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-rw-r--r--third_party/libwebp/enc/config.c115
1 files changed, 115 insertions, 0 deletions
diff --git a/third_party/libwebp/enc/config.c b/third_party/libwebp/enc/config.c
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+++ b/third_party/libwebp/enc/config.c
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+// Copyright 2011 Google Inc.
+//
+// This code is licensed under the same terms as WebM:
+// Software License Agreement: http://www.webmproject.org/license/software/
+// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
+// -----------------------------------------------------------------------------
+//
+// Coding tools configuration
+//
+// Author: Skal (pascal.massimino@gmail.com)
+
+#include <assert.h>
+#include "../webp/encode.h"
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+//-----------------------------------------------------------------------------
+// WebPConfig
+//-----------------------------------------------------------------------------
+
+int WebPConfigInitInternal(WebPConfig* const config,
+ WebPPreset preset, float quality, int version) {
+ if (version != WEBP_ENCODER_ABI_VERSION) {
+ return 0; // caller/system version mismatch!
+ }
+ if (config == NULL) return 0;
+
+ config->quality = quality;
+ config->target_size = 0;
+ config->target_PSNR = 0.;
+ config->method = 4;
+ config->sns_strength = 50;
+ config->filter_strength = 20; // default: light filtering
+ config->filter_sharpness = 0;
+ config->filter_type = 0; // default: simple
+ config->partitions = 0;
+ config->segments = 4;
+ config->pass = 1;
+ config->show_compressed = 0;
+ config->preprocessing = 0;
+ config->autofilter = 0;
+
+ // TODO(skal): tune.
+ switch (preset) {
+ case WEBP_PRESET_PICTURE:
+ config->sns_strength = 80;
+ config->filter_sharpness = 4;
+ config->filter_strength = 35;
+ break;
+ case WEBP_PRESET_PHOTO:
+ config->sns_strength = 80;
+ config->filter_sharpness = 3;
+ config->filter_strength = 30;
+ break;
+ case WEBP_PRESET_DRAWING:
+ config->sns_strength = 25;
+ config->filter_sharpness = 6;
+ config->filter_strength = 10;
+ break;
+ case WEBP_PRESET_ICON:
+ config->sns_strength = 0;
+ config->filter_strength = 0; // disable filtering to retain sharpness
+ break;
+ case WEBP_PRESET_TEXT:
+ config->sns_strength = 0;
+ config->filter_strength = 0; // disable filtering to retain sharpness
+ config->segments = 2;
+ break;
+ case WEBP_PRESET_DEFAULT:
+ default:
+ break;
+ }
+ return WebPValidateConfig(config);
+}
+
+int WebPValidateConfig(const WebPConfig* const config) {
+ if (config == NULL) return 0;
+ if (config->quality < 0 || config->quality > 100)
+ return 0;
+ if (config->target_size < 0)
+ return 0;
+ if (config->target_PSNR < 0)
+ return 0;
+ if (config->method < 0 || config->method > 6)
+ return 0;
+ if (config->segments < 1 || config->segments > 4)
+ return 0;
+ if (config->sns_strength < 0 || config->sns_strength > 100)
+ return 0;
+ if (config->filter_strength < 0 || config->filter_strength > 100)
+ return 0;
+ if (config->filter_sharpness < 0 || config->filter_sharpness > 7)
+ return 0;
+ if (config->filter_type < 0 || config->filter_type > 1)
+ return 0;
+ if (config->autofilter < 0 || config->autofilter > 1)
+ return 0;
+ if (config->pass < 1 || config->pass > 10)
+ return 0;
+ if (config->show_compressed < 0 || config->show_compressed > 1)
+ return 0;
+ if (config->preprocessing < 0 || config->preprocessing > 1)
+ return 0;
+ if (config->partitions < 0 || config->partitions > 3)
+ return 0;
+ return 1;
+}
+
+//-----------------------------------------------------------------------------
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} // extern "C"
+#endif