86 lines
1.6 KiB
C
86 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 "picopng.h"
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#include "png.h"
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unsigned picopng_zlib_decompress(unsigned char* out, size_t outsize,
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const unsigned char* in, size_t insize)
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{
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int err;
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png_stream.next_in = in;
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png_stream.avail_in = insize;
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png_stream.next_out = out;
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png_stream.avail_out = outsize;
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err = zlib_inflateReset(&png_stream);
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if (err != Z_OK) {
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printk("zlib_inflateReset error %d\n", err);
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zlib_inflateEnd(&png_stream);
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zlib_inflateInit(&png_stream);
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}
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err = zlib_inflate(&png_stream, Z_FINISH);
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if (err != Z_STREAM_END)
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goto err;
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return 0;
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err:
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printk("Error %d while decompressing!\n", err);
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printk("%p(%zd)->%p(%zd)\n", in, insize, out, outsize);
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return -EIO;
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}
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struct image *png_open(char *inbuf, int insize)
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{
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PNG_info_t *png_info;
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int ret;
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struct image *img = calloc(1, sizeof(struct image));
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if (!img)
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return ERR_PTR(-ENOMEM);
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ret = png_uncompress_init();
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if (ret)
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goto err;
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/* rgba */
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png_info = PNG_decode(inbuf, insize);
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if(PNG_error) {
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printf("error %u:\n", PNG_error);
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ret = -EINVAL;
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goto err;
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}
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img->width = png_info->width;
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img->height = png_info->height;
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img->bits_per_pixel = 4 << 3;
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img->data = png_info->image->data;
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pr_debug("png: %d x %d data@0x%p\n", img->width, img->height, img->data);
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png_alloc_free_all();
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return img;
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err:
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png_alloc_free_all();
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free(img);
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return ERR_PTR(ret);
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}
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void png_close(struct image *img)
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{
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free(img->data);
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png_alloc_free_all();
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}
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