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/*
* -- http://android-fb2png.googlecode.com/svn/trunk/fb.c --
*
* Copyright 2011, Kyan He <kyan.ql.he@gmail.com>
*
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include "log.h"
#include "fb.h"
#include "img_process.h"
void fb_dump(const struct fb* fb)
{
D("%12s : %d", "bpp", fb->bpp);
D("%12s : %d", "size", fb->size);
D("%12s : %d", "width", fb->width);
D("%12s : %d", "height", fb->height);
D("%12s : %d %d %d %d", "ARGB offset",
fb->alpha_offset, fb->red_offset,
fb->green_offset, fb->blue_offset);
D("%12s : %d %d %d %d", "ARGB length",
fb->alpha_length, fb->red_length,
fb->green_length, fb->blue_length);
}
/**
* Returns the format of fb.
*/
static int fb_get_format(const struct fb *fb)
{
int ao = fb->alpha_offset;
int ro = fb->red_offset;
int go = fb->green_offset;
int bo = fb->blue_offset;
#define FB_FORMAT_UNKNOWN 0
#define FB_FORMAT_RGB565 1
#define FB_FORMAT_ARGB8888 2
#define FB_FORMAT_RGBA8888 3
#define FB_FORMAT_ABGR8888 4
#define FB_FORMAT_BGRA8888 5
/* TODO: use offset */
if (fb->bpp == 16)
return FB_FORMAT_RGB565;
/* TODO: validate */
if (ao == 0 && ro == 8)
return FB_FORMAT_ARGB8888;
if (ao == 0 && bo == 8)
return FB_FORMAT_ABGR8888;
if (ro == 0)
return FB_FORMAT_RGBA8888;
if (bo == 0)
return FB_FORMAT_BGRA8888;
/* fallback */
return FB_FORMAT_UNKNOWN;
}
int fb_save_png(const struct fb *fb, const char *path)
{
char *rgb_matrix;
int ret = -1;
/* Allocate RGB Matrix. */
rgb_matrix = malloc(fb->width * fb->height * 3);
if(!rgb_matrix) {
free(rgb_matrix);
return -1;
}
int fmt = fb_get_format(fb);
D("Framebuffer Pixel Format: %d", fmt);
switch(fmt) {
case FB_FORMAT_RGB565:
/* emulator use rgb565 */
ret = rgb565_to_rgb888(fb->data,
rgb_matrix, fb->width * fb->height);
break;
case FB_FORMAT_ARGB8888:
/* most devices use argb8888 */
ret = argb8888_to_rgb888(fb->data,
rgb_matrix, fb->width * fb->height);
break;
case FB_FORMAT_ABGR8888:
ret = abgr8888_to_rgb888(fb->data,
rgb_matrix, fb->width * fb->height);
break;
case FB_FORMAT_BGRA8888:
ret = bgra8888_to_rgb888(fb->data,
rgb_matrix, fb->width * fb->height);
break;
case FB_FORMAT_RGBA8888:
ret = rgba8888_to_rgb888(fb->data,
rgb_matrix, fb->width * fb->height);
break;
default:
D("Unsupported framebuffer type.");
break;
}
if (ret != 0)
D("Error while processing input image.");
else if (0 != (ret = save_png(path, rgb_matrix, fb->width, fb->height)))
D("Failed to save in PNG format.");
free(rgb_matrix);
return ret;
}
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