3c089d751e
We must remove dependency on Chromium, i.e. we can't use Chromium's base/logging.h. That means we need to define these macros in WebRTC also when doing Chromium builds. And this causes redefinition. * DISALLOW_ASSIGN -> RTC_DISALLOW_ASSIGN * DISALLOW_COPY_AND_ASSIGN -> RTC_DISALLOW_COPY_AND_ASSIGN * DISALLOW_IMPLICIT_CONSTRUCTORS -> RTC_DISALLOW_IMPLICIT_CONSTRUCTORS Related CL: https://codereview.webrtc.org/1335923002/ BUG=chromium:468375 NOTRY=true Review URL: https://codereview.webrtc.org/1345433002 Cr-Commit-Position: refs/heads/master@{#9953}
90 lines
3.1 KiB
C++
90 lines
3.1 KiB
C++
/*
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* Copyright (c) 2013 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_H_
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#define WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_H_
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#include <vector>
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#include "webrtc/base/scoped_ptr.h"
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#include "webrtc/modules/desktop_capture/desktop_region.h"
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namespace webrtc {
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// TODO(sergeyu): Simplify differ now that we are working with DesktopRegion.
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// diff_info_ should no longer be needed, as we can put our data directly into
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// the region that we are calculating.
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// http://crbug.com/92379
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// TODO(sergeyu): Rename this class to something more sensible, e.g.
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// ScreenCaptureFrameDifferencer.
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class Differ {
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public:
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// Create a differ that operates on bitmaps with the specified width, height
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// and bytes_per_pixel.
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Differ(int width, int height, int bytes_per_pixel, int stride);
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~Differ();
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int width() { return width_; }
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int height() { return height_; }
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int bytes_per_pixel() { return bytes_per_pixel_; }
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int bytes_per_row() { return bytes_per_row_; }
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// Given the previous and current screen buffer, calculate the dirty region
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// that encloses all of the changed pixels in the new screen.
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void CalcDirtyRegion(const uint8_t* prev_buffer, const uint8_t* curr_buffer,
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DesktopRegion* region);
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private:
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// Allow tests to access our private parts.
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friend class DifferTest;
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// Identify all of the blocks that contain changed pixels.
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void MarkDirtyBlocks(const uint8_t* prev_buffer, const uint8_t* curr_buffer);
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// After the dirty blocks have been identified, this routine merges adjacent
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// blocks into a region.
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// The goal is to minimize the region that covers the dirty blocks.
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void MergeBlocks(DesktopRegion* region);
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// Checks whether the upper-left portions of the buffers are equal. The size
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// of the portion to check is specified by the |width| and |height| values.
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// Note that if we force the capturer to always return images whose width and
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// height are multiples of kBlockSize, then this will never be called.
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bool PartialBlocksEqual(const uint8_t* prev_buffer,
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const uint8_t* curr_buffer,
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int stride,
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int width, int height);
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// Dimensions of screen.
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int width_;
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int height_;
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// Number of bytes for each pixel in source and dest bitmap.
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// (Yes, they must match.)
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int bytes_per_pixel_;
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// Number of bytes in each row of the image (AKA: stride).
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int bytes_per_row_;
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// Diff information for each block in the image.
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rtc::scoped_ptr<bool[]> diff_info_;
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// Dimensions and total size of diff info array.
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int diff_info_width_;
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int diff_info_height_;
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int diff_info_size_;
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RTC_DISALLOW_COPY_AND_ASSIGN(Differ);
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};
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} // namespace webrtc
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#endif // WEBRTC_MODULES_DESKTOP_CAPTURE_DIFFER_H_
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