fd;
}

static void get_memory_surface(GGLSurface* ms) {
  ms->version = sizeof(*ms);
  ms->width = vi.xres;
  ms->height = vi.yres;
  ms->stride = vi.xres;
  ms->data = malloc(vi.xres * vi.yres * 2);
  ms->format = GGL_PIXEL_FORMAT_RGB_565;
}

static void set_active_framebuffer(unsigned n)
{
    if (n > 1) return;
    vi.yres_virtual = vi.yres * 2;
    vi.yoffset = n * vi.yres;
    vi.bits_per_pixel = 16;
    if (ioctl(gr_fb_fd, FBIOPUT_VSCREENINFO, &vi) < 0) {
        perror("active fb swap failed");
    }
}

void gr_flip(void)
{
    GGLContext *gl = gr_context;

    /* swap front and back buffers */
    gr_active_fb = (gr_active_fb + 1) & 1;

    /* copy data from the in-memory surface to the buffer we're about
     * to make active. */
    memcpy(gr_framebuffer[gr_active_fb].data, gr_mem_surface.data,
           vi.xres * vi.yres * 2);

    /* inform the display driver */
    set_active_framebuffer(gr_active_fb);
}

void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
{
    GGLContext *gl = gr_context;
    GGLint color[4];
    color[0] = ((r << 8) | r) + 1;
    color[1] = ((g << 8) | g) + 1;
    color[2] = ((b << 8) | b) + 1;
    color[3] = ((a << 8) | a) + 1;
    gl->color4xv(gl, color);
}

int gr_measure(const char *s)
{
    return gr_font->cwidth * strlen(s);
}

void gr_font_size(int *x, int *y)
{
    *x = gr_font->cwidth;
    *y = gr_font->cheight;
}

int gr_text(int x, int y, const char *s)
{
    GGLContext *gl = gr_context;
    GRFont *font = gr_font;
    unsigned off;

    y -= font->ascent;

    gl->bindTexture(gl, &font->texture);
    gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
    gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
    gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
    gl->enable(gl, GGL_TEXTURE_2D);

    while((off = *s++)) {
        off -= 32;
        if (off < 96) {
            gl->texCoord2i(gl, (off * font->cwidth) - x, 0 - y);
            gl->recti(gl, x, y, x + font->cwidth, y + font->cheight);
        }
        x += font->cwidth;
    }

    return x;
}

void gr_fill(int x, int y, int w, int h)
{
    GGLContext *gl = gr_context;
    gl->disable(gl, GGL_TEXTURE_2D);
    gl->recti(gl, x, y, w, h);
}

void gr_blit(gr_surface source, int sx, int sy, int w, int h, int dx, int dy) {
    if (gr_context == NULL) {
        return;
    }
    GGLContext *gl = gr_context;

    gl->bindTexture(gl, (GGLSurface*) source);
    gl->texEnvi(gl, GGL_TEXTURE_ENV, GGL_TEXTURE_ENV_MODE, GGL_REPLACE);
    gl->texGeni(gl, GGL_S, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
    gl->texGeni(gl, GGL_T, GGL_TEXTURE_GEN_MODE, GGL_ONE_TO_ONE);
    gl->enable(gl, GGL_TEXTURE_2D);
    gl->texCoord2i(gl, sx - dx, sy - dy);
    gl->recti(gl, dx, dy, dx + w, dy + h);
}

unsigned int gr_get_width(gr_surface surface) {
    if (surface == NULL) {
        return 0;
    }
    return ((GGLSurface*) surface)->width;
}

unsigned int gr_get_height(gr_surface surface) {
    if (surface == NULL) {
        return 0;
    }
    return ((GGLSurface*) surface)->height;
}

static void gr_init_font(void)
{
    GGLSurface *ftex;
    unsigned char *bits, *rle;
    unsigned char *in, data;

    gr_font = calloc(sizeof(*gr_font), 1);
    ftex = &gr_font->texture;

    bits = malloc(font.width * font.height);

    ftex->version = sizeof(*ftex);
    ftex->width = font.width;
    ftex->height = font.height;
    ftex->stride = font.width;
    ftex->data = (void*) bits;
    ftex->format = GGL_PIXEL_FORMAT_A_8;

    in = font.rundata;
    while((data = *in++)) {
        memset(bits, (data & 0x80) ? 255 : 0, data & 0x7f);
        bits += (data & 0x7f);
    }

    gr_font->cwidth = font.cwidth;
    gr_font->cheight = font.cheight;
    gr_font->ascent = font.cheight - 2;
}

int gr_init(void)
{
    gglInit(&gr_context);
    GGLContext *gl = gr_context;

    gr_init_font();
    gr_vt_fd = open("/dev/tty0", O_RDWR | O_SYNC);
    if (gr_vt_fd < 0) {
        // This is non-fatal; post-Cupcake kernels don't have tty0.
        perror("can't open /dev/tty0");
    } else if (ioctl(gr_vt_fd, KDSETMODE, (void*) KD_GRAPHICS)) {
        // However, if we do open tty0, we expect the ioctl to work.
        perror("failed KDSETMODE to KD_GRAPHICS on tty0");
        gr_exit();
        return -1;
    }

    gr_fb_fd = get_framebuffer(gr_framebuffer);
    if (gr_fb_fd < 0) {
        gr_exit();
        return -1;
    }

    get_memory_surface(&gr_mem_surface);

    fprintf(stderr, "framebuffer: fd %d (%d x %d)\n",
            gr_fb_fd, gr_framebuffer[0].width, gr_framebuffer[0].height);

        /* start with 0 as front (displayed) and 1 as back (drawing) */
    gr_active_fb = 0;
    set_active_framebuffer(0);
    gl->colorBuffer(gl, &gr_mem_surface);

    gl->activeTexture(gl, 0);
    gl->enable(gl, GGL_BLEND);
    gl->blendFunc(gl, GGL_SRC_ALPHA, GGL_ONE_MINUS_SRC_ALPHA);

    return 0;
}

void gr_exit(void)
{
    close(gr_fb_fd);
    gr_fb_fd = -1;

    free(gr_mem_surface.data);

    ioctl(gr_vt_fd, KDSETMODE, (void*) KD_TEXT);
    close(gr_vt_fd);
    gr_vt_fd = -1;
}

int gr_fb_width(void)
{
    return gr_framebuffer[0].width;
}

int gr_fb_height(void)
{
    return gr_framebuffer[0].height;
}

gr_pixel *gr_fb_data(void)
{
    return (unsigned short *) gr_mem_surface.data;
}

void gr_fb_blank(bool blank)
{
    int ret;

    ret = ioctl(gr_fb_fd, FBIOBLANK, blank ? FB_BLANK_POWERDOWN : FB_BLANK_UNBLANK);
    if (ret < 0)
        perror("ioctl(): blank");
}