tools/sk_tool_utils.h - platform/external/skia - Gitiles

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */

 #ifndef sk_tool_utils_DEFINED
 #define sk_tool_utils_DEFINED

 #include "SkColor.h"
 #include "SkImageEncoder.h"
 #include "SkImageInfo.h"
 #include "SkRandom.h"
 #include "SkRefCnt.h"
 #include "SkStream.h"
 #include "SkTDArray.h"
 #include "SkTypeface.h"

 class SkBitmap;
 class SkCanvas;
 class SkColorFilter;
 class SkImage;
 class SkPaint;
 class SkPath;
 class SkRRect;
 class SkShader;
 class SkSurface;
 class SkSurfaceProps;
 class SkTestFont;
 class SkTextBlobBuilder;

 namespace sk_tool_utils {

     const char* alphatype_name(SkAlphaType);
     const char* colortype_name(SkColorType);

     /**
      * Map opaque colors from 8888 to 565.
      */
     SkColor color_to_565(SkColor color);

     /**
      * Return a color emoji typeface if available.
      */
     sk_sp<SkTypeface> emoji_typeface();

     /**
      * If the platform supports color emoji, return sample text the emoji can render.
      */
     const char* emoji_sample_text();

     /**
      * Returns a string describing the platform font manager, if we're using one, otherwise "".
      */
     const char* platform_font_manager();

     /**
      * Sets the paint to use a platform-independent text renderer
      */
     void set_portable_typeface(SkPaint* paint, const char* name = nullptr,
                                SkFontStyle style = SkFontStyle());

     /**
      * Returns a platform-independent text renderer.
      */
     sk_sp<SkTypeface> create_portable_typeface(const char* name, SkFontStyle style);

     /** Call to clean up portable font references. */
     void release_portable_typefaces();

     /**
      *  Call writePixels() by using the pixels from bitmap, but with an info that claims
      *  the pixels are colorType + alphaType
      */
     void write_pixels(SkCanvas*, const SkBitmap&, int x, int y, SkColorType, SkAlphaType);
     void write_pixels(SkSurface*, const SkBitmap&, int x, int y, SkColorType, SkAlphaType);

     /**
      *  Returns true iff all of the pixels between the two images differ by <= the maxDiff value
      *  per component.
      *
      *  If the configs differ, return false.
      *
      *  If the colorType is half-float, then maxDiff is interpreted as 0..255 --> 0..1
      */
     bool equal_pixels(const SkPixmap&, const SkPixmap&, unsigned maxDiff = 0,
                       bool respectColorSpaces = false);
     bool equal_pixels(const SkBitmap&, const SkBitmap&, unsigned maxDiff = 0,
                       bool respectColorSpaces = false);
     bool equal_pixels(const SkImage* a, const SkImage* b, unsigned maxDiff = 0,
                       bool respectColorSpaces = false);

     // private to sk_tool_utils
     sk_sp<SkTypeface> create_font(const char* name, SkFontStyle);

     /** Returns a newly created CheckerboardShader. */
     sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size);

     /** Draw a checkerboard pattern in the current canvas, restricted to
         the current clip, using SkXfermode::kSrc_Mode. */
     void draw_checkerboard(SkCanvas* canvas,
                            SkColor color1,
                            SkColor color2,
                            int checkSize);

     /** Make it easier to create a bitmap-based checkerboard */
     SkBitmap create_checkerboard_bitmap(int w, int h,
                                         SkColor c1, SkColor c2,
                                         int checkSize);

     /** A default checkerboard. */
     inline void draw_checkerboard(SkCanvas* canvas) {
         sk_tool_utils::draw_checkerboard(canvas, 0xFF999999, 0xFF666666, 8);
     }

     SkBitmap create_string_bitmap(int w, int h, SkColor c, int x, int y,
                                   int textSize, const char* str);

     // If the canvas does't make a surface (e.g. recording), make a raster surface
     sk_sp<SkSurface> makeSurface(SkCanvas*, const SkImageInfo&, const SkSurfaceProps* = nullptr);

     // A helper for inserting a drawtext call into a SkTextBlobBuilder
     void add_to_text_blob_w_len(SkTextBlobBuilder* builder, const char* text, size_t len,
                                 const SkPaint& origPaint, SkScalar x, SkScalar y);

     void add_to_text_blob(SkTextBlobBuilder* builder, const char* text,
                           const SkPaint& origPaint, SkScalar x, SkScalar y);

     // Constructs a star by walking a 'numPts'-sided regular polygon with even/odd fill:
     //
     //   moveTo(pts[0]);
     //   lineTo(pts[step % numPts]);
     //   ...
     //   lineTo(pts[(step * (N - 1)) % numPts]);
     //
     // numPts=5, step=2 will produce a classic five-point star.
     //
     // numPts and step must be co-prime.
     SkPath make_star(const SkRect& bounds, int numPts = 5, int step = 2);

     void make_big_path(SkPath& path);

     // Return a blurred version of 'src'. This doesn't use a separable filter
     // so it is slow!
     SkBitmap slow_blur(const SkBitmap& src, float sigma);

     SkRect compute_central_occluder(const SkRRect& rr);
     SkRect compute_widest_occluder(const SkRRect& rr);
     SkRect compute_tallest_occluder(const SkRRect& rr);

     // A helper object to test the topological sorting code (TopoSortBench.cpp & TopoSortTest.cpp)
     class TopoTestNode : public SkRefCnt {
     public:
         TopoTestNode(int id) : fID(id), fOutputPos(-1), fTempMark(false) { }

         void dependsOn(TopoTestNode* src) {
             *fDependencies.append() = src;
         }

         int id() const { return fID; }
         void reset() { fOutputPos = -1; }

         int outputPos() const { return fOutputPos; }

         // check that the topological sort is valid for this node
         bool check() {
             if (-1 == fOutputPos) {
                 return false;
             }

             for (int i = 0; i < fDependencies.count(); ++i) {
                 if (-1 == fDependencies[i]->outputPos()) {
                     return false;
                 }
                 // This node should've been output after all the nodes on which it depends
                 if (fOutputPos < fDependencies[i]->outputPos()) {
                     return false;
                 }
             }

             return true;
         }

         // The following 7 methods are needed by the topological sort
         static void SetTempMark(TopoTestNode* node) { node->fTempMark = true; }
         static void ResetTempMark(TopoTestNode* node) { node->fTempMark = false; }
         static bool IsTempMarked(TopoTestNode* node) { return node->fTempMark; }
         static void Output(TopoTestNode* node, int outputPos) {
             SkASSERT(-1 != outputPos);
             node->fOutputPos = outputPos;
         }
         static bool WasOutput(TopoTestNode* node) { return (-1 != node->fOutputPos); }
         static int NumDependencies(TopoTestNode* node) { return node->fDependencies.count(); }
         static TopoTestNode* Dependency(TopoTestNode* node, int index) {
             return node->fDependencies[index];
         }

         // Helper functions for TopoSortBench & TopoSortTest
         static void AllocNodes(SkTArray<sk_sp<sk_tool_utils::TopoTestNode>>* graph, int num) {
             graph->reserve(num);

             for (int i = 0; i < num; ++i) {
                 graph->push_back(sk_sp<TopoTestNode>(new TopoTestNode(i)));
             }
         }

 #ifdef SK_DEBUG
         static void Print(const SkTArray<TopoTestNode*>& graph) {
             for (int i = 0; i < graph.count(); ++i) {
                 SkDebugf("%d, ", graph[i]->id());
             }
             SkDebugf("\n");
         }
 #endif

         // randomize the array
         static void Shuffle(SkTArray<sk_sp<TopoTestNode>>* graph, SkRandom* rand) {
             for (int i = graph->count()-1; i > 0; --i) {
                 int swap = rand->nextU() % (i+1);

                 (*graph)[i].swap((*graph)[swap]);
             }
         }

     private:
         int  fID;
         int  fOutputPos;
         bool fTempMark;

         SkTDArray<TopoTestNode*> fDependencies;
     };

     template <typename T>
     inline bool EncodeImageToFile(const char* path, const T& src, SkEncodedImageFormat f, int q) {
         SkFILEWStream file(path);
         return file.isValid() && SkEncodeImage(&file, src, f, q);
     }

     template <typename T>
     inline sk_sp<SkData> EncodeImageToData(const T& src, SkEncodedImageFormat f, int q) {
         SkDynamicMemoryWStream buf;
         return SkEncodeImage(&buf, src , f, q) ? buf.detachAsData() : nullptr;
     }

     bool copy_to(SkBitmap* dst, SkColorType dstCT, const SkBitmap& src);
     void copy_to_g8(SkBitmap* dst, const SkBitmap& src);
 }  // namespace sk_tool_utils

 #endif  // sk_tool_utils_DEFINED
	/*
	* Copyright 2014 Google Inc.
	*
	* Use of this source code is governed by a BSD-style license that can be
	* found in the LICENSE file.
	*/

	#ifndef sk_tool_utils_DEFINED
	#define sk_tool_utils_DEFINED

	#include "SkColor.h"
	#include "SkImageEncoder.h"
	#include "SkImageInfo.h"
	#include "SkRandom.h"
	#include "SkRefCnt.h"
	#include "SkStream.h"
	#include "SkTDArray.h"
	#include "SkTypeface.h"

	class SkBitmap;
	class SkCanvas;
	class SkColorFilter;
	class SkImage;
	class SkPaint;
	class SkPath;
	class SkRRect;
	class SkShader;
	class SkSurface;
	class SkSurfaceProps;
	class SkTestFont;
	class SkTextBlobBuilder;

	namespace sk_tool_utils {

	const char* alphatype_name(SkAlphaType);
	const char* colortype_name(SkColorType);

	/**
	* Map opaque colors from 8888 to 565.
	*/
	SkColor color_to_565(SkColor color);

	/**
	* Return a color emoji typeface if available.
	*/
	sk_sp<SkTypeface> emoji_typeface();

	/**
	* If the platform supports color emoji, return sample text the emoji can render.
	*/
	const char* emoji_sample_text();

	/**
	* Returns a string describing the platform font manager, if we're using one, otherwise "".
	*/
	const char* platform_font_manager();

	/**
	* Sets the paint to use a platform-independent text renderer
	*/
	void set_portable_typeface(SkPaint* paint, const char* name = nullptr,
	SkFontStyle style = SkFontStyle());

	/**
	* Returns a platform-independent text renderer.
	*/
	sk_sp<SkTypeface> create_portable_typeface(const char* name, SkFontStyle style);

	/** Call to clean up portable font references. */
	void release_portable_typefaces();

	/**
	* Call writePixels() by using the pixels from bitmap, but with an info that claims
	* the pixels are colorType + alphaType
	*/
	void write_pixels(SkCanvas*, const SkBitmap&, int x, int y, SkColorType, SkAlphaType);
	void write_pixels(SkSurface*, const SkBitmap&, int x, int y, SkColorType, SkAlphaType);

	/**
	* Returns true iff all of the pixels between the two images differ by <= the maxDiff value
	* per component.
	*
	* If the configs differ, return false.
	*
	* If the colorType is half-float, then maxDiff is interpreted as 0..255 --> 0..1
	*/
	bool equal_pixels(const SkPixmap&, const SkPixmap&, unsigned maxDiff = 0,
	bool respectColorSpaces = false);
	bool equal_pixels(const SkBitmap&, const SkBitmap&, unsigned maxDiff = 0,
	bool respectColorSpaces = false);
	bool equal_pixels(const SkImage* a, const SkImage* b, unsigned maxDiff = 0,
	bool respectColorSpaces = false);

	// private to sk_tool_utils
	sk_sp<SkTypeface> create_font(const char* name, SkFontStyle);

	/** Returns a newly created CheckerboardShader. */
	sk_sp<SkShader> create_checkerboard_shader(SkColor c1, SkColor c2, int size);

	/** Draw a checkerboard pattern in the current canvas, restricted to
	the current clip, using SkXfermode::kSrc_Mode. */
	void draw_checkerboard(SkCanvas* canvas,
	SkColor color1,
	SkColor color2,
	int checkSize);

	/** Make it easier to create a bitmap-based checkerboard */
	SkBitmap create_checkerboard_bitmap(int w, int h,
	SkColor c1, SkColor c2,
	int checkSize);

	/** A default checkerboard. */
	inline void draw_checkerboard(SkCanvas* canvas) {
	sk_tool_utils::draw_checkerboard(canvas, 0xFF999999, 0xFF666666, 8);
	}

	SkBitmap create_string_bitmap(int w, int h, SkColor c, int x, int y,
	int textSize, const char* str);

	// If the canvas does't make a surface (e.g. recording), make a raster surface
	sk_sp<SkSurface> makeSurface(SkCanvas, const SkImageInfo&, const SkSurfaceProps = nullptr);

	// A helper for inserting a drawtext call into a SkTextBlobBuilder
	void add_to_text_blob_w_len(SkTextBlobBuilder* builder, const char* text, size_t len,
	const SkPaint& origPaint, SkScalar x, SkScalar y);

	void add_to_text_blob(SkTextBlobBuilder* builder, const char* text,
	const SkPaint& origPaint, SkScalar x, SkScalar y);

	// Constructs a star by walking a 'numPts'-sided regular polygon with even/odd fill:
	//
	// moveTo(pts[0]);
	// lineTo(pts[step % numPts]);
	// ...
	// lineTo(pts[(step * (N - 1)) % numPts]);
	//
	// numPts=5, step=2 will produce a classic five-point star.
	//
	// numPts and step must be co-prime.
	SkPath make_star(const SkRect& bounds, int numPts = 5, int step = 2);

	void make_big_path(SkPath& path);

	// Return a blurred version of 'src'. This doesn't use a separable filter
	// so it is slow!
	SkBitmap slow_blur(const SkBitmap& src, float sigma);

	SkRect compute_central_occluder(const SkRRect& rr);
	SkRect compute_widest_occluder(const SkRRect& rr);
	SkRect compute_tallest_occluder(const SkRRect& rr);

	// A helper object to test the topological sorting code (TopoSortBench.cpp & TopoSortTest.cpp)
	class TopoTestNode : public SkRefCnt {
	public:
	TopoTestNode(int id) : fID(id), fOutputPos(-1), fTempMark(false) { }

	void dependsOn(TopoTestNode* src) {
	*fDependencies.append() = src;
	}

	int id() const { return fID; }
	void reset() { fOutputPos = -1; }

	int outputPos() const { return fOutputPos; }

	// check that the topological sort is valid for this node
	bool check() {
	if (-1 == fOutputPos) {
	return false;
	}

	for (int i = 0; i < fDependencies.count(); ++i) {
	if (-1 == fDependencies[i]->outputPos()) {
	return false;
	}
	// This node should've been output after all the nodes on which it depends
	if (fOutputPos < fDependencies[i]->outputPos()) {
	return false;
	}
	}

	return true;
	}

	// The following 7 methods are needed by the topological sort
	static void SetTempMark(TopoTestNode* node) { node->fTempMark = true; }
	static void ResetTempMark(TopoTestNode* node) { node->fTempMark = false; }
	static bool IsTempMarked(TopoTestNode* node) { return node->fTempMark; }
	static void Output(TopoTestNode* node, int outputPos) {
	SkASSERT(-1 != outputPos);
	node->fOutputPos = outputPos;
	}
	static bool WasOutput(TopoTestNode* node) { return (-1 != node->fOutputPos); }
	static int NumDependencies(TopoTestNode* node) { return node->fDependencies.count(); }
	static TopoTestNode* Dependency(TopoTestNode* node, int index) {
	return node->fDependencies[index];
	}

	// Helper functions for TopoSortBench & TopoSortTest
	static void AllocNodes(SkTArray<sk_sp<sk_tool_utils::TopoTestNode>>* graph, int num) {
	graph->reserve(num);

	for (int i = 0; i < num; ++i) {
	graph->push_back(sk_sp<TopoTestNode>(new TopoTestNode(i)));
	}
	}

	#ifdef SK_DEBUG
	static void Print(const SkTArray<TopoTestNode*>& graph) {
	for (int i = 0; i < graph.count(); ++i) {
	SkDebugf("%d, ", graph[i]->id());
	}
	SkDebugf("\n");
	}
	#endif

	// randomize the array
	static void Shuffle(SkTArray<sk_sp<TopoTestNode>>* graph, SkRandom* rand) {
	for (int i = graph->count()-1; i > 0; --i) {
	int swap = rand->nextU() % (i+1);

	(graph)[i].swap((graph)[swap]);
	}
	}

	private:
	int fID;
	int fOutputPos;
	bool fTempMark;

	SkTDArray<TopoTestNode*> fDependencies;
	};

	template <typename T>
	inline bool EncodeImageToFile(const char* path, const T& src, SkEncodedImageFormat f, int q) {
	SkFILEWStream file(path);
	return file.isValid() && SkEncodeImage(&file, src, f, q);
	}

	template <typename T>
	inline sk_sp<SkData> EncodeImageToData(const T& src, SkEncodedImageFormat f, int q) {
	SkDynamicMemoryWStream buf;
	return SkEncodeImage(&buf, src , f, q) ? buf.detachAsData() : nullptr;
	}

	bool copy_to(SkBitmap* dst, SkColorType dstCT, const SkBitmap& src);
	void copy_to_g8(SkBitmap* dst, const SkBitmap& src);
	} // namespace sk_tool_utils

	#endif // sk_tool_utils_DEFINED