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#include <common.h>
#include <errno.h>
#include <malloc.h>
#include <fb.h>
#include <asm/byteorder.h>
#include <init.h>
#include <image_renderer.h>
#include <graphic_utils.h>
#include <linux/zlib.h>
#include "png.h"
z_stream png_stream;
static int initialized;
int png_uncompress_init(void)
{
if (!initialized++) {
png_stream.workspace = malloc(zlib_inflate_workspacesize());
if (!png_stream.workspace) {
initialized = 0;
return -ENOMEM;
}
png_stream.next_in = NULL;
png_stream.avail_in = 0;
zlib_inflateInit(&png_stream);
}
return 0;
}
void png_uncompress_exit(void)
{
if (!--initialized) {
zlib_inflateEnd(&png_stream);
vfree(png_stream.workspace);
}
}
static int png_renderer(struct fb_info *info, struct image *img, void* fb,
int startx, int starty, void* offscreenbuf)
{
int width, height;
void *buf;
int xres, yres;
xres = info->xres;
yres = info->yres;
if (startx < 0) {
startx = (xres - img->width) / 2;
if (startx < 0)
startx = 0;
}
if (starty < 0) {
starty = (yres - img->height) / 2;
if (starty < 0)
starty = 0;
}
width = min(img->width, xres - startx);
height = min(img->height, yres - starty);
buf = offscreenbuf ? offscreenbuf : fb;
rgba_blend(info, img->data, buf, height, width, startx, starty, true);
if (offscreenbuf) {
int fbsize;
fbsize = xres * yres * (info->bits_per_pixel >> 3);
memcpy(fb, offscreenbuf, fbsize);
}
return img->height;
}
static struct image_renderer png = {
.type = filetype_png,
.open = png_open,
.close = png_close,
.renderer = png_renderer,
};
static int png_init(void)
{
return image_renderer_register(&png);
}
fs_initcall(png_init);
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