f65c991d41
This is an alternative to LodePNG take from http://forge.voodooprojects.org/ which is base on picoPNG C++ wrote by Lode Vandevenne. The same author as LodePNG. PicoPNG only support RGBA PNG8 The source code of picopng.c was just adapted to be compliant with C89 and drop the internal ZLIB support. Coding style untouched. Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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 <image_renderer.h>
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#include <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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