107 lines
3.1 KiB
C
107 lines
3.1 KiB
C
/*
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* Copyright (C) 2007 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 <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include <fcntl.h>
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#include "fdevent.h"
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#include "adb.h"
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#include <linux/fb.h>
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#include <sys/ioctl.h>
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#include <sys/mman.h>
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/* TODO:
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** - sync with vsync to avoid tearing
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*/
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/* This version number defines the format of the fbinfo struct.
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It must match versioning in ddms where this data is consumed. */
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#define DDMS_RAWIMAGE_VERSION 1
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struct fbinfo {
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unsigned int version;
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unsigned int bpp;
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unsigned int size;
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unsigned int width;
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unsigned int height;
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unsigned int red_offset;
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unsigned int red_length;
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unsigned int blue_offset;
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unsigned int blue_length;
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unsigned int green_offset;
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unsigned int green_length;
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unsigned int alpha_offset;
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unsigned int alpha_length;
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} __attribute__((packed));
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void framebuffer_service(int fd, void *cookie)
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{
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struct fb_var_screeninfo vinfo;
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int fb, offset;
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char x[256];
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struct fbinfo fbinfo;
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unsigned i, bytespp;
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fb = open("/dev/graphics/fb0", O_RDONLY);
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if(fb < 0) goto done;
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if(ioctl(fb, FBIOGET_VSCREENINFO, &vinfo) < 0) goto done;
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fcntl(fb, F_SETFD, FD_CLOEXEC);
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bytespp = vinfo.bits_per_pixel / 8;
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fbinfo.version = DDMS_RAWIMAGE_VERSION;
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fbinfo.bpp = vinfo.bits_per_pixel;
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fbinfo.size = vinfo.xres * vinfo.yres * bytespp;
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fbinfo.width = vinfo.xres;
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fbinfo.height = vinfo.yres;
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fbinfo.red_offset = vinfo.red.offset;
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fbinfo.red_length = vinfo.red.length;
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fbinfo.green_offset = vinfo.green.offset;
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fbinfo.green_length = vinfo.green.length;
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fbinfo.blue_offset = vinfo.blue.offset;
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fbinfo.blue_length = vinfo.blue.length;
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fbinfo.alpha_offset = vinfo.transp.offset;
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fbinfo.alpha_length = vinfo.transp.length;
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/* HACK: for several of our 3d cores a specific alignment
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* is required so the start of the fb may not be an integer number of lines
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* from the base. As a result we are storing the additional offset in
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* xoffset. This is not the correct usage for xoffset, it should be added
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* to each line, not just once at the beginning */
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offset = vinfo.xoffset * bytespp;
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offset += vinfo.xres * vinfo.yoffset * bytespp;
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if(writex(fd, &fbinfo, sizeof(fbinfo))) goto done;
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lseek(fb, offset, SEEK_SET);
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for(i = 0; i < fbinfo.size; i += 256) {
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if(readx(fb, &x, 256)) goto done;
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if(writex(fd, &x, 256)) goto done;
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}
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if(readx(fb, &x, fbinfo.size % 256)) goto done;
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if(writex(fd, &x, fbinfo.size % 256)) goto done;
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done:
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if(fb >= 0) close(fb);
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close(fd);
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}
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