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4e38577b30
Adds a Lanczos-derived scaling method, which is rather slow, but very high quality. Adds a few properties that can be used to tune various scaling properties: sharpness, sharpen, envelope, dither. Not currently Orcified, but was designed with that in mind.
106 lines
3.9 KiB
C
106 lines
3.9 KiB
C
/*
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* Image Scaling Functions
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* Copyright (c) 2005 David A. Schleef <ds@schleef.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __VS_IMAGE_H__
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#define __VS_IMAGE_H__
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#include <glib.h>
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#include <_stdint.h>
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typedef struct _VSImage VSImage;
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struct _VSImage {
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uint8_t *real_pixels;
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int real_width;
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int real_height;
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int border_left, border_right;
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int border_top, border_bottom;
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uint8_t *pixels;
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int width;
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int height;
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int stride;
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};
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void vs_image_scale_nearest_RGBA (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_RGBA (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_lanczos_AYUV (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf, double sharpness, gboolean dither, int submethod,
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double a, double sharpen);
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void vs_image_scale_nearest_RGB (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_RGB (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_YUYV (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_YUYV (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_UYVY (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_UYVY (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_Y (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_Y (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_lanczos_Y (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf, double sharpness, gboolean dither, int submethod,
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double a, double sharpen);
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void vs_image_scale_nearest_RGB565 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_RGB565 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_RGB555 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_RGB555 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_Y16 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_Y16 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_AYUV16 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_linear_AYUV16 (const VSImage *dest, const VSImage *src,
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uint8_t *tmpbuf);
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void vs_image_scale_nearest_AYUV64 (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf8);
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void vs_image_scale_linear_AYUV64 (const VSImage * dest, const VSImage * src,
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uint8_t * tmpbuf8);
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#endif
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