libwebp-0.6.0-rc1

third_party/libwebp/dec/buffer.c

Index: third_party/libwebp/dec/buffer.c
diff --git a/third_party/libwebp/dec/buffer.c b/third_party/libwebp/dec/buffer.c
deleted file mode 100644
index 547e69b434f8018f3712e64df27b449a4f1f168e..0000000000000000000000000000000000000000
--- a/third_party/libwebp/dec/buffer.c
+++ /dev/null
@@ -1,300 +0,0 @@
-// Copyright 2011 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.
-// -----------------------------------------------------------------------------
-//
-// Everything about WebPDecBuffer
-//
-// Author: Skal (pascal.massimino@gmail.com)
-
-#include <stdlib.h>
-
-#include "./vp8i.h"
-#include "./webpi.h"
-#include "../utils/utils.h"
-
-//------------------------------------------------------------------------------
-// WebPDecBuffer
-
-// Number of bytes per pixel for the different color-spaces.
-static const int kModeBpp[MODE_LAST] = {
-  3, 4, 3, 4, 4, 2, 2,
-  4, 4, 4, 2,    // pre-multiplied modes
-  1, 1 };
-
-// Check that webp_csp_mode is within the bounds of WEBP_CSP_MODE.
-// Convert to an integer to handle both the unsigned/signed enum cases
-// without the need for casting to remove type limit warnings.
-static int IsValidColorspace(int webp_csp_mode) {
-  return (webp_csp_mode >= MODE_RGB && webp_csp_mode < MODE_LAST);
-}
-
-// strictly speaking, the very last (or first, if flipped) row
-// doesn't require padding.
-#define MIN_BUFFER_SIZE(WIDTH, HEIGHT, STRIDE)       \
-    (uint64_t)(STRIDE) * ((HEIGHT) - 1) + (WIDTH)
-
-static VP8StatusCode CheckDecBuffer(const WebPDecBuffer* const buffer) {
-  int ok = 1;
-  const WEBP_CSP_MODE mode = buffer->colorspace;
-  const int width = buffer->width;
-  const int height = buffer->height;
-  if (!IsValidColorspace(mode)) {
-    ok = 0;
-  } else if (!WebPIsRGBMode(mode)) {   // YUV checks
-    const WebPYUVABuffer* const buf = &buffer->u.YUVA;
-    const int uv_width  = (width  + 1) / 2;
-    const int uv_height = (height + 1) / 2;
-    const int y_stride = abs(buf->y_stride);
-    const int u_stride = abs(buf->u_stride);
-    const int v_stride = abs(buf->v_stride);
-    const int a_stride = abs(buf->a_stride);
-    const uint64_t y_size = MIN_BUFFER_SIZE(width, height, y_stride);
-    const uint64_t u_size = MIN_BUFFER_SIZE(uv_width, uv_height, u_stride);
-    const uint64_t v_size = MIN_BUFFER_SIZE(uv_width, uv_height, v_stride);
-    const uint64_t a_size = MIN_BUFFER_SIZE(width, height, a_stride);
-    ok &= (y_size <= buf->y_size);
-    ok &= (u_size <= buf->u_size);
-    ok &= (v_size <= buf->v_size);
-    ok &= (y_stride >= width);
-    ok &= (u_stride >= uv_width);
-    ok &= (v_stride >= uv_width);
-    ok &= (buf->y != NULL);
-    ok &= (buf->u != NULL);
-    ok &= (buf->v != NULL);
-    if (mode == MODE_YUVA) {
-      ok &= (a_stride >= width);
-      ok &= (a_size <= buf->a_size);
-      ok &= (buf->a != NULL);
-    }
-  } else {    // RGB checks
-    const WebPRGBABuffer* const buf = &buffer->u.RGBA;
-    const int stride = abs(buf->stride);
-    const uint64_t size = MIN_BUFFER_SIZE(width, height, stride);
-    ok &= (size <= buf->size);
-    ok &= (stride >= width * kModeBpp[mode]);
-    ok &= (buf->rgba != NULL);
-  }
-  return ok ? VP8_STATUS_OK : VP8_STATUS_INVALID_PARAM;
-}
-#undef MIN_BUFFER_SIZE
-
-static VP8StatusCode AllocateBuffer(WebPDecBuffer* const buffer) {
-  const int w = buffer->width;
-  const int h = buffer->height;
-  const WEBP_CSP_MODE mode = buffer->colorspace;
-
-  if (w <= 0 || h <= 0 || !IsValidColorspace(mode)) {
-    return VP8_STATUS_INVALID_PARAM;
-  }
-
-  if (buffer->is_external_memory <= 0 && buffer->private_memory == NULL) {
-    uint8_t* output;
-    int uv_stride = 0, a_stride = 0;
-    uint64_t uv_size = 0, a_size = 0, total_size;
-    // We need memory and it hasn't been allocated yet.
-    // => initialize output buffer, now that dimensions are known.
-    const int stride = w * kModeBpp[mode];
-    const uint64_t size = (uint64_t)stride * h;
-
-    if (!WebPIsRGBMode(mode)) {
-      uv_stride = (w + 1) / 2;
-      uv_size = (uint64_t)uv_stride * ((h + 1) / 2);
-      if (mode == MODE_YUVA) {
-        a_stride = w;
-        a_size = (uint64_t)a_stride * h;
-      }
-    }
-    total_size = size + 2 * uv_size + a_size;
-
-    // Security/sanity checks
-    output = (uint8_t*)WebPSafeMalloc(total_size, sizeof(*output));
-    if (output == NULL) {
-      return VP8_STATUS_OUT_OF_MEMORY;
-    }
-    buffer->private_memory = output;
-
-    if (!WebPIsRGBMode(mode)) {   // YUVA initialization
-      WebPYUVABuffer* const buf = &buffer->u.YUVA;
-      buf->y = output;
-      buf->y_stride = stride;
-      buf->y_size = (size_t)size;
-      buf->u = output + size;
-      buf->u_stride = uv_stride;
-      buf->u_size = (size_t)uv_size;
-      buf->v = output + size + uv_size;
-      buf->v_stride = uv_stride;
-      buf->v_size = (size_t)uv_size;
-      if (mode == MODE_YUVA) {
-        buf->a = output + size + 2 * uv_size;
-      }
-      buf->a_size = (size_t)a_size;
-      buf->a_stride = a_stride;
-    } else {  // RGBA initialization
-      WebPRGBABuffer* const buf = &buffer->u.RGBA;
-      buf->rgba = output;
-      buf->stride = stride;
-      buf->size = (size_t)size;
-    }
-  }
-  return CheckDecBuffer(buffer);
-}
-
-VP8StatusCode WebPFlipBuffer(WebPDecBuffer* const buffer) {
-  if (buffer == NULL) {
-    return VP8_STATUS_INVALID_PARAM;
-  }
-  if (WebPIsRGBMode(buffer->colorspace)) {
-    WebPRGBABuffer* const buf = &buffer->u.RGBA;
-    buf->rgba += (buffer->height - 1) * buf->stride;
-    buf->stride = -buf->stride;
-  } else {
-    WebPYUVABuffer* const buf = &buffer->u.YUVA;
-    const int H = buffer->height;
-    buf->y += (H - 1) * buf->y_stride;
-    buf->y_stride = -buf->y_stride;
-    buf->u += ((H - 1) >> 1) * buf->u_stride;
-    buf->u_stride = -buf->u_stride;
-    buf->v += ((H - 1) >> 1) * buf->v_stride;
-    buf->v_stride = -buf->v_stride;
-    if (buf->a != NULL) {
-      buf->a += (H - 1) * buf->a_stride;
-      buf->a_stride = -buf->a_stride;
-    }
-  }
-  return VP8_STATUS_OK;
-}
-
-VP8StatusCode WebPAllocateDecBuffer(int w, int h,
-                                    const WebPDecoderOptions* const options,
-                                    WebPDecBuffer* const out) {
-  VP8StatusCode status;
-  if (out == NULL || w <= 0 || h <= 0) {
-    return VP8_STATUS_INVALID_PARAM;
-  }
-  if (options != NULL) {    // First, apply options if there is any.
-    if (options->use_cropping) {
-      const int cw = options->crop_width;
-      const int ch = options->crop_height;
-      const int x = options->crop_left & ~1;
-      const int y = options->crop_top & ~1;
-      if (x < 0 || y < 0 || cw <= 0 || ch <= 0 || x + cw > w || y + ch > h) {
-        return VP8_STATUS_INVALID_PARAM;   // out of frame boundary.
-      }
-      w = cw;
-      h = ch;
-    }
-    if (options->use_scaling) {
-      int scaled_width = options->scaled_width;
-      int scaled_height = options->scaled_height;
-      if (!WebPRescalerGetScaledDimensions(
-              w, h, &scaled_width, &scaled_height)) {
-        return VP8_STATUS_INVALID_PARAM;
-      }
-      w = scaled_width;
-      h = scaled_height;
-    }
-  }
-  out->width = w;
-  out->height = h;
-
-  // Then, allocate buffer for real.
-  status = AllocateBuffer(out);
-  if (status != VP8_STATUS_OK) return status;
-
-  // Use the stride trick if vertical flip is needed.
-  if (options != NULL && options->flip) {
-    status = WebPFlipBuffer(out);
-  }
-  return status;
-}
-
-//------------------------------------------------------------------------------
-// constructors / destructors
-
-int WebPInitDecBufferInternal(WebPDecBuffer* buffer, int version) {
-  if (WEBP_ABI_IS_INCOMPATIBLE(version, WEBP_DECODER_ABI_VERSION)) {
-    return 0;  // version mismatch
-  }
-  if (buffer == NULL) return 0;
-  memset(buffer, 0, sizeof(*buffer));
-  return 1;
-}
-
-void WebPFreeDecBuffer(WebPDecBuffer* buffer) {
-  if (buffer != NULL) {
-    if (buffer->is_external_memory <= 0) {
-      WebPSafeFree(buffer->private_memory);
-    }
-    buffer->private_memory = NULL;
-  }
-}
-
-void WebPCopyDecBuffer(const WebPDecBuffer* const src,
-                       WebPDecBuffer* const dst) {
-  if (src != NULL && dst != NULL) {
-    *dst = *src;
-    if (src->private_memory != NULL) {
-      dst->is_external_memory = 1;   // dst buffer doesn't own the memory.
-      dst->private_memory = NULL;
-    }
-  }
-}
-
-// Copy and transfer ownership from src to dst (beware of parameter order!)
-void WebPGrabDecBuffer(WebPDecBuffer* const src, WebPDecBuffer* const dst) {
-  if (src != NULL && dst != NULL) {
-    *dst = *src;
-    if (src->private_memory != NULL) {
-      src->is_external_memory = 1;   // src relinquishes ownership
-      src->private_memory = NULL;
-    }
-  }
-}
-
-VP8StatusCode WebPCopyDecBufferPixels(const WebPDecBuffer* const src_buf,
-                                      WebPDecBuffer* const dst_buf) {
-  assert(src_buf != NULL && dst_buf != NULL);
-  assert(src_buf->colorspace == dst_buf->colorspace);
-
-  dst_buf->width = src_buf->width;
-  dst_buf->height = src_buf->height;
-  if (CheckDecBuffer(dst_buf) != VP8_STATUS_OK) {
-    return VP8_STATUS_INVALID_PARAM;
-  }
-  if (WebPIsRGBMode(src_buf->colorspace)) {
-    const WebPRGBABuffer* const src = &src_buf->u.RGBA;
-    const WebPRGBABuffer* const dst = &dst_buf->u.RGBA;
-    WebPCopyPlane(src->rgba, src->stride, dst->rgba, dst->stride,
-                  src_buf->width * kModeBpp[src_buf->colorspace],
-                  src_buf->height);
-  } else {
-    const WebPYUVABuffer* const src = &src_buf->u.YUVA;
-    const WebPYUVABuffer* const dst = &dst_buf->u.YUVA;
-    WebPCopyPlane(src->y, src->y_stride, dst->y, dst->y_stride,
-                  src_buf->width, src_buf->height);
-    WebPCopyPlane(src->u, src->u_stride, dst->u, dst->u_stride,
-                  (src_buf->width + 1) / 2, (src_buf->height + 1) / 2);
-    WebPCopyPlane(src->v, src->v_stride, dst->v, dst->v_stride,
-                  (src_buf->width + 1) / 2, (src_buf->height + 1) / 2);
-    if (WebPIsAlphaMode(src_buf->colorspace)) {
-      WebPCopyPlane(src->a, src->a_stride, dst->a, dst->a_stride,
-                    src_buf->width, src_buf->height);
-    }
-  }
-  return VP8_STATUS_OK;
-}
-
-int WebPAvoidSlowMemory(const WebPDecBuffer* const output,
-                        const WebPBitstreamFeatures* const features) {
-  assert(output != NULL);
-  return (output->is_external_memory >= 2) &&
-         WebPIsPremultipliedMode(output->colorspace) &&
-         (features != NULL && features->has_alpha);
-}
-
-//------------------------------------------------------------------------------