Index: ui/gfx/content_analysis.h |
diff --git a/ui/gfx/content_analysis.h b/ui/gfx/content_analysis.h |
new file mode 100644 |
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+// Copyright (c) 2013 The Chromium Authors. All rights reserved. |
+// Use of this source code is governed by a BSD-style license that can be |
+// found in the LICENSE file. |
+ |
+#ifndef UI_GFX_CONTENT_ANALYSIS_H_ |
+#define UI_GFX_CONTENT_ANALYSIS_H_ |
+ |
+#include <vector> |
+ |
+#include "base/basictypes.h" |
+#include "third_party/skia/include/core/SkColor.h" |
+#include "ui/base/ui_export.h" |
+#include "ui/gfx/rect.h" |
+#include "ui/gfx/size.h" |
+ |
+class SkBitmap; |
+ |
+namespace color_utils { |
+ |
+// Compute in-place gaussian gradient magnitude of |input_bitmap| with sigma |
+// |kernel_sigma|. |input_bitmap| is requried to be of SkBitmap::kA8_Config |
+// type. The routine computes first-order gaussian derivative on a |
+// gaussian-smoothed image. Beware, this is fairly slow since kernel size is |
+// 4 * kernel_sigma + 1. |
+UI_EXPORT void ApplyGaussianGradientMagnitudeFilter( |
+ SkBitmap* input_bitmap, |
+ float kernel_sigma); |
+ |
+// Accumulates vertical and horizontal sum of pixel values from a subsection of |
+// |input_bitmap| defined by |image_area|. The image is required to be of |
+// SkBitmap::kA8_Config type. |
+// If non-empty |target_size| is given, the routine will use it to process the |
+// profiles with closing operator sized to eliminate gaps which would be smaller |
+// than 1 pixel after rescaling to |target_size|. |
+// If |apply_log| is true, logarithm of counts are used for morhology (and |
+// returned). |
+UI_EXPORT void ExtractImageProfileInformation(const SkBitmap& input_bitmap, |
+ const gfx::Rect& image_area, |
+ const gfx::Size& target_size, |
+ bool apply_log, |
+ std::vector<float>* rows, |
+ std::vector<float>* columns); |
+ |
+// Compute a threshold value separating background (low) from signal (high) |
+// areas in the |input| profile. |
+UI_EXPORT float AutoSegmentPeaks(const std::vector<float>& input); |
+ |
+// Shrinks the source |bitmap| by removing rows and columns where |rows| and |
+// |columns| are false, respectively. The function returns a new bitmap if the |
+// shrinking can be performed and null otherwise. |
+UI_EXPORT SkBitmap* ComputeDecimatedImage(const SkBitmap& bitmap, |
+ const std::vector<bool>& rows, |
+ const std::vector<bool>& columns); |
+ |
+// Creates a new bitmap which contains only 'interesting' areas of |
+// |source_bitmap|. The |target_size| is used to estimate some computation |
+// parameters, but the resulting bitmap will not necessarily be of that size. |
+// |kernel_sigma| defines the degree of image smoothing in gradient computation. |
+// For a natural-sized (not shrunk) screenshot at 96 DPI and regular font size |
+// 5.0 was determined to be a good value. |
+UI_EXPORT SkBitmap* CreateRetargettedThumbnailImage( |
Alexei Svitkine (slow)
2013/04/11 18:25:37
If you're transferring ownership of the result to
motek.
2013/04/12 10:50:59
Done.
|
+ const SkBitmap& source_bitmap, |
+ const gfx::Size& target_size, |
+ float kernel_sigma); |
+} // namespace color_utils |
Alexei Svitkine (slow)
2013/04/11 18:25:37
Nit: Add a blank line before this.
motek.
2013/04/12 10:50:59
Done.
|
+ |
+#endif // UI_GFX_CONTENT_ANALYSIS_H_ |