godot/thirdparty/libwebp/src/enc/picture_rescale_enc.c

// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING file in the root of the source
// tree. An additional intellectual property rights grant can be found
// in the file PATENTS. All contributing project authors may
// be found in the AUTHORS file in the root of the source tree.
// -----------------------------------------------------------------------------
//
// WebPPicture tools: copy, crop, rescaling and view.
//
// Author: Skal ([email protected])

#include "src/webp/encode.h"

#include <assert.h>
#include <stdlib.h>

#include "src/enc/vp8i_enc.h"

#if !defined(WEBP_REDUCE_SIZE)
#include "src/utils/rescaler_utils.h"
#include "src/utils/utils.h"
#endif  // !defined(WEBP_REDUCE_SIZE)

#define HALVE(x) …

// Grab the 'specs' (writer, *opaque, width, height...) from 'src' and copy them
// into 'dst'. Mark 'dst' as not owning any memory.
static void PictureGrabSpecs(const WebPPicture* const src,
                             WebPPicture* const dst) { … }

//------------------------------------------------------------------------------

// Adjust top-left corner to chroma sample position.
static void SnapTopLeftPosition(const WebPPicture* const pic,
                                int* const left, int* const top) { … }

// Adjust top-left corner and verify that the sub-rectangle is valid.
static int AdjustAndCheckRectangle(const WebPPicture* const pic,
                                   int* const left, int* const top,
                                   int width, int height) { … }

#if !defined(WEBP_REDUCE_SIZE)
int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst) { … }
#endif  // !defined(WEBP_REDUCE_SIZE)

int WebPPictureIsView(const WebPPicture* picture) { … }

int WebPPictureView(const WebPPicture* src,
                    int left, int top, int width, int height,
                    WebPPicture* dst) { … }

#if !defined(WEBP_REDUCE_SIZE)
//------------------------------------------------------------------------------
// Picture cropping

int WebPPictureCrop(WebPPicture* pic,
                    int left, int top, int width, int height) { … }

//------------------------------------------------------------------------------
// Simple picture rescaler

static int RescalePlane(const uint8_t* src,
                        int src_width, int src_height, int src_stride,
                        uint8_t* dst,
                        int dst_width, int dst_height, int dst_stride,
                        rescaler_t* const work,
                        int num_channels) { … }

static void AlphaMultiplyARGB(WebPPicture* const pic, int inverse) { … }

static void AlphaMultiplyY(WebPPicture* const pic, int inverse) { … }

int WebPPictureRescale(WebPPicture* picture, int width, int height) { … }

#else  // defined(WEBP_REDUCE_SIZE)

int WebPPictureCopy(const WebPPicture* src, WebPPicture* dst) {
  (void)src;
  (void)dst;
  return 0;
}

int WebPPictureCrop(WebPPicture* pic,
                    int left, int top, int width, int height) {
  (void)pic;
  (void)left;
  (void)top;
  (void)width;
  (void)height;
  return 0;
}

int WebPPictureRescale(WebPPicture* pic, int width, int height) {
  (void)pic;
  (void)width;
  (void)height;
  return 0;
}
#endif  // !defined(WEBP_REDUCE_SIZE)