don't forward declare enums

doing so is not part of ISO C; removes some pedantic warnings

Change-Id: I739ad8c5cacc133e2546e9f45c0db9d92fb93d7e
(cherry picked from commit 96e948d7b034d916e959b68e7151405f8a309eaa)

5 files changed, 47 insertions, 47 deletions

diff --git a/src/webp/decode.h b/src/webp/decode.h
index f8a852ca..fc2a83ab 100644
--- a/src/webp/decode.h
+++ b/src/webp/decode.h
@@ -20,13 +20,13 @@ extern "C" {
 
 #define WEBP_DECODER_ABI_VERSION 0x0201    // MAJOR(8b) + MINOR(8b)
 
+// Note: forward declaring enumerations is not allowed in (strict) C and C++,
+// the types are left here for reference.
+// typedef enum VP8StatusCode VP8StatusCode;
+// typedef enum WEBP_CSP_MODE WEBP_CSP_MODE;
 typedef struct WebPRGBABuffer WebPRGBABuffer;
 typedef struct WebPYUVABuffer WebPYUVABuffer;
 typedef struct WebPDecBuffer WebPDecBuffer;
-#if !(defined(__cplusplus) || defined(c_plusplus))
-typedef enum VP8StatusCode VP8StatusCode;
-typedef enum WEBP_CSP_MODE WEBP_CSP_MODE;
-#endif
 typedef struct WebPIDecoder WebPIDecoder;
 typedef struct WebPBitstreamFeatures WebPBitstreamFeatures;
 typedef struct WebPDecoderOptions WebPDecoderOptions;
@@ -138,7 +138,7 @@ WEBP_EXTERN(uint8_t*) WebPDecodeYUVInto(
 // RGBA-4444: [b3 b2 b1 b0 a3 a2 a1 a0], [r3 r2 r1 r0 g3 g2 g1 g0], ...
 // RGB-565: [g2 g1 g0 b4 b3 b2 b1 b0], [r4 r3 r2 r1 r0 g5 g4 g3], ...
 
-enum WEBP_CSP_MODE {
+typedef enum WEBP_CSP_MODE {
   MODE_RGB = 0, MODE_RGBA = 1,
   MODE_BGR = 2, MODE_BGRA = 3,
   MODE_ARGB = 4, MODE_RGBA_4444 = 5,
@@ -151,7 +151,7 @@ enum WEBP_CSP_MODE {
   // YUV modes must come after RGB ones.
   MODE_YUV = 11, MODE_YUVA = 12,  // yuv 4:2:0
   MODE_LAST = 13
-};
+} WEBP_CSP_MODE;
 
 // Some useful macros:
 static WEBP_INLINE int WebPIsPremultipliedMode(WEBP_CSP_MODE mode) {
@@ -220,7 +220,7 @@ WEBP_EXTERN(void) WebPFreeDecBuffer(WebPDecBuffer* buffer);
 //------------------------------------------------------------------------------
 // Enumeration of the status codes
 
-enum VP8StatusCode {
+typedef enum VP8StatusCode {
   VP8_STATUS_OK = 0,
   VP8_STATUS_OUT_OF_MEMORY,
   VP8_STATUS_INVALID_PARAM,
@@ -229,7 +229,7 @@ enum VP8StatusCode {
   VP8_STATUS_SUSPENDED,
   VP8_STATUS_USER_ABORT,
   VP8_STATUS_NOT_ENOUGH_DATA
-};
+} VP8StatusCode;
 
 //------------------------------------------------------------------------------
 // Incremental decoding
diff --git a/src/webp/demux.h b/src/webp/demux.h
index cfb4fdfe..2006b94f 100644
--- a/src/webp/demux.h
+++ b/src/webp/demux.h
@@ -53,11 +53,11 @@ extern "C" {
 
 #define WEBP_DEMUX_ABI_VERSION 0x0100    // MAJOR(8b) + MINOR(8b)
 
+// Note: forward declaring enumerations is not allowed in (strict) C and C++,
+// the types are left here for reference.
+// typedef enum WebPDemuxState WebPDemuxState;
+// typedef enum WebPFormatFeature WebPFormatFeature;
 typedef struct WebPDemuxer WebPDemuxer;
-#if !(defined(__cplusplus) || defined(c_plusplus))
-typedef enum WebPDemuxState WebPDemuxState;
-typedef enum WebPFormatFeature WebPFormatFeature;
-#endif
 typedef struct WebPIterator WebPIterator;
 typedef struct WebPChunkIterator WebPChunkIterator;
 
@@ -70,11 +70,11 @@ WEBP_EXTERN(int) WebPGetDemuxVersion(void);
 //------------------------------------------------------------------------------
 // Life of a Demux object
 
-enum WebPDemuxState {
+typedef enum WebPDemuxState {
   WEBP_DEMUX_PARSING_HEADER,  // Not enough data to parse full header.
   WEBP_DEMUX_PARSED_HEADER,   // Header parsing complete, data may be available.
   WEBP_DEMUX_DONE             // Entire file has been parsed.
-};
+} WebPDemuxState;
 
 // Internal, version-checked, entry point
 WEBP_EXTERN(WebPDemuxer*) WebPDemuxInternal(
@@ -100,7 +100,7 @@ WEBP_EXTERN(void) WebPDemuxDelete(WebPDemuxer* dmux);
 //------------------------------------------------------------------------------
 // Data/information extraction.
 
-enum WebPFormatFeature {
+typedef enum WebPFormatFeature {
   WEBP_FF_FORMAT_FLAGS,  // Extended format flags present in the 'VP8X' chunk.
   WEBP_FF_CANVAS_WIDTH,
   WEBP_FF_CANVAS_HEIGHT,
@@ -110,7 +110,7 @@ enum WebPFormatFeature {
                          // In case of a partial demux, this is the number of
                          // frames seen so far, with the last frame possibly
                          // being partial.
-};
+} WebPFormatFeature;
 
 // Get the 'feature' value from the 'dmux'.
 // NOTE: values are only valid if WebPDemux() was used or WebPDemuxPartial()
diff --git a/src/webp/encode.h b/src/webp/encode.h
index ad20fa1d..d635fcf0 100644
--- a/src/webp/encode.h
+++ b/src/webp/encode.h
@@ -20,12 +20,12 @@ extern "C" {
 
 #define WEBP_ENCODER_ABI_VERSION 0x0201    // MAJOR(8b) + MINOR(8b)
 
-#if !(defined(__cplusplus) || defined(c_plusplus))
-typedef enum WebPImageHint WebPImageHint;
-typedef enum WebPEncCSP WebPEncCSP;
-typedef enum WebPPreset WebPPreset;
-typedef enum WebPEncodingError WebPEncodingError;
-#endif
+// Note: forward declaring enumerations is not allowed in (strict) C and C++,
+// the types are left here for reference.
+// typedef enum WebPImageHint WebPImageHint;
+// typedef enum WebPEncCSP WebPEncCSP;
+// typedef enum WebPPreset WebPPreset;
+// typedef enum WebPEncodingError WebPEncodingError;
 typedef struct WebPConfig WebPConfig;
 typedef struct WebPPicture WebPPicture;   // main structure for I/O
 typedef struct WebPAuxStats WebPAuxStats;
@@ -77,13 +77,13 @@ WEBP_EXTERN(size_t) WebPEncodeLosslessBGRA(const uint8_t* bgra,
 // Coding parameters
 
 // Image characteristics hint for the underlying encoder.
-enum WebPImageHint {
+typedef enum WebPImageHint {
   WEBP_HINT_DEFAULT = 0,  // default preset.
   WEBP_HINT_PICTURE,      // digital picture, like portrait, inner shot
   WEBP_HINT_PHOTO,        // outdoor photograph, with natural lighting
   WEBP_HINT_GRAPH,        // Discrete tone image (graph, map-tile etc).
   WEBP_HINT_LAST
-};
+} WebPImageHint;
 
 // Compression parameters.
 struct WebPConfig {
@@ -133,14 +133,14 @@ struct WebPConfig {
 
 // Enumerate some predefined settings for WebPConfig, depending on the type
 // of source picture. These presets are used when calling WebPConfigPreset().
-enum WebPPreset {
+typedef enum WebPPreset {
   WEBP_PRESET_DEFAULT = 0,  // default preset.
   WEBP_PRESET_PICTURE,      // digital picture, like portrait, inner shot
   WEBP_PRESET_PHOTO,        // outdoor photograph, with natural lighting
   WEBP_PRESET_DRAWING,      // hand or line drawing, with high-contrast details
   WEBP_PRESET_ICON,         // small-sized colorful images
   WEBP_PRESET_TEXT          // text-like
-};
+} WebPPreset;
 
 // Internal, version-checked, entry point
 WEBP_EXTERN(int) WebPConfigInitInternal(WebPConfig*, WebPPreset, float, int);
@@ -230,7 +230,7 @@ WEBP_EXTERN(int) WebPMemoryWrite(const uint8_t* data, size_t data_size,
 typedef int (*WebPProgressHook)(int percent, const WebPPicture* picture);
 
 // Color spaces.
-enum WebPEncCSP {
+typedef enum WebPEncCSP {
   // chroma sampling
   WEBP_YUV420 = 0,   // 4:2:0
   WEBP_YUV422 = 1,   // 4:2:2
@@ -243,10 +243,10 @@ enum WebPEncCSP {
   WEBP_YUV444A = 6,
   WEBP_YUV400A = 7,   // grayscale + alpha
   WEBP_CSP_ALPHA_BIT = 4   // bit that is set if alpha is present
-};
+} WebPEncCSP;
 
 // Encoding error conditions.
-enum WebPEncodingError {
+typedef enum WebPEncodingError {
   VP8_ENC_OK = 0,
   VP8_ENC_ERROR_OUT_OF_MEMORY,            // memory error allocating objects
   VP8_ENC_ERROR_BITSTREAM_OUT_OF_MEMORY,  // memory error while flushing bits
@@ -259,7 +259,7 @@ enum WebPEncodingError {
   VP8_ENC_ERROR_FILE_TOO_BIG,             // file is bigger than 4G
   VP8_ENC_ERROR_USER_ABORT,               // abort request by user
   VP8_ENC_ERROR_LAST                      // list terminator. always last.
-};
+} WebPEncodingError;
 
 // maximum width/height allowed (inclusive), in pixels
 #define WEBP_MAX_DIMENSION 16383
diff --git a/src/webp/mux.h b/src/webp/mux.h
index 85a89227..f869a2dc 100644
--- a/src/webp/mux.h
+++ b/src/webp/mux.h
@@ -53,26 +53,26 @@ extern "C" {
 
 #define WEBP_MUX_ABI_VERSION 0x0100        // MAJOR(8b) + MINOR(8b)
 
+// Note: forward declaring enumerations is not allowed in (strict) C and C++,
+// the types are left here for reference.
+// typedef enum WebPMuxError WebPMuxError;
+// typedef enum WebPChunkId WebPChunkId;
 typedef struct WebPMux WebPMux;   // main opaque object.
-#if !(defined(__cplusplus) || defined(c_plusplus))
-typedef enum WebPMuxError WebPMuxError;
-typedef enum WebPChunkId WebPChunkId;
-#endif
 typedef struct WebPMuxFrameInfo WebPMuxFrameInfo;
 typedef struct WebPMuxAnimParams WebPMuxAnimParams;
 
 // Error codes
-enum WebPMuxError {
+typedef enum WebPMuxError {
   WEBP_MUX_OK                 =  1,
   WEBP_MUX_NOT_FOUND          =  0,
   WEBP_MUX_INVALID_ARGUMENT   = -1,
   WEBP_MUX_BAD_DATA           = -2,
   WEBP_MUX_MEMORY_ERROR       = -3,
   WEBP_MUX_NOT_ENOUGH_DATA    = -4
-};
+} WebPMuxError;
 
 // IDs for different types of chunks.
-enum WebPChunkId {
+typedef enum WebPChunkId {
   WEBP_CHUNK_VP8X,     // VP8X
   WEBP_CHUNK_ICCP,     // ICCP
   WEBP_CHUNK_ANIM,     // ANIM
@@ -84,7 +84,7 @@ enum WebPChunkId {
   WEBP_CHUNK_XMP,      // XMP
   WEBP_CHUNK_UNKNOWN,  // Other chunks.
   WEBP_CHUNK_NIL
-};
+} WebPChunkId;
 
 //------------------------------------------------------------------------------
 
diff --git a/src/webp/mux_types.h b/src/webp/mux_types.h
index 4006a540..7bad0004 100644
--- a/src/webp/mux_types.h
+++ b/src/webp/mux_types.h
@@ -20,31 +20,31 @@
 extern "C" {
 #endif
 
-#if !(defined(__cplusplus) || defined(c_plusplus))
-typedef enum WebPFeatureFlags WebPFeatureFlags;
-typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
-#endif
+// Note: forward declaring enumerations is not allowed in (strict) C and C++,
+// the types are left here for reference.
+// typedef enum WebPFeatureFlags WebPFeatureFlags;
+// typedef enum WebPMuxAnimDispose WebPMuxAnimDispose;
+typedef struct WebPData WebPData;
 
 // VP8X Feature Flags.
-enum WebPFeatureFlags {
+typedef enum WebPFeatureFlags {
   FRAGMENTS_FLAG  = 0x00000001,
   ANIMATION_FLAG  = 0x00000002,
   XMP_FLAG        = 0x00000004,
   EXIF_FLAG       = 0x00000008,
   ALPHA_FLAG      = 0x00000010,
   ICCP_FLAG       = 0x00000020
-};
+} WebPFeatureFlags;
 
 // Dispose method (animation only). Indicates how the area used by the current
 // frame is to be treated before rendering the next frame on the canvas.
-enum WebPMuxAnimDispose {
+typedef enum WebPMuxAnimDispose {
   WEBP_MUX_DISPOSE_NONE,       // Do not dispose.
   WEBP_MUX_DISPOSE_BACKGROUND  // Dispose to background color.
-};
+} WebPMuxAnimDispose;
 
 // Data type used to describe 'raw' data, e.g., chunk data
 // (ICC profile, metadata) and WebP compressed image data.
-typedef struct WebPData WebPData;
 struct WebPData {
   const uint8_t* bytes;
   size_t size;