mirror of
https://github.com/webmproject/libwebp.git
synced 2024-11-20 12:28:26 +01:00
6d0e66c23e
+ add a simple rescaling function: WebPPictureRescale() for encoding + clean-up the memory managment around the alpha plane + fix some includes path by using "../webp/xxx.h" instead of "webp/xxx.h" New flags for 'cwebp': -resize <width> <height> -444 (no effect) -422 (no effect) -400 Change-Id: I25a95f901493f939c2dd789e658493b83bd1abfa
119 lines
3.5 KiB
C
119 lines
3.5 KiB
C
// Copyright 2011 Google Inc.
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//
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// This code is licensed under the same terms as WebM:
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// Software License Agreement: http://www.webmproject.org/license/software/
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// Additional IP Rights Grant: http://www.webmproject.org/license/additional/
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// -----------------------------------------------------------------------------
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//
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// Coding tools configuration
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//
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// Author: Skal (pascal.massimino@gmail.com)
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#include <assert.h>
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#include "../webp/encode.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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//-----------------------------------------------------------------------------
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// WebPConfig
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//-----------------------------------------------------------------------------
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int WebPConfigInitInternal(WebPConfig* const config,
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WebPPreset preset, float quality, int version) {
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if (version != WEBP_ENCODER_ABI_VERSION) {
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return 0; // caller/system version mismatch!
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}
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if (config == NULL) return 0;
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config->quality = quality;
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config->target_size = 0;
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config->target_PSNR = 0.;
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config->method = 4;
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config->sns_strength = 50;
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config->filter_strength = 20; // default: light filtering
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config->filter_sharpness = 0;
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config->filter_type = 0; // default: simple
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config->partitions = 0;
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config->segments = 4;
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config->pass = 1;
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config->show_compressed = 0;
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config->preprocessing = 0;
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config->autofilter = 0;
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config->alpha_compression = 0;
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// TODO(skal): tune.
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switch (preset) {
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case WEBP_PRESET_PICTURE:
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config->sns_strength = 80;
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config->filter_sharpness = 4;
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config->filter_strength = 35;
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break;
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case WEBP_PRESET_PHOTO:
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config->sns_strength = 80;
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config->filter_sharpness = 3;
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config->filter_strength = 30;
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break;
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case WEBP_PRESET_DRAWING:
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config->sns_strength = 25;
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config->filter_sharpness = 6;
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config->filter_strength = 10;
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break;
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case WEBP_PRESET_ICON:
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config->sns_strength = 0;
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config->filter_strength = 0; // disable filtering to retain sharpness
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break;
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case WEBP_PRESET_TEXT:
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config->sns_strength = 0;
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config->filter_strength = 0; // disable filtering to retain sharpness
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config->segments = 2;
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break;
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case WEBP_PRESET_DEFAULT:
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default:
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break;
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}
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return WebPValidateConfig(config);
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}
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int WebPValidateConfig(const WebPConfig* const config) {
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if (config == NULL) return 0;
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if (config->quality < 0 || config->quality > 100)
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return 0;
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if (config->target_size < 0)
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return 0;
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if (config->target_PSNR < 0)
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return 0;
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if (config->method < 0 || config->method > 6)
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return 0;
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if (config->segments < 1 || config->segments > 4)
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return 0;
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if (config->sns_strength < 0 || config->sns_strength > 100)
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return 0;
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if (config->filter_strength < 0 || config->filter_strength > 100)
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return 0;
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if (config->filter_sharpness < 0 || config->filter_sharpness > 7)
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return 0;
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if (config->filter_type < 0 || config->filter_type > 1)
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return 0;
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if (config->autofilter < 0 || config->autofilter > 1)
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return 0;
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if (config->pass < 1 || config->pass > 10)
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return 0;
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if (config->show_compressed < 0 || config->show_compressed > 1)
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return 0;
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if (config->preprocessing < 0 || config->preprocessing > 1)
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return 0;
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if (config->partitions < 0 || config->partitions > 3)
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return 0;
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if (config->alpha_compression < 0)
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return 0;
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return 1;
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}
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//-----------------------------------------------------------------------------
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#if defined(__cplusplus) || defined(c_plusplus)
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} // extern "C"
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#endif
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