feat(png): store filter method in png_ctx

2 files changed, 2 insertions, 0 deletions

diff --git a/include/tinyff/image/png.h b/include/tinyff/image/png.h
index fb064db..91ec477 100644
--- a/include/tinyff/image/png.h
+++ b/include/tinyff/image/png.h
@@ -36,6 +36,7 @@ typedef struct {
     // Color information
     uint8_t bit_depth;
     uint8_t color_type;
+    uint8_t filter_method;
 
     // Interlace method
     uint8_t interlace_method;
diff --git a/src/format/image/png.c b/src/format/image/png.c
index dfd3230..51cc979 100644
--- a/src/format/image/png.c
+++ b/src/format/image/png.c
@@ -210,6 +210,7 @@ ff_result ff_png_header_handler(ff_ctx* ctx, uint8_t *buf, size_t len, ff_png_ct
     png_ctx->height = h;
     png_ctx->bit_depth = buf[8];
     png_ctx->color_type = buf[9];
+    png_ctx->filter_method = buf[11];
     png_ctx->interlace_method = buf[12];
 
     ff_dprintf(ctx, "png: IHDR stored in context\n");