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-rw-r--r--lib/png_lode.c90
1 files changed, 90 insertions, 0 deletions
diff --git a/lib/png_lode.c b/lib/png_lode.c
new file mode 100644
index 0000000000..4b57f6ad20
--- /dev/null
+++ b/lib/png_lode.c
@@ -0,0 +1,90 @@
+#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 "lodepng.h"
+#include "png.h"
+
+unsigned lodepng_custom_zlib_decompress(unsigned char** out, size_t* outsize,
+ const unsigned char* in, size_t insize,
+ const LodePNGDecompressSettings* settings)
+{
+ int err;
+
+ png_stream.next_in = in;
+ png_stream.avail_in = insize;
+
+ png_stream.next_out = *out;
+ png_stream.avail_out = *outsize;
+
+ err = zlib_inflateReset(&png_stream);
+ if (err != Z_OK) {
+ printk("zlib_inflateReset error %d\n", err);
+ zlib_inflateEnd(&png_stream);
+ zlib_inflateInit(&png_stream);
+ }
+
+ err = zlib_inflate(&png_stream, Z_FINISH);
+ if (err != Z_STREAM_END)
+ goto err;
+ return 0;
+
+err:
+ printk("Error %d while decompressing!\n", err);
+ printk("%p(%zd)->%p(%zd)\n", in, insize, *out, *outsize);
+ return -EIO;
+}
+
+struct image *png_open(char *inbuf, int insize)
+{
+ LodePNGState state;
+ int ret;
+ unsigned error;
+ struct image *img = calloc(1, sizeof(struct image));
+ unsigned char *png;
+
+ if (!img)
+ return ERR_PTR(-ENOMEM);
+
+ ret = png_uncompress_init();
+ if (ret)
+ goto err;
+
+ lodepng_state_init(&state);
+
+ state.info_raw.colortype = LCT_RGBA;
+ state.info_raw.bitdepth = 8;
+
+ error = lodepng_decode(&png, &img->width, &img->height, &state, inbuf, insize);
+
+ if(error) {
+ printf("error %u: %s\n", error, lodepng_error_text(error));
+ ret = -EINVAL;
+ goto err;
+ }
+
+ img->bits_per_pixel = 4 << 3;
+ img->data = png;
+
+ pr_debug("png: %d x %d data@0x%p\n", img->width, img->height, img->data);
+
+ lodepng_state_cleanup(&state);
+
+ return img;
+err:
+ free(png);
+ free(img);
+ return ERR_PTR(ret);
+}
+
+void png_close(struct image *img)
+{
+ free(img->data);
+ png_uncompress_exit();
+}