163 lines
3.5 KiB
C
163 lines
3.5 KiB
C
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <linux/fb.h>
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#include <linux/kd.h>
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#include "log.h"
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#ifdef ANDROID
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#include <cutils/memory.h>
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#else
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void android_memset16(void *_ptr, unsigned short val, unsigned count)
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{
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unsigned short *ptr = _ptr;
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count >>= 1;
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while(count--)
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*ptr++ = val;
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}
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#endif
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struct FB {
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unsigned short *bits;
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unsigned size;
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int fd;
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struct fb_fix_screeninfo fi;
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struct fb_var_screeninfo vi;
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};
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#define fb_width(fb) ((fb)->vi.xres)
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#define fb_height(fb) ((fb)->vi.yres)
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#define fb_size(fb) ((fb)->vi.xres * (fb)->vi.yres * 2)
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static int fb_open(struct FB *fb)
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{
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fb->fd = open("/dev/graphics/fb0", O_RDWR);
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if (fb->fd < 0)
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return -1;
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if (ioctl(fb->fd, FBIOGET_FSCREENINFO, &fb->fi) < 0)
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goto fail;
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if (ioctl(fb->fd, FBIOGET_VSCREENINFO, &fb->vi) < 0)
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goto fail;
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fb->bits = mmap(0, fb_size(fb), PROT_READ | PROT_WRITE,
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MAP_SHARED, fb->fd, 0);
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if (fb->bits == MAP_FAILED)
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goto fail;
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return 0;
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fail:
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close(fb->fd);
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return -1;
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}
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static void fb_close(struct FB *fb)
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{
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munmap(fb->bits, fb_size(fb));
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close(fb->fd);
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}
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/* there's got to be a more portable way to do this ... */
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static void fb_update(struct FB *fb)
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{
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fb->vi.yoffset = 1;
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ioctl(fb->fd, FBIOPUT_VSCREENINFO, &fb->vi);
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fb->vi.yoffset = 0;
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ioctl(fb->fd, FBIOPUT_VSCREENINFO, &fb->vi);
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}
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static int vt_set_mode(int graphics)
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{
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int fd, r;
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fd = open("/dev/tty0", O_RDWR | O_SYNC);
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if (fd < 0)
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return -1;
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r = ioctl(fd, KDSETMODE, (void*) (graphics ? KD_GRAPHICS : KD_TEXT));
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close(fd);
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return r;
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}
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/* 565RLE image format: [count(2 bytes), rle(2 bytes)] */
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int load_565rle_image(char *fn)
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{
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struct FB fb;
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struct stat s;
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unsigned short *data, *bits, *ptr;
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unsigned count, max;
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int fd;
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if (vt_set_mode(1))
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return -1;
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fd = open(fn, O_RDONLY);
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if (fd < 0) {
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ERROR("cannot open '%s'\n", fn);
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goto fail_restore_text;
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}
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if (fstat(fd, &s) < 0) {
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goto fail_close_file;
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}
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data = mmap(0, s.st_size, PROT_READ, MAP_SHARED, fd, 0);
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if (data == MAP_FAILED)
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goto fail_close_file;
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if (fb_open(&fb))
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goto fail_unmap_data;
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max = fb_width(&fb) * fb_height(&fb);
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ptr = data;
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count = s.st_size;
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bits = fb.bits;
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while (count > 3) {
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unsigned n = ptr[0];
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if (n > max)
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break;
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android_memset16(bits, ptr[1], n << 1);
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bits += n;
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max -= n;
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ptr += 2;
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count -= 4;
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}
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munmap(data, s.st_size);
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fb_update(&fb);
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fb_close(&fb);
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close(fd);
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unlink(fn);
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return 0;
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fail_unmap_data:
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munmap(data, s.st_size);
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fail_close_file:
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close(fd);
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fail_restore_text:
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vt_set_mode(0);
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return -1;
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}
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