| /* |
| * Copyright 2006 The Android Open Source Project |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #ifndef SkCanvas_DEFINED |
| #define SkCanvas_DEFINED |
| |
| #include "SkTypes.h" |
| #include "SkBitmap.h" |
| #include "SkDeque.h" |
| #include "SkPaint.h" |
| #include "SkRefCnt.h" |
| #include "SkRegion.h" |
| #include "SkSurfaceProps.h" |
| #include "SkXfermode.h" |
| |
| class GrContext; |
| class GrRenderTarget; |
| class SkBaseDevice; |
| class SkCanvasClipVisitor; |
| class SkClipStack; |
| class SkDraw; |
| class SkDrawable; |
| class SkDrawFilter; |
| class SkImage; |
| class SkImageFilter; |
| class SkMetaData; |
| class SkPath; |
| class SkPicture; |
| class SkPixmap; |
| class SkRRect; |
| struct SkRSXform; |
| class SkSurface; |
| class SkSurface_Base; |
| class SkTextBlob; |
| |
| /** \class SkCanvas |
| |
| A Canvas encapsulates all of the state about drawing into a device (bitmap). |
| This includes a reference to the device itself, and a stack of matrix/clip |
| values. For any given draw call (e.g. drawRect), the geometry of the object |
| being drawn is transformed by the concatenation of all the matrices in the |
| stack. The transformed geometry is clipped by the intersection of all of |
| the clips in the stack. |
| |
| While the Canvas holds the state of the drawing device, the state (style) |
| of the object being drawn is held by the Paint, which is provided as a |
| parameter to each of the draw() methods. The Paint holds attributes such as |
| color, typeface, textSize, strokeWidth, shader (e.g. gradients, patterns), |
| etc. |
| */ |
| class SK_API SkCanvas : public SkRefCnt { |
| public: |
| /** |
| * Attempt to allocate raster canvas, matching the ImageInfo, that will draw directly into the |
| * specified pixels. To access the pixels after drawing to them, the caller should call |
| * flush() or call peekPixels(...). |
| * |
| * On failure, return NULL. This can fail for several reasons: |
| * 1. invalid ImageInfo (e.g. negative dimensions) |
| * 2. unsupported ImageInfo for a canvas |
| * - kUnknown_SkColorType, kIndex_8_SkColorType |
| * - kUnknown_SkAlphaType |
| * - this list is not complete, so others may also be unsupported |
| * |
| * Note: it is valid to request a supported ImageInfo, but with zero |
| * dimensions. |
| */ |
| static SkCanvas* NewRasterDirect(const SkImageInfo&, void*, size_t); |
| |
| static SkCanvas* NewRasterDirectN32(int width, int height, SkPMColor* pixels, size_t rowBytes) { |
| return NewRasterDirect(SkImageInfo::MakeN32Premul(width, height), pixels, rowBytes); |
| } |
| |
| /** |
| * Creates an empty canvas with no backing device/pixels, and zero |
| * dimensions. |
| */ |
| SkCanvas(); |
| |
| /** |
| * Creates a canvas of the specified dimensions, but explicitly not backed |
| * by any device/pixels. Typically this use used by subclasses who handle |
| * the draw calls in some other way. |
| */ |
| SkCanvas(int width, int height, const SkSurfaceProps* = NULL); |
| |
| /** Construct a canvas with the specified device to draw into. |
| |
| @param device Specifies a device for the canvas to draw into. |
| */ |
| explicit SkCanvas(SkBaseDevice* device); |
| |
| /** Construct a canvas with the specified bitmap to draw into. |
| @param bitmap Specifies a bitmap for the canvas to draw into. Its |
| structure are copied to the canvas. |
| */ |
| explicit SkCanvas(const SkBitmap& bitmap); |
| |
| /** Construct a canvas with the specified bitmap to draw into. |
| @param bitmap Specifies a bitmap for the canvas to draw into. Its |
| structure are copied to the canvas. |
| @param props New canvas surface properties. |
| */ |
| SkCanvas(const SkBitmap& bitmap, const SkSurfaceProps& props); |
| |
| virtual ~SkCanvas(); |
| |
| SkMetaData& getMetaData(); |
| |
| /** |
| * Return ImageInfo for this canvas. If the canvas is not backed by pixels |
| * (cpu or gpu), then the info's ColorType will be kUnknown_SkColorType. |
| */ |
| SkImageInfo imageInfo() const; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Trigger the immediate execution of all pending draw operations. |
| */ |
| void flush(); |
| |
| /** |
| * Gets the size of the base or root layer in global canvas coordinates. The |
| * origin of the base layer is always (0,0). The current drawable area may be |
| * smaller (due to clipping or saveLayer). |
| */ |
| virtual SkISize getBaseLayerSize() const; |
| |
| /** |
| * DEPRECATED: call getBaseLayerSize |
| */ |
| SkISize getDeviceSize() const { return this->getBaseLayerSize(); } |
| |
| /** |
| * DEPRECATED. |
| * Return the canvas' device object, which may be null. The device holds |
| * the bitmap of the pixels that the canvas draws into. The reference count |
| * of the returned device is not changed by this call. |
| */ |
| #ifndef SK_SUPPORT_LEGACY_GETDEVICE |
| protected: // Can we make this private? |
| #endif |
| SkBaseDevice* getDevice() const; |
| public: |
| SkBaseDevice* getDevice_just_for_deprecated_compatibility_testing() const { |
| return this->getDevice(); |
| } |
| |
| /** |
| * saveLayer() can create another device (which is later drawn onto |
| * the previous device). getTopDevice() returns the top-most device current |
| * installed. Note that this can change on other calls like save/restore, |
| * so do not access this device after subsequent canvas calls. |
| * The reference count of the device is not changed. |
| * |
| * @param updateMatrixClip If this is true, then before the device is |
| * returned, we ensure that its has been notified about the current |
| * matrix and clip. Note: this happens automatically when the device |
| * is drawn to, but is optional here, as there is a small perf hit |
| * sometimes. |
| */ |
| #ifndef SK_SUPPORT_LEGACY_GETTOPDEVICE |
| private: |
| #endif |
| SkBaseDevice* getTopDevice(bool updateMatrixClip = false) const; |
| public: |
| |
| /** |
| * Create a new surface matching the specified info, one that attempts to |
| * be maximally compatible when used with this canvas. If there is no matching Surface type, |
| * NULL is returned. |
| * |
| * If surfaceprops is specified, those are passed to the new surface, otherwise the new surface |
| * inherits the properties of the surface that owns this canvas. If this canvas has no parent |
| * surface, then the new surface is created with default properties. |
| */ |
| SkSurface* newSurface(const SkImageInfo&, const SkSurfaceProps* = NULL); |
| |
| /** |
| * Return the GPU context of the device that is associated with the canvas. |
| * For a canvas with non-GPU device, NULL is returned. |
| */ |
| GrContext* getGrContext(); |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * If the canvas has writable pixels in its top layer (and is not recording to a picture |
| * or other non-raster target) and has direct access to its pixels (i.e. they are in |
| * local RAM) return the address of those pixels, and if not null, |
| * return the ImageInfo, rowBytes and origin. The returned address is only valid |
| * while the canvas object is in scope and unchanged. Any API calls made on |
| * canvas (or its parent surface if any) will invalidate the |
| * returned address (and associated information). |
| * |
| * On failure, returns NULL and the info, rowBytes, and origin parameters are ignored. |
| */ |
| void* accessTopLayerPixels(SkImageInfo* info, size_t* rowBytes, SkIPoint* origin = NULL); |
| |
| /** |
| * If the canvas has readable pixels in its base layer (and is not recording to a picture |
| * or other non-raster target) and has direct access to its pixels (i.e. they are in |
| * local RAM) return the const-address of those pixels, and if not null, |
| * return the ImageInfo and rowBytes. The returned address is only valid |
| * while the canvas object is in scope and unchanged. Any API calls made on |
| * canvas (or its parent surface if any) will invalidate the |
| * returned address (and associated information). |
| * |
| * On failure, returns NULL and the info and rowBytes parameters are |
| * ignored. |
| */ |
| const void* peekPixels(SkImageInfo* info, size_t* rowBytes); |
| |
| /** |
| * Copy the pixels from the base-layer into the specified buffer (pixels + rowBytes), |
| * converting them into the requested format (SkImageInfo). The base-layer pixels are read |
| * starting at the specified (srcX,srcY) location in the coordinate system of the base-layer. |
| * |
| * The specified ImageInfo and (srcX,srcY) offset specifies a source rectangle |
| * |
| * srcR.setXYWH(srcX, srcY, dstInfo.width(), dstInfo.height()); |
| * |
| * srcR is intersected with the bounds of the base-layer. If this intersection is not empty, |
| * then we have two sets of pixels (of equal size). Replace the dst pixels with the |
| * corresponding src pixels, performing any colortype/alphatype transformations needed |
| * (in the case where the src and dst have different colortypes or alphatypes). |
| * |
| * This call can fail, returning false, for several reasons: |
| * - If srcR does not intersect the base-layer bounds. |
| * - If the requested colortype/alphatype cannot be converted from the base-layer's types. |
| * - If this canvas is not backed by pixels (e.g. picture or PDF) |
| */ |
| bool readPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes, |
| int srcX, int srcY); |
| |
| /** |
| * Helper for calling readPixels(info, ...). This call will check if bitmap has been allocated. |
| * If not, it will attempt to call allocPixels(). If this fails, it will return false. If not, |
| * it calls through to readPixels(info, ...) and returns its result. |
| */ |
| bool readPixels(SkBitmap* bitmap, int srcX, int srcY); |
| |
| /** |
| * Helper for allocating pixels and then calling readPixels(info, ...). The bitmap is resized |
| * to the intersection of srcRect and the base-layer bounds. On success, pixels will be |
| * allocated in bitmap and true returned. On failure, false is returned and bitmap will be |
| * set to empty. |
| */ |
| bool readPixels(const SkIRect& srcRect, SkBitmap* bitmap); |
| |
| /** |
| * This method affects the pixels in the base-layer, and operates in pixel coordinates, |
| * ignoring the matrix and clip. |
| * |
| * The specified ImageInfo and (x,y) offset specifies a rectangle: target. |
| * |
| * target.setXYWH(x, y, info.width(), info.height()); |
| * |
| * Target is intersected with the bounds of the base-layer. If this intersection is not empty, |
| * then we have two sets of pixels (of equal size), the "src" specified by info+pixels+rowBytes |
| * and the "dst" by the canvas' backend. Replace the dst pixels with the corresponding src |
| * pixels, performing any colortype/alphatype transformations needed (in the case where the |
| * src and dst have different colortypes or alphatypes). |
| * |
| * This call can fail, returning false, for several reasons: |
| * - If the src colortype/alphatype cannot be converted to the canvas' types |
| * - If this canvas is not backed by pixels (e.g. picture or PDF) |
| */ |
| bool writePixels(const SkImageInfo&, const void* pixels, size_t rowBytes, int x, int y); |
| |
| /** |
| * Helper for calling writePixels(info, ...) by passing its pixels and rowbytes. If the bitmap |
| * is just wrapping a texture, returns false and does nothing. |
| */ |
| bool writePixels(const SkBitmap& bitmap, int x, int y); |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| enum SaveFlags { |
| /** save the matrix state, restoring it on restore() */ |
| // [deprecated] kMatrix_SaveFlag = 0x01, |
| kMatrix_SaveFlag = 0x01, |
| /** save the clip state, restoring it on restore() */ |
| // [deprecated] kClip_SaveFlag = 0x02, |
| kClip_SaveFlag = 0x02, |
| /** the layer needs to support per-pixel alpha */ |
| kHasAlphaLayer_SaveFlag = 0x04, |
| /** the layer needs to support 8-bits per color component */ |
| kFullColorLayer_SaveFlag = 0x08, |
| /** |
| * the layer should clip against the bounds argument |
| * |
| * if SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG is undefined, this is treated as always on. |
| */ |
| kClipToLayer_SaveFlag = 0x10, |
| |
| // helper masks for common choices |
| // [deprecated] kMatrixClip_SaveFlag = 0x03, |
| kMatrixClip_SaveFlag = 0x03, |
| #ifdef SK_SUPPORT_LEGACY_CLIPTOLAYERFLAG |
| kARGB_NoClipLayer_SaveFlag = 0x0F, |
| #endif |
| kARGB_ClipLayer_SaveFlag = 0x1F |
| }; |
| |
| /** This call saves the current matrix, clip, and drawFilter, and pushes a |
| copy onto a private stack. Subsequent calls to translate, scale, |
| rotate, skew, concat or clipRect, clipPath, and setDrawFilter all |
| operate on this copy. |
| When the balancing call to restore() is made, the previous matrix, clip, |
| and drawFilter are restored. |
| |
| @return The value to pass to restoreToCount() to balance this save() |
| */ |
| int save(); |
| |
| /** This behaves the same as save(), but in addition it allocates an |
| offscreen bitmap. All drawing calls are directed there, and only when |
| the balancing call to restore() is made is that offscreen transfered to |
| the canvas (or the previous layer). |
| @param bounds (may be null) This rect, if non-null, is used as a hint to |
| limit the size of the offscreen, and thus drawing may be |
| clipped to it, though that clipping is not guaranteed to |
| happen. If exact clipping is desired, use clipRect(). |
| @param paint (may be null) This is copied, and is applied to the |
| offscreen when restore() is called |
| @return The value to pass to restoreToCount() to balance this save() |
| */ |
| int saveLayer(const SkRect* bounds, const SkPaint* paint); |
| int saveLayer(const SkRect& bounds, const SkPaint* paint) { |
| return this->saveLayer(&bounds, paint); |
| } |
| |
| /** DEPRECATED - use saveLayer(const SkRect*, const SkPaint*) instead. |
| |
| This behaves the same as saveLayer(const SkRect*, const SkPaint*), |
| but it allows fine-grained control of which state bits to be saved |
| (and subsequently restored). |
| |
| @param bounds (may be null) This rect, if non-null, is used as a hint to |
| limit the size of the offscreen, and thus drawing may be |
| clipped to it, though that clipping is not guaranteed to |
| happen. If exact clipping is desired, use clipRect(). |
| @param paint (may be null) This is copied, and is applied to the |
| offscreen when restore() is called |
| @param flags LayerFlags |
| @return The value to pass to restoreToCount() to balance this save() |
| */ |
| SK_ATTR_EXTERNALLY_DEPRECATED("SaveFlags use is deprecated") |
| int saveLayer(const SkRect* bounds, const SkPaint* paint, SaveFlags flags); |
| |
| /** This behaves the same as save(), but in addition it allocates an |
| offscreen bitmap. All drawing calls are directed there, and only when |
| the balancing call to restore() is made is that offscreen transfered to |
| the canvas (or the previous layer). |
| @param bounds (may be null) This rect, if non-null, is used as a hint to |
| limit the size of the offscreen, and thus drawing may be |
| clipped to it, though that clipping is not guaranteed to |
| happen. If exact clipping is desired, use clipRect(). |
| @param alpha This is applied to the offscreen when restore() is called. |
| @return The value to pass to restoreToCount() to balance this save() |
| */ |
| int saveLayerAlpha(const SkRect* bounds, U8CPU alpha); |
| |
| /** DEPRECATED - use saveLayerAlpha(const SkRect*, U8CPU) instead. |
| |
| This behaves the same as saveLayerAlpha(const SkRect*, U8CPU), |
| but it allows fine-grained control of which state bits to be saved |
| (and subsequently restored). |
| |
| @param bounds (may be null) This rect, if non-null, is used as a hint to |
| limit the size of the offscreen, and thus drawing may be |
| clipped to it, though that clipping is not guaranteed to |
| happen. If exact clipping is desired, use clipRect(). |
| @param alpha This is applied to the offscreen when restore() is called. |
| @param flags LayerFlags |
| @return The value to pass to restoreToCount() to balance this save() |
| */ |
| SK_ATTR_EXTERNALLY_DEPRECATED("SaveFlags use is deprecated") |
| int saveLayerAlpha(const SkRect* bounds, U8CPU alpha, SaveFlags flags); |
| |
| /** This call balances a previous call to save(), and is used to remove all |
| modifications to the matrix/clip/drawFilter state since the last save |
| call. |
| It is an error to call restore() more times than save() was called. |
| */ |
| void restore(); |
| |
| /** Returns the number of matrix/clip states on the SkCanvas' private stack. |
| This will equal # save() calls - # restore() calls + 1. The save count on |
| a new canvas is 1. |
| */ |
| int getSaveCount() const; |
| |
| /** Efficient way to pop any calls to save() that happened after the save |
| count reached saveCount. It is an error for saveCount to be greater than |
| getSaveCount(). To pop all the way back to the initial matrix/clip context |
| pass saveCount == 1. |
| @param saveCount The number of save() levels to restore from |
| */ |
| void restoreToCount(int saveCount); |
| |
| /** Preconcat the current matrix with the specified translation |
| @param dx The distance to translate in X |
| @param dy The distance to translate in Y |
| */ |
| void translate(SkScalar dx, SkScalar dy); |
| |
| /** Preconcat the current matrix with the specified scale. |
| @param sx The amount to scale in X |
| @param sy The amount to scale in Y |
| */ |
| void scale(SkScalar sx, SkScalar sy); |
| |
| /** Preconcat the current matrix with the specified rotation. |
| @param degrees The amount to rotate, in degrees |
| */ |
| void rotate(SkScalar degrees); |
| |
| /** Preconcat the current matrix with the specified skew. |
| @param sx The amount to skew in X |
| @param sy The amount to skew in Y |
| */ |
| void skew(SkScalar sx, SkScalar sy); |
| |
| /** Preconcat the current matrix with the specified matrix. |
| @param matrix The matrix to preconcatenate with the current matrix |
| */ |
| void concat(const SkMatrix& matrix); |
| |
| /** Replace the current matrix with a copy of the specified matrix. |
| @param matrix The matrix that will be copied into the current matrix. |
| */ |
| void setMatrix(const SkMatrix& matrix); |
| |
| /** Helper for setMatrix(identity). Sets the current matrix to identity. |
| */ |
| void resetMatrix(); |
| |
| /** |
| * Modify the current clip with the specified rectangle. |
| * @param rect The rect to combine with the current clip |
| * @param op The region op to apply to the current clip |
| * @param doAntiAlias true if the clip should be antialiased |
| */ |
| void clipRect(const SkRect& rect, |
| SkRegion::Op op = SkRegion::kIntersect_Op, |
| bool doAntiAlias = false); |
| |
| /** |
| * Modify the current clip with the specified SkRRect. |
| * @param rrect The rrect to combine with the current clip |
| * @param op The region op to apply to the current clip |
| * @param doAntiAlias true if the clip should be antialiased |
| */ |
| void clipRRect(const SkRRect& rrect, |
| SkRegion::Op op = SkRegion::kIntersect_Op, |
| bool doAntiAlias = false); |
| |
| /** |
| * Modify the current clip with the specified path. |
| * @param path The path to combine with the current clip |
| * @param op The region op to apply to the current clip |
| * @param doAntiAlias true if the clip should be antialiased |
| */ |
| void clipPath(const SkPath& path, |
| SkRegion::Op op = SkRegion::kIntersect_Op, |
| bool doAntiAlias = false); |
| |
| /** EXPERIMENTAL -- only used for testing |
| Set to false to force clips to be hard, even if doAntiAlias=true is |
| passed to clipRect or clipPath. |
| */ |
| void setAllowSoftClip(bool allow) { |
| fAllowSoftClip = allow; |
| } |
| |
| /** EXPERIMENTAL -- only used for testing |
| Set to simplify clip stack using path ops. |
| */ |
| void setAllowSimplifyClip(bool allow) { |
| fAllowSimplifyClip = allow; |
| } |
| |
| /** Modify the current clip with the specified region. Note that unlike |
| clipRect() and clipPath() which transform their arguments by the current |
| matrix, clipRegion() assumes its argument is already in device |
| coordinates, and so no transformation is performed. |
| @param deviceRgn The region to apply to the current clip |
| @param op The region op to apply to the current clip |
| */ |
| void clipRegion(const SkRegion& deviceRgn, |
| SkRegion::Op op = SkRegion::kIntersect_Op); |
| |
| /** Helper for clipRegion(rgn, kReplace_Op). Sets the current clip to the |
| specified region. This does not intersect or in any other way account |
| for the existing clip region. |
| @param deviceRgn The region to copy into the current clip. |
| */ |
| void setClipRegion(const SkRegion& deviceRgn) { |
| this->clipRegion(deviceRgn, SkRegion::kReplace_Op); |
| } |
| |
| /** Return true if the specified rectangle, after being transformed by the |
| current matrix, would lie completely outside of the current clip. Call |
| this to check if an area you intend to draw into is clipped out (and |
| therefore you can skip making the draw calls). |
| @param rect the rect to compare with the current clip |
| @return true if the rect (transformed by the canvas' matrix) does not |
| intersect with the canvas' clip |
| */ |
| bool quickReject(const SkRect& rect) const; |
| |
| /** Return true if the specified path, after being transformed by the |
| current matrix, would lie completely outside of the current clip. Call |
| this to check if an area you intend to draw into is clipped out (and |
| therefore you can skip making the draw calls). Note, for speed it may |
| return false even if the path itself might not intersect the clip |
| (i.e. the bounds of the path intersects, but the path does not). |
| @param path The path to compare with the current clip |
| @return true if the path (transformed by the canvas' matrix) does not |
| intersect with the canvas' clip |
| */ |
| bool quickReject(const SkPath& path) const; |
| |
| /** Return true if the horizontal band specified by top and bottom is |
| completely clipped out. This is a conservative calculation, meaning |
| that it is possible that if the method returns false, the band may still |
| in fact be clipped out, but the converse is not true. If this method |
| returns true, then the band is guaranteed to be clipped out. |
| @param top The top of the horizontal band to compare with the clip |
| @param bottom The bottom of the horizontal and to compare with the clip |
| @return true if the horizontal band is completely clipped out (i.e. does |
| not intersect the current clip) |
| */ |
| bool quickRejectY(SkScalar top, SkScalar bottom) const { |
| SkASSERT(top <= bottom); |
| |
| #ifndef SK_WILL_NEVER_DRAW_PERSPECTIVE_TEXT |
| // TODO: add a hasPerspective method similar to getLocalClipBounds. This |
| // would cache the SkMatrix::hasPerspective result. Alternatively, have |
| // the MC stack just set a hasPerspective boolean as it is updated. |
| if (this->getTotalMatrix().hasPerspective()) { |
| // TODO: consider implementing some half-plane test between the |
| // two Y planes and the device-bounds (i.e., project the top and |
| // bottom Y planes and then determine if the clip bounds is completely |
| // outside either one). |
| return false; |
| } |
| #endif |
| |
| const SkRect& clipR = this->getLocalClipBounds(); |
| // In the case where the clip is empty and we are provided with a |
| // negative top and positive bottom parameter then this test will return |
| // false even though it will be clipped. We have chosen to exclude that |
| // check as it is rare and would result double the comparisons. |
| return top >= clipR.fBottom || bottom <= clipR.fTop; |
| } |
| |
| /** Return the bounds of the current clip (in local coordinates) in the |
| bounds parameter, and return true if it is non-empty. This can be useful |
| in a way similar to quickReject, in that it tells you that drawing |
| outside of these bounds will be clipped out. |
| */ |
| virtual bool getClipBounds(SkRect* bounds) const; |
| |
| /** Return the bounds of the current clip, in device coordinates; returns |
| true if non-empty. Maybe faster than getting the clip explicitly and |
| then taking its bounds. |
| */ |
| virtual bool getClipDeviceBounds(SkIRect* bounds) const; |
| |
| |
| /** Fill the entire canvas' bitmap (restricted to the current clip) with the |
| specified ARGB color, using the specified mode. |
| @param a the alpha component (0..255) of the color to fill the canvas |
| @param r the red component (0..255) of the color to fill the canvas |
| @param g the green component (0..255) of the color to fill the canvas |
| @param b the blue component (0..255) of the color to fill the canvas |
| @param mode the mode to apply the color in (defaults to SrcOver) |
| */ |
| void drawARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b, |
| SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode); |
| |
| /** Fill the entire canvas' bitmap (restricted to the current clip) with the |
| specified color and mode. |
| @param color the color to draw with |
| @param mode the mode to apply the color in (defaults to SrcOver) |
| */ |
| void drawColor(SkColor color, SkXfermode::Mode mode = SkXfermode::kSrcOver_Mode); |
| |
| /** |
| * Helper method for drawing a color in SRC mode, completely replacing all the pixels |
| * in the current clip with this color. |
| */ |
| void clear(SkColor color) { |
| this->drawColor(color, SkXfermode::kSrc_Mode); |
| } |
| |
| /** |
| * This makes the contents of the canvas undefined. Subsequent calls that |
| * require reading the canvas contents will produce undefined results. Examples |
| * include blending and readPixels. The actual implementation is backend- |
| * dependent and one legal implementation is to do nothing. Like clear(), this |
| * ignores the clip. |
| * |
| * This function should only be called if the caller intends to subsequently |
| * draw to the canvas. The canvas may do real work at discard() time in order |
| * to optimize performance on subsequent draws. Thus, if you call this and then |
| * never draw to the canvas subsequently you may pay a perfomance penalty. |
| */ |
| void discard() { this->onDiscard(); } |
| |
| /** |
| * Fill the entire canvas' bitmap (restricted to the current clip) with the |
| * specified paint. |
| * @param paint The paint used to fill the canvas |
| */ |
| void drawPaint(const SkPaint& paint); |
| |
| enum PointMode { |
| /** drawPoints draws each point separately */ |
| kPoints_PointMode, |
| /** drawPoints draws each pair of points as a line segment */ |
| kLines_PointMode, |
| /** drawPoints draws the array of points as a polygon */ |
| kPolygon_PointMode |
| }; |
| |
| /** Draw a series of points, interpreted based on the PointMode mode. For |
| all modes, the count parameter is interpreted as the total number of |
| points. For kLine mode, count/2 line segments are drawn. |
| For kPoint mode, each point is drawn centered at its coordinate, and its |
| size is specified by the paint's stroke-width. It draws as a square, |
| unless the paint's cap-type is round, in which the points are drawn as |
| circles. |
| For kLine mode, each pair of points is drawn as a line segment, |
| respecting the paint's settings for cap/join/width. |
| For kPolygon mode, the entire array is drawn as a series of connected |
| line segments. |
| Note that, while similar, kLine and kPolygon modes draw slightly |
| differently than the equivalent path built with a series of moveto, |
| lineto calls, in that the path will draw all of its contours at once, |
| with no interactions if contours intersect each other (think XOR |
| xfermode). drawPoints always draws each element one at a time. |
| @param mode PointMode specifying how to draw the array of points. |
| @param count The number of points in the array |
| @param pts Array of points to draw |
| @param paint The paint used to draw the points |
| */ |
| void drawPoints(PointMode mode, size_t count, const SkPoint pts[], const SkPaint& paint); |
| |
| /** Helper method for drawing a single point. See drawPoints() for a more |
| details. |
| */ |
| void drawPoint(SkScalar x, SkScalar y, const SkPaint& paint); |
| |
| /** Draws a single pixel in the specified color. |
| @param x The X coordinate of which pixel to draw |
| @param y The Y coordiante of which pixel to draw |
| @param color The color to draw |
| */ |
| void drawPoint(SkScalar x, SkScalar y, SkColor color); |
| |
| /** Draw a line segment with the specified start and stop x,y coordinates, |
| using the specified paint. NOTE: since a line is always "framed", the |
| paint's Style is ignored. |
| @param x0 The x-coordinate of the start point of the line |
| @param y0 The y-coordinate of the start point of the line |
| @param x1 The x-coordinate of the end point of the line |
| @param y1 The y-coordinate of the end point of the line |
| @param paint The paint used to draw the line |
| */ |
| void drawLine(SkScalar x0, SkScalar y0, SkScalar x1, SkScalar y1, |
| const SkPaint& paint); |
| |
| /** Draw the specified rectangle using the specified paint. The rectangle |
| will be filled or stroked based on the Style in the paint. |
| @param rect The rect to be drawn |
| @param paint The paint used to draw the rect |
| */ |
| void drawRect(const SkRect& rect, const SkPaint& paint); |
| |
| /** Draw the specified rectangle using the specified paint. The rectangle |
| will be filled or framed based on the Style in the paint. |
| @param rect The rect to be drawn |
| @param paint The paint used to draw the rect |
| */ |
| void drawIRect(const SkIRect& rect, const SkPaint& paint) { |
| SkRect r; |
| r.set(rect); // promotes the ints to scalars |
| this->drawRect(r, paint); |
| } |
| |
| /** Draw the specified rectangle using the specified paint. The rectangle |
| will be filled or framed based on the Style in the paint. |
| @param left The left side of the rectangle to be drawn |
| @param top The top side of the rectangle to be drawn |
| @param right The right side of the rectangle to be drawn |
| @param bottom The bottom side of the rectangle to be drawn |
| @param paint The paint used to draw the rect |
| */ |
| void drawRectCoords(SkScalar left, SkScalar top, SkScalar right, |
| SkScalar bottom, const SkPaint& paint); |
| |
| /** Draw the specified oval using the specified paint. The oval will be |
| filled or framed based on the Style in the paint. |
| @param oval The rectangle bounds of the oval to be drawn |
| @param paint The paint used to draw the oval |
| */ |
| void drawOval(const SkRect& oval, const SkPaint&); |
| |
| /** |
| * Draw the specified RRect using the specified paint The rrect will be filled or stroked |
| * based on the Style in the paint. |
| * |
| * @param rrect The round-rect to draw |
| * @param paint The paint used to draw the round-rect |
| */ |
| void drawRRect(const SkRRect& rrect, const SkPaint& paint); |
| |
| /** |
| * Draw the annulus formed by the outer and inner rrects. The results |
| * are undefined if the outer does not contain the inner. |
| */ |
| void drawDRRect(const SkRRect& outer, const SkRRect& inner, const SkPaint&); |
| |
| /** Draw the specified circle using the specified paint. If radius is <= 0, |
| then nothing will be drawn. The circle will be filled |
| or framed based on the Style in the paint. |
| @param cx The x-coordinate of the center of the cirle to be drawn |
| @param cy The y-coordinate of the center of the cirle to be drawn |
| @param radius The radius of the cirle to be drawn |
| @param paint The paint used to draw the circle |
| */ |
| void drawCircle(SkScalar cx, SkScalar cy, SkScalar radius, |
| const SkPaint& paint); |
| |
| /** Draw the specified arc, which will be scaled to fit inside the |
| specified oval. If the sweep angle is >= 360, then the oval is drawn |
| completely. Note that this differs slightly from SkPath::arcTo, which |
| treats the sweep angle mod 360. |
| @param oval The bounds of oval used to define the shape of the arc |
| @param startAngle Starting angle (in degrees) where the arc begins |
| @param sweepAngle Sweep angle (in degrees) measured clockwise |
| @param useCenter true means include the center of the oval. For filling |
| this will draw a wedge. False means just use the arc. |
| @param paint The paint used to draw the arc |
| */ |
| void drawArc(const SkRect& oval, SkScalar startAngle, SkScalar sweepAngle, |
| bool useCenter, const SkPaint& paint); |
| |
| /** Draw the specified round-rect using the specified paint. The round-rect |
| will be filled or framed based on the Style in the paint. |
| @param rect The rectangular bounds of the roundRect to be drawn |
| @param rx The x-radius of the oval used to round the corners |
| @param ry The y-radius of the oval used to round the corners |
| @param paint The paint used to draw the roundRect |
| */ |
| void drawRoundRect(const SkRect& rect, SkScalar rx, SkScalar ry, |
| const SkPaint& paint); |
| |
| /** Draw the specified path using the specified paint. The path will be |
| filled or framed based on the Style in the paint. |
| @param path The path to be drawn |
| @param paint The paint used to draw the path |
| */ |
| void drawPath(const SkPath& path, const SkPaint& paint); |
| |
| /** Draw the specified image, with its top/left corner at (x,y), using the |
| specified paint, transformed by the current matrix. |
| |
| @param image The image to be drawn |
| @param left The position of the left side of the image being drawn |
| @param top The position of the top side of the image being drawn |
| @param paint The paint used to draw the image, or NULL |
| */ |
| void drawImage(const SkImage* image, SkScalar left, SkScalar top, const SkPaint* paint = NULL); |
| |
| /** |
| * Controls the behavior at the edge of the src-rect, when specified in drawImageRect, |
| * trading off speed for exactness. |
| * |
| * When filtering is enabled (in the Paint), skia may need to sample in a neighborhood around |
| * the pixels in the image. If there is a src-rect specified, it is intended to restrict the |
| * pixels that will be read. However, for performance reasons, some implementations may slow |
| * down if they cannot read 1-pixel past the src-rect boundary at times. |
| * |
| * This enum allows the caller to specify if such a 1-pixel "slop" will be visually acceptable. |
| * If it is, the caller should pass kFast, and it may result in a faster draw. If the src-rect |
| * must be strictly respected, the caller should pass kStrict. |
| */ |
| enum SrcRectConstraint { |
| /** |
| * If kStrict is specified, the implementation must respect the src-rect |
| * (if specified) strictly, and will never sample outside of those bounds during sampling |
| * even when filtering. This may be slower than kFast. |
| */ |
| kStrict_SrcRectConstraint, |
| |
| /** |
| * If kFast is specified, the implementation may sample outside of the src-rect |
| * (if specified) by at most 1 pixel when filtering. This allows greater flexibility |
| * to the implementation and can make the draw much faster. |
| */ |
| kFast_SrcRectConstraint, |
| }; |
| |
| /** Draw the specified image, scaling and translating so that it fills the specified |
| * dst rect. If the src rect is non-null, only that subset of the image is transformed |
| * and drawn. |
| * |
| * @param image The image to be drawn |
| * @param src Optional: specify the subset of the image to be drawn |
| * @param dst The destination rectangle where the scaled/translated |
| * image will be drawn |
| * @param paint The paint used to draw the image, or NULL |
| * @param constraint Control the tradeoff between speed and exactness w.r.t. the src-rect. |
| */ |
| void drawImageRect(const SkImage* image, const SkRect& src, const SkRect& dst, |
| const SkPaint* paint, |
| SrcRectConstraint constraint = kStrict_SrcRectConstraint); |
| // variant that takes src SkIRect |
| void drawImageRect(const SkImage* image, const SkIRect& isrc, const SkRect& dst, |
| const SkPaint* paint, SrcRectConstraint = kStrict_SrcRectConstraint); |
| // variant that assumes src == image-bounds |
| void drawImageRect(const SkImage* image, const SkRect& dst, const SkPaint* paint, |
| SrcRectConstraint = kStrict_SrcRectConstraint); |
| |
| /** |
| * Draw the image stretched differentially to fit into dst. |
| * center is a rect within the image, and logically divides the image |
| * into 9 sections (3x3). For example, if the middle pixel of a [5x5] |
| * image is the "center", then the center-rect should be [2, 2, 3, 3]. |
| * |
| * If the dst is >= the image size, then... |
| * - The 4 corners are not stretched at all. |
| * - The sides are stretched in only one axis. |
| * - The center is stretched in both axes. |
| * Else, for each axis where dst < image, |
| * - The corners shrink proportionally |
| * - The sides (along the shrink axis) and center are not drawn |
| */ |
| void drawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst, |
| const SkPaint* paint = NULL); |
| |
| /** Draw the specified bitmap, with its top/left corner at (x,y), using the |
| specified paint, transformed by the current matrix. Note: if the paint |
| contains a maskfilter that generates a mask which extends beyond the |
| bitmap's original width/height, then the bitmap will be drawn as if it |
| were in a Shader with CLAMP mode. Thus the color outside of the original |
| width/height will be the edge color replicated. |
| |
| If a shader is present on the paint it will be ignored, except in the |
| case where the bitmap is kAlpha_8_SkColorType. In that case, the color is |
| generated by the shader. |
| |
| @param bitmap The bitmap to be drawn |
| @param left The position of the left side of the bitmap being drawn |
| @param top The position of the top side of the bitmap being drawn |
| @param paint The paint used to draw the bitmap, or NULL |
| */ |
| void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top, |
| const SkPaint* paint = NULL); |
| |
| /** Draw the specified bitmap, scaling and translating so that it fills the specified |
| * dst rect. If the src rect is non-null, only that subset of the bitmap is transformed |
| * and drawn. |
| * |
| * @param bitmap The bitmap to be drawn |
| * @param src Optional: specify the subset of the bitmap to be drawn |
| * @param dst The destination rectangle where the scaled/translated |
| * bitmap will be drawn |
| * @param paint The paint used to draw the bitmap, or NULL |
| * @param constraint Control the tradeoff between speed and exactness w.r.t. the src-rect. |
| */ |
| void drawBitmapRect(const SkBitmap& bitmap, const SkRect& src, const SkRect& dst, |
| const SkPaint* paint, SrcRectConstraint = kStrict_SrcRectConstraint); |
| // variant where src is SkIRect |
| void drawBitmapRect(const SkBitmap& bitmap, const SkIRect& isrc, const SkRect& dst, |
| const SkPaint* paint, SrcRectConstraint = kStrict_SrcRectConstraint); |
| void drawBitmapRect(const SkBitmap& bitmap, const SkRect& dst, const SkPaint* paint, |
| SrcRectConstraint = kStrict_SrcRectConstraint); |
| |
| /** |
| * Draw the bitmap stretched differentially to fit into dst. |
| * center is a rect within the bitmap, and logically divides the bitmap |
| * into 9 sections (3x3). For example, if the middle pixel of a [5x5] |
| * bitmap is the "center", then the center-rect should be [2, 2, 3, 3]. |
| * |
| * If the dst is >= the bitmap size, then... |
| * - The 4 corners are not stretched at all. |
| * - The sides are stretched in only one axis. |
| * - The center is stretched in both axes. |
| * Else, for each axis where dst < bitmap, |
| * - The corners shrink proportionally |
| * - The sides (along the shrink axis) and center are not drawn |
| */ |
| void drawBitmapNine(const SkBitmap& bitmap, const SkIRect& center, const SkRect& dst, |
| const SkPaint* paint = NULL); |
| |
| /** Draw the specified bitmap, with its top/left corner at (x,y), |
| NOT transformed by the current matrix. Note: if the paint |
| contains a maskfilter that generates a mask which extends beyond the |
| bitmap's original width/height, then the bitmap will be drawn as if it |
| were in a Shader with CLAMP mode. Thus the color outside of the original |
| width/height will be the edge color replicated. |
| @param bitmap The bitmap to be drawn |
| @param left The position of the left side of the bitmap being drawn |
| @param top The position of the top side of the bitmap being drawn |
| @param paint The paint used to draw the bitmap, or NULL |
| */ |
| void drawSprite(const SkBitmap& bitmap, int left, int top, const SkPaint* paint = NULL); |
| |
| /** Draw the text, with origin at (x,y), using the specified paint. |
| The origin is interpreted based on the Align setting in the paint. |
| @param text The text to be drawn |
| @param byteLength The number of bytes to read from the text parameter |
| @param x The x-coordinate of the origin of the text being drawn |
| @param y The y-coordinate of the origin of the text being drawn |
| @param paint The paint used for the text (e.g. color, size, style) |
| */ |
| void drawText(const void* text, size_t byteLength, SkScalar x, SkScalar y, |
| const SkPaint& paint); |
| |
| /** Draw the text, with each character/glyph origin specified by the pos[] |
| array. The origin is interpreted by the Align setting in the paint. |
| @param text The text to be drawn |
| @param byteLength The number of bytes to read from the text parameter |
| @param pos Array of positions, used to position each character |
| @param paint The paint used for the text (e.g. color, size, style) |
| */ |
| void drawPosText(const void* text, size_t byteLength, const SkPoint pos[], |
| const SkPaint& paint); |
| |
| /** Draw the text, with each character/glyph origin specified by the x |
| coordinate taken from the xpos[] array, and the y from the constY param. |
| The origin is interpreted by the Align setting in the paint. |
| @param text The text to be drawn |
| @param byteLength The number of bytes to read from the text parameter |
| @param xpos Array of x-positions, used to position each character |
| @param constY The shared Y coordinate for all of the positions |
| @param paint The paint used for the text (e.g. color, size, style) |
| */ |
| void drawPosTextH(const void* text, size_t byteLength, const SkScalar xpos[], SkScalar constY, |
| const SkPaint& paint); |
| |
| /** Draw the text, with origin at (x,y), using the specified paint, along |
| the specified path. The paint's Align setting determins where along the |
| path to start the text. |
| @param text The text to be drawn |
| @param byteLength The number of bytes to read from the text parameter |
| @param path The path the text should follow for its baseline |
| @param hOffset The distance along the path to add to the text's |
| starting position |
| @param vOffset The distance above(-) or below(+) the path to |
| position the text |
| @param paint The paint used for the text |
| */ |
| void drawTextOnPathHV(const void* text, size_t byteLength, const SkPath& path, SkScalar hOffset, |
| SkScalar vOffset, const SkPaint& paint); |
| |
| /** Draw the text, with origin at (x,y), using the specified paint, along |
| the specified path. The paint's Align setting determins where along the |
| path to start the text. |
| @param text The text to be drawn |
| @param byteLength The number of bytes to read from the text parameter |
| @param path The path the text should follow for its baseline |
| @param matrix (may be null) Applied to the text before it is |
| mapped onto the path |
| @param paint The paint used for the text |
| */ |
| void drawTextOnPath(const void* text, size_t byteLength, const SkPath& path, |
| const SkMatrix* matrix, const SkPaint& paint); |
| |
| /** Draw the text blob, offset by (x,y), using the specified paint. |
| @param blob The text blob to be drawn |
| @param x The x-offset of the text being drawn |
| @param y The y-offset of the text being drawn |
| @param paint The paint used for the text (e.g. color, size, style) |
| */ |
| void drawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, const SkPaint& paint); |
| |
| /** Draw the picture into this canvas. This method effective brackets the |
| playback of the picture's draw calls with save/restore, so the state |
| of this canvas will be unchanged after this call. |
| @param picture The recorded drawing commands to playback into this |
| canvas. |
| */ |
| void drawPicture(const SkPicture* picture) { |
| this->drawPicture(picture, NULL, NULL); |
| } |
| |
| /** |
| * Draw the picture into this canvas. |
| * |
| * If matrix is non-null, apply that matrix to the CTM when drawing this picture. This is |
| * logically equivalent to |
| * save/concat/drawPicture/restore |
| * |
| * If paint is non-null, draw the picture into a temporary buffer, and then apply the paint's |
| * alpha/colorfilter/imagefilter/xfermode to that buffer as it is drawn to the canvas. |
| * This is logically equivalent to |
| * saveLayer(paint)/drawPicture/restore |
| */ |
| void drawPicture(const SkPicture*, const SkMatrix* matrix, const SkPaint* paint); |
| |
| enum VertexMode { |
| kTriangles_VertexMode, |
| kTriangleStrip_VertexMode, |
| kTriangleFan_VertexMode |
| }; |
| |
| /** Draw the array of vertices, interpreted as triangles (based on mode). |
| |
| If both textures and vertex-colors are NULL, it strokes hairlines with |
| the paint's color. This behavior is a useful debugging mode to visualize |
| the mesh. |
| |
| @param vmode How to interpret the array of vertices |
| @param vertexCount The number of points in the vertices array (and |
| corresponding texs and colors arrays if non-null) |
| @param vertices Array of vertices for the mesh |
| @param texs May be null. If not null, specifies the coordinate |
| in _texture_ space (not uv space) for each vertex. |
| @param colors May be null. If not null, specifies a color for each |
| vertex, to be interpolated across the triangle. |
| @param xmode Used if both texs and colors are present. In this |
| case the colors are combined with the texture using mode, |
| before being drawn using the paint. If mode is null, then |
| kModulate_Mode is used. |
| @param indices If not null, array of indices to reference into the |
| vertex (texs, colors) array. |
| @param indexCount number of entries in the indices array (if not null) |
| @param paint Specifies the shader/texture if present. |
| */ |
| void drawVertices(VertexMode vmode, int vertexCount, |
| const SkPoint vertices[], const SkPoint texs[], |
| const SkColor colors[], SkXfermode* xmode, |
| const uint16_t indices[], int indexCount, |
| const SkPaint& paint); |
| |
| /** |
| Draw a cubic coons patch |
| |
| @param cubic specifies the 4 bounding cubic bezier curves of a patch with clockwise order |
| starting at the top left corner. |
| @param colors specifies the colors for the corners which will be bilerp across the patch, |
| their order is clockwise starting at the top left corner. |
| @param texCoords specifies the texture coordinates that will be bilerp across the patch, |
| their order is the same as the colors. |
| @param xmode specifies how are the colors and the textures combined if both of them are |
| present. |
| @param paint Specifies the shader/texture if present. |
| */ |
| void drawPatch(const SkPoint cubics[12], const SkColor colors[4], |
| const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint); |
| |
| /** |
| * Draw a set of sprites from the atlas. Each is specified by a tex rectangle in the |
| * coordinate space of the atlas, and a corresponding xform which transforms the tex rectangle |
| * into a quad. |
| * |
| * xform maps [0, 0, tex.width, tex.height] -> quad |
| * |
| * The color array is optional. When specified, each color modulates the pixels in its |
| * corresponding quad (via the specified SkXfermode::Mode). |
| * |
| * The cullRect is optional. When specified, it must be a conservative bounds of all of the |
| * resulting transformed quads, allowing the canvas to skip drawing if the cullRect does not |
| * intersect the current clip. |
| * |
| * The paint is optional. If specified, its antialiasing, alpha, color-filter, image-filter |
| * and xfermode are used to affect each of the quads. |
| */ |
| void drawAtlas(const SkImage* atlas, const SkRSXform xform[], const SkRect tex[], |
| const SkColor colors[], int count, SkXfermode::Mode, const SkRect* cullRect, |
| const SkPaint* paint); |
| |
| void drawAtlas(const SkImage* atlas, const SkRSXform xform[], const SkRect tex[], int count, |
| const SkRect* cullRect, const SkPaint* paint) { |
| this->drawAtlas(atlas, xform, tex, NULL, count, SkXfermode::kDst_Mode, cullRect, paint); |
| } |
| |
| /** |
| * Draw the contents of this drawable into the canvas. If the canvas is async |
| * (e.g. it is recording into a picture) then the drawable will be referenced instead, |
| * to have its draw() method called when the picture is finalized. |
| * |
| * If the intent is to force the contents of the drawable into this canvas immediately, |
| * then drawable->draw(canvas) may be called. |
| */ |
| void drawDrawable(SkDrawable* drawable, const SkMatrix* = NULL); |
| void drawDrawable(SkDrawable*, SkScalar x, SkScalar y); |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| /** Get the current filter object. The filter's reference count is not |
| affected. The filter is saved/restored, just like the matrix and clip. |
| @return the canvas' filter (or NULL). |
| */ |
| SkDrawFilter* getDrawFilter() const; |
| |
| /** Set the new filter (or NULL). Pass NULL to clear any existing filter. |
| As a convenience, the parameter is returned. If an existing filter |
| exists, its refcnt is decrement. If the new filter is not null, its |
| refcnt is incremented. The filter is saved/restored, just like the |
| matrix and clip. |
| @param filter the new filter (or NULL) |
| @return the new filter |
| */ |
| virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter); |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| /** |
| * Return true if the current clip is empty (i.e. nothing will draw). |
| * Note: this is not always a free call, so it should not be used |
| * more often than necessary. However, once the canvas has computed this |
| * result, subsequent calls will be cheap (until the clip state changes, |
| * which can happen on any clip..() or restore() call. |
| */ |
| virtual bool isClipEmpty() const; |
| |
| /** |
| * Returns true if the current clip is just a (non-empty) rectangle. |
| * Returns false if the clip is empty, or if it is complex. |
| */ |
| virtual bool isClipRect() const; |
| |
| /** Return the current matrix on the canvas. |
| This does not account for the translate in any of the devices. |
| @return The current matrix on the canvas. |
| */ |
| const SkMatrix& getTotalMatrix() const; |
| |
| /** Return the clip stack. The clip stack stores all the individual |
| * clips organized by the save/restore frame in which they were |
| * added. |
| * @return the current clip stack ("list" of individual clip elements) |
| */ |
| const SkClipStack* getClipStack() const { |
| return fClipStack; |
| } |
| |
| typedef SkCanvasClipVisitor ClipVisitor; |
| /** |
| * Replays the clip operations, back to front, that have been applied to |
| * the canvas, calling the appropriate method on the visitor for each |
| * clip. All clips have already been transformed into device space. |
| */ |
| void replayClips(ClipVisitor*) const; |
| |
| /////////////////////////////////////////////////////////////////////////// |
| |
| /** After calling saveLayer(), there can be any number of devices that make |
| up the top-most drawing area. LayerIter can be used to iterate through |
| those devices. Note that the iterator is only valid until the next API |
| call made on the canvas. Ownership of all pointers in the iterator stays |
| with the canvas, so none of them should be modified or deleted. |
| */ |
| class SK_API LayerIter /*: SkNoncopyable*/ { |
| public: |
| /** Initialize iterator with canvas, and set values for 1st device */ |
| LayerIter(SkCanvas*, bool skipEmptyClips); |
| ~LayerIter(); |
| |
| /** Return true if the iterator is done */ |
| bool done() const { return fDone; } |
| /** Cycle to the next device */ |
| void next(); |
| |
| // These reflect the current device in the iterator |
| |
| SkBaseDevice* device() const; |
| const SkMatrix& matrix() const; |
| const SkRegion& clip() const; |
| const SkPaint& paint() const; |
| int x() const; |
| int y() const; |
| |
| private: |
| // used to embed the SkDrawIter object directly in our instance, w/o |
| // having to expose that class def to the public. There is an assert |
| // in our constructor to ensure that fStorage is large enough |
| // (though needs to be a compile-time-assert!). We use intptr_t to work |
| // safely with 32 and 64 bit machines (to ensure the storage is enough) |
| intptr_t fStorage[32]; |
| class SkDrawIter* fImpl; // this points at fStorage |
| SkPaint fDefaultPaint; |
| bool fDone; |
| }; |
| |
| // don't call |
| GrRenderTarget* internal_private_accessTopLayerRenderTarget(); |
| |
| // don't call |
| static void Internal_Private_SetIgnoreSaveLayerBounds(bool); |
| static bool Internal_Private_GetIgnoreSaveLayerBounds(); |
| static void Internal_Private_SetTreatSpriteAsBitmap(bool); |
| static bool Internal_Private_GetTreatSpriteAsBitmap(); |
| |
| // TEMP helpers until we switch virtual over to const& for src-rect |
| void legacy_drawImageRect(const SkImage* image, const SkRect* src, const SkRect& dst, |
| const SkPaint* paint, |
| SrcRectConstraint constraint = kStrict_SrcRectConstraint); |
| void legacy_drawBitmapRect(const SkBitmap& bitmap, const SkRect* src, const SkRect& dst, |
| const SkPaint* paint, |
| SrcRectConstraint constraint = kStrict_SrcRectConstraint); |
| |
| protected: |
| // default impl defers to getDevice()->newSurface(info) |
| virtual SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&); |
| |
| // default impl defers to its device |
| virtual bool onPeekPixels(SkPixmap*); |
| virtual bool onAccessTopLayerPixels(SkPixmap*); |
| |
| // Subclass save/restore notifiers. |
| // Overriders should call the corresponding INHERITED method up the inheritance chain. |
| // willSaveLayer()'s return value may suppress full layer allocation. |
| enum SaveLayerStrategy { |
| kFullLayer_SaveLayerStrategy, |
| kNoLayer_SaveLayerStrategy |
| }; |
| |
| virtual void willSave() {} |
| virtual SaveLayerStrategy willSaveLayer(const SkRect*, const SkPaint*, SaveFlags) { |
| return kFullLayer_SaveLayerStrategy; |
| } |
| virtual void willRestore() {} |
| virtual void didRestore() {} |
| virtual void didConcat(const SkMatrix&) {} |
| virtual void didSetMatrix(const SkMatrix&) {} |
| |
| virtual void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&); |
| |
| virtual void onDrawText(const void* text, size_t byteLength, SkScalar x, |
| SkScalar y, const SkPaint& paint); |
| |
| virtual void onDrawPosText(const void* text, size_t byteLength, |
| const SkPoint pos[], const SkPaint& paint); |
| |
| virtual void onDrawPosTextH(const void* text, size_t byteLength, |
| const SkScalar xpos[], SkScalar constY, |
| const SkPaint& paint); |
| |
| virtual void onDrawTextOnPath(const void* text, size_t byteLength, |
| const SkPath& path, const SkMatrix* matrix, |
| const SkPaint& paint); |
| |
| virtual void onDrawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y, |
| const SkPaint& paint); |
| |
| virtual void onDrawPatch(const SkPoint cubics[12], const SkColor colors[4], |
| const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint); |
| |
| virtual void onDrawDrawable(SkDrawable*, const SkMatrix*); |
| |
| virtual void onDrawPaint(const SkPaint&); |
| virtual void onDrawRect(const SkRect&, const SkPaint&); |
| virtual void onDrawOval(const SkRect&, const SkPaint&); |
| virtual void onDrawRRect(const SkRRect&, const SkPaint&); |
| virtual void onDrawPoints(PointMode, size_t count, const SkPoint pts[], const SkPaint&); |
| virtual void onDrawVertices(VertexMode, int vertexCount, const SkPoint vertices[], |
| const SkPoint texs[], const SkColor colors[], SkXfermode*, |
| const uint16_t indices[], int indexCount, const SkPaint&); |
| |
| virtual void onDrawAtlas(const SkImage*, const SkRSXform[], const SkRect[], const SkColor[], |
| int count, SkXfermode::Mode, const SkRect* cull, const SkPaint*); |
| virtual void onDrawPath(const SkPath&, const SkPaint&); |
| virtual void onDrawImage(const SkImage*, SkScalar dx, SkScalar dy, const SkPaint*); |
| virtual void onDrawImageRect(const SkImage*, const SkRect*, const SkRect&, const SkPaint*, |
| SrcRectConstraint); |
| virtual void onDrawImageNine(const SkImage*, const SkIRect& center, const SkRect& dst, |
| const SkPaint*); |
| |
| virtual void onDrawBitmap(const SkBitmap&, SkScalar dx, SkScalar dy, const SkPaint*); |
| virtual void onDrawBitmapRect(const SkBitmap&, const SkRect*, const SkRect&, const SkPaint*, |
| SrcRectConstraint); |
| virtual void onDrawBitmapNine(const SkBitmap&, const SkIRect& center, const SkRect& dst, |
| const SkPaint*); |
| virtual void onDrawSprite(const SkBitmap&, int left, int top, const SkPaint*); |
| |
| enum ClipEdgeStyle { |
| kHard_ClipEdgeStyle, |
| kSoft_ClipEdgeStyle |
| }; |
| |
| virtual void onClipRect(const SkRect& rect, SkRegion::Op op, ClipEdgeStyle edgeStyle); |
| virtual void onClipRRect(const SkRRect& rrect, SkRegion::Op op, ClipEdgeStyle edgeStyle); |
| virtual void onClipPath(const SkPath& path, SkRegion::Op op, ClipEdgeStyle edgeStyle); |
| virtual void onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op); |
| |
| virtual void onDiscard(); |
| |
| virtual void onDrawPicture(const SkPicture*, const SkMatrix*, const SkPaint*); |
| |
| // Returns the canvas to be used by DrawIter. Default implementation |
| // returns this. Subclasses that encapsulate an indirect canvas may |
| // need to overload this method. The impl must keep track of this, as it |
| // is not released or deleted by the caller. |
| virtual SkCanvas* canvasForDrawIter(); |
| |
| // Clip rectangle bounds. Called internally by saveLayer. |
| // returns false if the entire rectangle is entirely clipped out |
| // If non-NULL, The imageFilter parameter will be used to expand the clip |
| // and offscreen bounds for any margin required by the filter DAG. |
| bool clipRectBounds(const SkRect* bounds, SaveFlags flags, |
| SkIRect* intersection, |
| const SkImageFilter* imageFilter = NULL); |
| |
| private: |
| enum ShaderOverrideOpacity { |
| kNone_ShaderOverrideOpacity, //!< there is no overriding shader (bitmap or image) |
| kOpaque_ShaderOverrideOpacity, //!< the overriding shader is opaque |
| kNotOpaque_ShaderOverrideOpacity, //!< the overriding shader may not be opaque |
| }; |
| |
| // notify our surface (if we have one) that we are about to draw, so it |
| // can perform copy-on-write or invalidate any cached images |
| void predrawNotify(bool willOverwritesEntireSurface = false); |
| void predrawNotify(const SkRect* rect, const SkPaint* paint, ShaderOverrideOpacity); |
| void predrawNotify(const SkRect* rect, const SkPaint* paint, bool shaderOverrideIsOpaque) { |
| this->predrawNotify(rect, paint, shaderOverrideIsOpaque ? kOpaque_ShaderOverrideOpacity |
| : kNotOpaque_ShaderOverrideOpacity); |
| } |
| |
| class MCRec; |
| |
| SkAutoTUnref<SkClipStack> fClipStack; |
| SkDeque fMCStack; |
| // points to top of stack |
| MCRec* fMCRec; |
| // the first N recs that can fit here mean we won't call malloc |
| enum { |
| kMCRecSize = 128, // most recent measurement |
| kMCRecCount = 8, // common depth for save/restores |
| kDeviceCMSize = 136, // most recent measurement |
| }; |
| intptr_t fMCRecStorage[kMCRecSize * kMCRecCount / sizeof(intptr_t)]; |
| intptr_t fDeviceCMStorage[kDeviceCMSize / sizeof(intptr_t)]; |
| |
| const SkSurfaceProps fProps; |
| |
| int fSaveCount; // value returned by getSaveCount() |
| |
| SkMetaData* fMetaData; |
| |
| SkSurface_Base* fSurfaceBase; |
| SkSurface_Base* getSurfaceBase() const { return fSurfaceBase; } |
| void setSurfaceBase(SkSurface_Base* sb) { |
| fSurfaceBase = sb; |
| } |
| friend class SkSurface_Base; |
| friend class SkSurface_Gpu; |
| |
| bool fDeviceCMDirty; // cleared by updateDeviceCMCache() |
| void updateDeviceCMCache(); |
| |
| void doSave(); |
| void checkForDeferredSave(); |
| |
| friend class SkDrawIter; // needs setupDrawForLayerDevice() |
| friend class AutoDrawLooper; |
| friend class SkLua; // needs top layer size and offset |
| friend class SkDebugCanvas; // needs experimental fAllowSimplifyClip |
| friend class SkSurface_Raster; // needs getDevice() |
| friend class SkRecorder; // InitFlags |
| friend class SkNoSaveLayerCanvas; // InitFlags |
| friend class SkPictureImageFilter; // SkCanvas(SkBaseDevice*, SkSurfaceProps*, InitFlags) |
| friend class SkPictureRecord; // predrawNotify (why does it need it? <reed>) |
| |
| enum InitFlags { |
| kDefault_InitFlags = 0, |
| kConservativeRasterClip_InitFlag = 1 << 0, |
| }; |
| SkCanvas(const SkIRect& bounds, InitFlags); |
| SkCanvas(SkBaseDevice* device, InitFlags); |
| |
| void resetForNextPicture(const SkIRect& bounds); |
| |
| // needs gettotalclip() |
| friend class SkCanvasStateUtils; |
| |
| // call this each time we attach ourselves to a device |
| // - constructor |
| // - internalSaveLayer |
| void setupDevice(SkBaseDevice*); |
| |
| SkBaseDevice* init(SkBaseDevice*, InitFlags); |
| |
| /** |
| * Gets the size/origin of the top level layer in global canvas coordinates. We don't want this |
| * to be public because it exposes decisions about layer sizes that are internal to the canvas. |
| */ |
| SkISize getTopLayerSize() const; |
| SkIPoint getTopLayerOrigin() const; |
| |
| // internal methods are not virtual, so they can safely be called by other |
| // canvas apis, without confusing subclasses (like SkPictureRecording) |
| void internalDrawBitmap(const SkBitmap&, const SkMatrix& m, const SkPaint* paint); |
| void internalDrawBitmapRect(const SkBitmap& bitmap, const SkRect* src, |
| const SkRect& dst, const SkPaint* paint, |
| SrcRectConstraint); |
| void internalDrawPaint(const SkPaint& paint); |
| void internalSaveLayer(const SkRect* bounds, const SkPaint*, SaveFlags, SaveLayerStrategy); |
| void internalDrawDevice(SkBaseDevice*, int x, int y, const SkPaint*, bool isBitmapDevice); |
| |
| // shared by save() and saveLayer() |
| void internalSave(); |
| void internalRestore(); |
| static void DrawRect(const SkDraw& draw, const SkPaint& paint, |
| const SkRect& r, SkScalar textSize); |
| static void DrawTextDecorations(const SkDraw& draw, const SkPaint& paint, |
| const char text[], size_t byteLength, |
| SkScalar x, SkScalar y); |
| |
| // only for canvasutils |
| const SkRegion& internal_private_getTotalClip() const; |
| |
| /* |
| * Returns true if drawing the specified rect (or all if it is null) with the specified |
| * paint (or default if null) would overwrite the entire root device of the canvas |
| * (i.e. the canvas' surface if it had one). |
| */ |
| bool wouldOverwriteEntireSurface(const SkRect*, const SkPaint*, ShaderOverrideOpacity) const; |
| |
| |
| /* These maintain a cache of the clip bounds in local coordinates, |
| (converted to 2s-compliment if floats are slow). |
| */ |
| mutable SkRect fCachedLocalClipBounds; |
| mutable bool fCachedLocalClipBoundsDirty; |
| bool fAllowSoftClip; |
| bool fAllowSimplifyClip; |
| bool fConservativeRasterClip; |
| |
| const SkRect& getLocalClipBounds() const { |
| if (fCachedLocalClipBoundsDirty) { |
| if (!this->getClipBounds(&fCachedLocalClipBounds)) { |
| fCachedLocalClipBounds.setEmpty(); |
| } |
| fCachedLocalClipBoundsDirty = false; |
| } |
| return fCachedLocalClipBounds; |
| } |
| |
| class AutoValidateClip : ::SkNoncopyable { |
| public: |
| explicit AutoValidateClip(SkCanvas* canvas) : fCanvas(canvas) { |
| fCanvas->validateClip(); |
| } |
| ~AutoValidateClip() { fCanvas->validateClip(); } |
| |
| private: |
| const SkCanvas* fCanvas; |
| }; |
| |
| #ifdef SK_DEBUG |
| void validateClip() const; |
| #else |
| void validateClip() const {} |
| #endif |
| |
| typedef SkRefCnt INHERITED; |
| }; |
| |
| /** Stack helper class to automatically call restoreToCount() on the canvas |
| when this object goes out of scope. Use this to guarantee that the canvas |
| is restored to a known state. |
| */ |
| class SkAutoCanvasRestore : SkNoncopyable { |
| public: |
| SkAutoCanvasRestore(SkCanvas* canvas, bool doSave) : fCanvas(canvas), fSaveCount(0) { |
| if (fCanvas) { |
| fSaveCount = canvas->getSaveCount(); |
| if (doSave) { |
| canvas->save(); |
| } |
| } |
| } |
| ~SkAutoCanvasRestore() { |
| if (fCanvas) { |
| fCanvas->restoreToCount(fSaveCount); |
| } |
| } |
| |
| /** |
| * Perform the restore now, instead of waiting for the destructor. Will |
| * only do this once. |
| */ |
| void restore() { |
| if (fCanvas) { |
| fCanvas->restoreToCount(fSaveCount); |
| fCanvas = NULL; |
| } |
| } |
| |
| private: |
| SkCanvas* fCanvas; |
| int fSaveCount; |
| }; |
| #define SkAutoCanvasRestore(...) SK_REQUIRE_LOCAL_VAR(SkAutoCanvasRestore) |
| |
| /** |
| * If the caller wants read-only access to the pixels in a canvas, it can just |
| * call canvas->peekPixels(), since that is the fastest way to "peek" at the |
| * pixels on a raster-backed canvas. |
| * |
| * If the canvas has pixels, but they are not readily available to the CPU |
| * (e.g. gpu-backed), then peekPixels() will fail, but readPixels() will |
| * succeed (though be slower, since it will return a copy of the pixels). |
| * |
| * SkAutoROCanvasPixels encapsulates these two techniques, trying first to call |
| * peekPixels() (for performance), but if that fails, calling readPixels() and |
| * storing the copy locally. |
| * |
| * The caller must respect the restrictions associated with peekPixels(), since |
| * that may have been called: The returned information is invalidated if... |
| * - any API is called on the canvas (or its parent surface if present) |
| * - the canvas goes out of scope |
| */ |
| class SkAutoROCanvasPixels : SkNoncopyable { |
| public: |
| SkAutoROCanvasPixels(SkCanvas* canvas); |
| |
| // returns NULL on failure |
| const void* addr() const { return fAddr; } |
| |
| // undefined if addr() == NULL |
| size_t rowBytes() const { return fRowBytes; } |
| |
| // undefined if addr() == NULL |
| const SkImageInfo& info() const { return fInfo; } |
| |
| // helper that, if returns true, installs the pixels into the bitmap. Note |
| // that the bitmap may reference the address returned by peekPixels(), so |
| // the caller must respect the restrictions associated with peekPixels(). |
| bool asROBitmap(SkBitmap*) const; |
| |
| private: |
| SkBitmap fBitmap; // used if peekPixels() fails |
| const void* fAddr; // NULL on failure |
| SkImageInfo fInfo; |
| size_t fRowBytes; |
| }; |
| |
| static inline SkCanvas::SaveFlags operator|(const SkCanvas::SaveFlags lhs, |
| const SkCanvas::SaveFlags rhs) { |
| return static_cast<SkCanvas::SaveFlags>(static_cast<int>(lhs) | static_cast<int>(rhs)); |
| } |
| |
| static inline SkCanvas::SaveFlags& operator|=(SkCanvas::SaveFlags& lhs, |
| const SkCanvas::SaveFlags rhs) { |
| lhs = lhs | rhs; |
| return lhs; |
| } |
| |
| class SkCanvasClipVisitor { |
| public: |
| virtual ~SkCanvasClipVisitor(); |
| virtual void clipRect(const SkRect&, SkRegion::Op, bool antialias) = 0; |
| virtual void clipRRect(const SkRRect&, SkRegion::Op, bool antialias) = 0; |
| virtual void clipPath(const SkPath&, SkRegion::Op, bool antialias) = 0; |
| }; |
| |
| #endif |
