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