std/webp: add new package (and vp8 placeholder)

Author: nigeltao

doc/changelog.md

@@ -21,6 +21,8 @@ The LICENSE has changed from a single license (Apache 2) to a dual license
 - Added `std/lzma`.
 - Added `std/netpbm`.
 - Added `std/sha256`.
+- Added `std/vp8`.
+- Added `std/webp`.
 - Added `std/xxhash32`.
 - Added `std/xxhash64`.
 - Added `std/xz`.

doc/std/README.md

@@ -64,7 +64,9 @@ to enable.
 - `PNG:       BASE, ADLER32, CRC32, DEFLATE, ZLIB`
 - `SHA256:    BASE`
 - `TGA:       BASE`
+- `VP8:       BASE`
 - `WBMP:      BASE`
+- `WEBP:      BASE, VP8`
 - `XXHASH32:  BASE`
 - `XXHASH64:  BASE`
 - `XZ:        BASE, CRC32, CRC64, LZMA, SHA256`

doc/std/image-decoders.md

@@ -131,6 +131,7 @@ In Wuffs syntax, the `base.image_decoder` methods are:
 - [std/png](/std/png)
 - [std/tga](/std/tga)
 - [std/wbmp](/std/wbmp)
+- [std/webp](/std/webp)
 
 
 ## Examples

example/convert-to-nia/convert-to-nia.c

@@ -67,7 +67,9 @@ An equivalent program (using the Skia image codecs) is at:
 #define WUFFS_CONFIG__MODULE__NIE
 #define WUFFS_CONFIG__MODULE__PNG
 #define WUFFS_CONFIG__MODULE__TGA
+#define WUFFS_CONFIG__MODULE__VP8
 #define WUFFS_CONFIG__MODULE__WBMP
+#define WUFFS_CONFIG__MODULE__WEBP
 #define WUFFS_CONFIG__MODULE__ZLIB
 
 // Defining the WUFFS_CONFIG__DST_PIXEL_FORMAT__ENABLE_ALLOWLIST (and the
@@ -164,6 +166,7 @@ union {
   wuffs_png__decoder png;
   wuffs_tga__decoder tga;
   wuffs_wbmp__decoder wbmp;
+  wuffs_webp__decoder webp;
 } g_potential_decoders;
 
 wuffs_crc32__ieee_hasher g_digest_hasher;
@@ -413,6 +416,16 @@ initialize_image_decoder() {
           wuffs_wbmp__decoder__upcast_as__wuffs_base__image_decoder(
               &g_potential_decoders.wbmp);
       return NULL;
+
+    case WUFFS_BASE__FOURCC__WEBP:
+      status = wuffs_webp__decoder__initialize(
+          &g_potential_decoders.webp, sizeof g_potential_decoders.webp,
+          WUFFS_VERSION, WUFFS_INITIALIZE__DEFAULT_OPTIONS);
+      TRY(wuffs_base__status__message(&status));
+      g_image_decoder =
+          wuffs_webp__decoder__upcast_as__wuffs_base__image_decoder(
+              &g_potential_decoders.webp);
+      return NULL;
   }
   return "main: unsupported file format";
 }

example/imageviewer/imageviewer.cc

@@ -80,7 +80,9 @@ The Escape key quits.
 #define WUFFS_CONFIG__MODULE__NIE
 #define WUFFS_CONFIG__MODULE__PNG
 #define WUFFS_CONFIG__MODULE__TGA
+#define WUFFS_CONFIG__MODULE__VP8
 #define WUFFS_CONFIG__MODULE__WBMP
+#define WUFFS_CONFIG__MODULE__WEBP
 #define WUFFS_CONFIG__MODULE__ZLIB
 
 // Defining the WUFFS_CONFIG__DST_PIXEL_FORMAT__ENABLE_ALLOWLIST (and the

example/sdl-imageviewer/sdl-imageviewer.cc

@@ -78,7 +78,9 @@ isn't otherwise doing anything.
 #define WUFFS_CONFIG__MODULE__NIE
 #define WUFFS_CONFIG__MODULE__PNG
 #define WUFFS_CONFIG__MODULE__TGA
+#define WUFFS_CONFIG__MODULE__VP8
 #define WUFFS_CONFIG__MODULE__WBMP
+#define WUFFS_CONFIG__MODULE__WEBP
 #define WUFFS_CONFIG__MODULE__ZLIB
 
 // Defining the WUFFS_CONFIG__DST_PIXEL_FORMAT__ENABLE_ALLOWLIST (and the

internal/cgen/auxiliary/image.cc

@@ -100,6 +100,11 @@ DecodeImageCallbacks::SelectDecoder(uint32_t fourcc,
     case WUFFS_BASE__FOURCC__WBMP:
       return wuffs_wbmp__decoder::alloc_as__wuffs_base__image_decoder();
 #endif
+
+#if !defined(WUFFS_CONFIG__MODULES) || defined(WUFFS_CONFIG__MODULE__WEBP)
+    case WUFFS_BASE__FOURCC__WEBP:
+      return wuffs_webp__decoder::alloc_as__wuffs_base__image_decoder();
+#endif
   }
 
   return wuffs_base__image_decoder::unique_ptr(nullptr);

internal/cgen/auxiliary/image.hh

@@ -91,6 +91,7 @@ class DecodeImageCallbacks {
   //  - WUFFS_BASE__FOURCC__PNG
   //  - WUFFS_BASE__FOURCC__TGA
   //  - WUFFS_BASE__FOURCC__WBMP
+  //  - WUFFS_BASE__FOURCC__WEBP
   virtual wuffs_base__image_decoder::unique_ptr  //
   SelectDecoder(uint32_t fourcc,
                 wuffs_base__slice_u8 prefix_data,