Merge changes If4debc15,I437a5d5f into 0.4.1

* changes:
  restore encode API compatibility
  restore decode API compatibility

examples/cwebp.c

@@ -573,8 +573,10 @@ static void HelpLong(void) {
   printf("                            default, photo, picture,\n");
   printf("                            drawing, icon, text\n");
   printf("     -preset must come first, as it overwrites other parameters\n");
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
   printf("  -z <int> ............... activates lossless preset with given\n"
          "                           level in [0:fast, ..., 9:slowest]\n");
+#endif
   printf("\n");
   printf("  -m <int> ............... compression method (0=fast, 6=slowest)\n");
   printf("  -segments <int> ........ number of segments to use (1..4)\n");
@@ -676,8 +678,10 @@ int main(int argc, const char *argv[]) {
   uint32_t background_color = 0xffffffu;
   int crop = 0, crop_x = 0, crop_y = 0, crop_w = 0, crop_h = 0;
   int resize_w = 0, resize_h = 0;
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
   int lossless_preset = 6;
   int use_lossless_preset = -1;  // -1=unset, 0=don't use, 1=use it
+#endif
   int show_progress = 0;
   int keep_metadata = 0;
   int metadata_written = 0;
@@ -732,13 +736,17 @@ int main(int argc, const char *argv[]) {
       picture.height = strtol(argv[++c], NULL, 0);
     } else if (!strcmp(argv[c], "-m") && c < argc - 1) {
       config.method = strtol(argv[++c], NULL, 0);
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
       use_lossless_preset = 0;   // disable -z option
+#endif
     } else if (!strcmp(argv[c], "-q") && c < argc - 1) {
       config.quality = (float)strtod(argv[++c], NULL);
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
       use_lossless_preset = 0;   // disable -z option
     } else if (!strcmp(argv[c], "-z") && c < argc - 1) {
       lossless_preset = strtol(argv[++c], NULL, 0);
       if (use_lossless_preset != 0) use_lossless_preset = 1;
+#endif
     } else if (!strcmp(argv[c], "-alpha_q") && c < argc - 1) {
       config.alpha_quality = strtol(argv[++c], NULL, 0);
     } else if (!strcmp(argv[c], "-alpha_method") && c < argc - 1) {
@@ -919,12 +927,14 @@ int main(int argc, const char *argv[]) {
     goto Error;
   }
 
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
   if (use_lossless_preset == 1) {
     if (!WebPConfigLosslessPreset(&config, lossless_preset)) {
       fprintf(stderr, "Invalid lossless preset (-z %d)\n", lossless_preset);
       goto Error;
     }
   }
+#endif
 
   // Check for unsupported command line options for lossless mode and log
   // warning for such options.
@@ -1116,7 +1126,11 @@ int main(int argc, const char *argv[]) {
   return_value = 0;
 
  Error:
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
   WebPMemoryWriterClear(&memory_writer);
+#else
+  free(memory_writer.mem);
+#endif
   free(picture.extra_info);
   MetadataFree(&metadata);
   WebPPictureFree(&picture);

examples/dwebp.c

@@ -557,11 +557,15 @@ static void Help(void) {
          "  -nofilter .... disable in-loop filtering\n"
          "  -nodither .... disable dithering\n"
          "  -dither <d> .. dithering strength (in 0..100)\n"
+#if WEBP_DECODER_ABI_VERSION > 0x0203
          "  -alpha_dither  use alpha-plane dithering if needed\n"
+#endif
          "  -mt .......... use multi-threading\n"
          "  -crop <x> <y> <w> <h> ... crop output with the given rectangle\n"
          "  -scale <w> <h> .......... scale the output (*after* any cropping)\n"
+#if WEBP_DECODER_ABI_VERSION > 0x0203
          "  -flip ........ flip the output vertically\n"
+#endif
          "  -alpha ....... only save the alpha plane\n"
          "  -incremental . use incremental decoding (useful for tests)\n"
          "  -h     ....... this help message\n"
@@ -624,8 +628,10 @@ int main(int argc, const char *argv[]) {
       format = YUV;
     } else if (!strcmp(argv[c], "-mt")) {
       config.options.use_threads = 1;
+#if WEBP_DECODER_ABI_VERSION > 0x0203
     } else if (!strcmp(argv[c], "-alpha_dither")) {
       config.options.alpha_dithering_strength = 100;
+#endif
     } else if (!strcmp(argv[c], "-nodither")) {
       config.options.dithering_strength = 0;
     } else if (!strcmp(argv[c], "-dither") && c < argc - 1) {
@@ -640,8 +646,10 @@ int main(int argc, const char *argv[]) {
       config.options.use_scaling = 1;
       config.options.scaled_width  = strtol(argv[++c], NULL, 0);
       config.options.scaled_height = strtol(argv[++c], NULL, 0);
+#if WEBP_DECODER_ABI_VERSION > 0x0203
     } else if (!strcmp(argv[c], "-flip")) {
       config.options.flip = 1;
+#endif
     } else if (!strcmp(argv[c], "-v")) {
       verbose = 1;
 #ifndef WEBP_DLL

examples/gif2webp_util.c

@@ -475,10 +475,20 @@ static WebPEncodingError SetFrame(const WebPConfig* const config,
     // TODO(later): Perhaps a rough SSIM/PSNR produced by the encoder should
     // also be a criteria, in addition to sizes.
     if (mem1.size <= mem2.size) {
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
       WebPMemoryWriterClear(&mem2);
+#else
+      free(mem2.mem);
+      memset(&mem2, 0, sizeof(mem2));
+#endif
       GetEncodedData(&mem1, encoded_data);
     } else {
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
       WebPMemoryWriterClear(&mem1);
+#else
+      free(mem1.mem);
+      memset(&mem1, 0, sizeof(mem1));
+#endif
       GetEncodedData(&mem2, encoded_data);
     }
   } else {
@@ -487,8 +497,13 @@ static WebPEncodingError SetFrame(const WebPConfig* const config,
   return error_code;
 
  Err:
+#if WEBP_ENCODER_ABI_VERSION > 0x0202
   WebPMemoryWriterClear(&mem1);
   WebPMemoryWriterClear(&mem2);
+#else
+  free(mem1.mem);
+  free(mem2.mem);
+#endif
   return error_code;
 }
 

examples/vwebp.c

@@ -400,7 +400,9 @@ int main(int argc, char *argv[]) {
     return -1;
   }
   config->options.dithering_strength = 50;
+#if WEBP_DECODER_ABI_VERSION > 0x0203
   config->options.alpha_dithering_strength = 100;
+#endif
   kParams.use_color_profile = 1;
 
   for (c = 1; c < argc; ++c) {
@@ -413,8 +415,10 @@ int main(int argc, char *argv[]) {
       config->options.no_fancy_upsampling = 1;
     } else if (!strcmp(argv[c], "-nofilter")) {
       config->options.bypass_filtering = 1;
+#if WEBP_DECODER_ABI_VERSION > 0x0203
     } else if (!strcmp(argv[c], "-noalphadither")) {
       config->options.alpha_dithering_strength = 0;
+#endif
     } else if (!strcmp(argv[c], "-dither") && c + 1 < argc) {
       config->options.dithering_strength = strtol(argv[++c], NULL, 0);
     } else if (!strcmp(argv[c], "-info")) {