wip! palette chunk writingstaging/write_palette_chunk

2 files changed, 10 insertions, 3 deletions

diff --git a/include/tinyff/image/png.h b/include/tinyff/image/png.h
index 91ec477..5488d37 100644
--- a/include/tinyff/image/png.h
+++ b/include/tinyff/image/png.h
@@ -65,9 +65,6 @@ typedef struct {
 } ff_png_chunk_handler;
 
 // Handler declarations
-// Massive W.I.P
-
-// Required by definition
 ff_result ff_png_header_handler(ff_ctx* ctx, uint8_t *buf, size_t len, ff_png_ctx* png_ctx); // IHDR
 ff_result ff_png_palette_handler(ff_ctx* ctx, uint8_t *buf, size_t len, ff_png_ctx* png_ctx); // PLTE
 ff_result ff_png_data_handler(ff_ctx* ctx, uint8_t *buf, size_t len, ff_png_ctx* png_ctx); // IDAT
@@ -83,6 +80,8 @@ extern const ff_png_chunk_handler ff_png_chunk_handlers[];
 // Encoding helpers
 ff_result ff_write_chunk(ff_stream *stream, const char *type, uint8_t *buf, size_t len);
 
+// Ancillary chunks encoding helpers
+ff_result ff_write_plte_chunk(ff_ctx *ctx, ff_stream *stream, ff_png_ctx *png_ctx);
 
 ff_result ff_png_isvalid(ff_ctx* ctx, ff_stream *stream);
 ff_result ff_open_png(ff_ctx* ctx, ff_stream *stream, ff_png_ctx **out_ctx, ff_flag require_valid);
diff --git a/src/format/image/png.c b/src/format/image/png.c
index 535c539..94454d6 100644
--- a/src/format/image/png.c
+++ b/src/format/image/png.c
@@ -528,6 +528,14 @@ ff_result ff_encode_png(ff_ctx *ctx, ff_png_ctx *png_ctx, ff_stream *stream)
     return FF_RESULT_WARN_NO_IMPL;
 }
 
+ff_result ff_write_plte_chunk(ff_ctx *ctx, ff_stream *stream, ff_png_ctx *png_ctx)
+{
+    uint8_t* pltebuf = ctx->allocator.ff_alloc(png_ctx->palette_size * 3)
+    for (uint8_t entry = 0; entry < png_ctx->palette_size; entry += 4) {
+        
+    }  
+}
+
 ff_result ff_png_normalize(ff_ctx *ctx, ff_png_ctx *png_ctx, ff_image_ctx **out_data, ff_flag consume)
 {   
     if (png_ctx->bit_depth != 8) return FF_RESULT_WARN_NO_IMPL;