| /* |
| * Copyright (C) 2006 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef SkPaint_DEFINED |
| #define SkPaint_DEFINED |
| |
| #include "SkColor.h" |
| #include "SkMath.h" |
| #include "SkPorterDuff.h" |
| |
| class SkAutoGlyphCache; |
| class SkColorFilter; |
| class SkDescriptor; |
| class SkFlattenableReadBuffer; |
| class SkFlattenableWriteBuffer; |
| struct SkGlyph; |
| struct SkRect; |
| class SkGlyphCache; |
| class SkMaskFilter; |
| class SkMatrix; |
| class SkPath; |
| class SkPathEffect; |
| class SkRasterizer; |
| class SkShader; |
| class SkDrawLooper; |
| class SkTypeface; |
| class SkXfermode; |
| |
| typedef const SkGlyph& (*SkDrawCacheProc)(SkGlyphCache*, const char**, |
| SkFixed x, SkFixed y); |
| |
| typedef const SkGlyph& (*SkMeasureCacheProc)(SkGlyphCache*, const char**); |
| |
| /** \class SkPaint |
| |
| The SkPaint class holds the style and color information about how to draw |
| geometries, text and bitmaps. |
| */ |
| class SkPaint { |
| public: |
| SkPaint(); |
| SkPaint(const SkPaint& paint); |
| ~SkPaint(); |
| |
| SkPaint& operator=(const SkPaint&); |
| |
| friend int operator==(const SkPaint& a, const SkPaint& b); |
| friend int operator!=(const SkPaint& a, const SkPaint& b) |
| { |
| return !(a == b); |
| } |
| |
| void flatten(SkFlattenableWriteBuffer&) const; |
| void unflatten(SkFlattenableReadBuffer&); |
| |
| /** Restores the paint to its initial settings. |
| */ |
| void reset(); |
| |
| /** Specifies the bit values that are stored in the paint's flags. |
| */ |
| enum Flags { |
| kAntiAlias_Flag = 0x01, //!< mask to enable antialiasing |
| kFilterBitmap_Flag = 0x02, //!< mask to enable bitmap filtering |
| kDither_Flag = 0x04, //!< mask to enable dithering |
| kUnderlineText_Flag = 0x08, //!< mask to enable underline text |
| kStrikeThruText_Flag = 0x10, //!< mask to enable strike-thru text |
| kFakeBoldText_Flag = 0x20, //!< mask to enable fake-bold text |
| kLinearText_Flag = 0x40, //!< mask to enable linear-text |
| kSubpixelText_Flag = 0x80, //!< mask to enable subpixel-text |
| kDevKernText_Flag = 0x100, //!< mask to enable device kerning text |
| |
| kAllFlags = 0x1FF |
| }; |
| |
| /** Return the paint's flags. Use the Flag enum to test flag values. |
| @return the paint's flags (see enums ending in _Flag for bit masks) |
| */ |
| uint32_t getFlags() const { return fFlags; } |
| |
| /** Set the paint's flags. Use the Flag enum to specific flag values. |
| @param flags The new flag bits for the paint (see Flags enum) |
| */ |
| void setFlags(uint32_t flags); |
| |
| /** Helper for getFlags(), returning true if kAntiAlias_Flag bit is set |
| @return true if the antialias bit is set in the paint's flags. |
| */ |
| bool isAntiAlias() const |
| { |
| return SkToBool(this->getFlags() & kAntiAlias_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kAntiAlias_Flag bit |
| @param aa true to enable antialiasing, false to disable it |
| */ |
| void setAntiAlias(bool aa); |
| |
| /** Helper for getFlags(), returning true if kDither_Flag bit is set |
| @return true if the dithering bit is set in the paint's flags. |
| */ |
| bool isDither() const |
| { |
| return SkToBool(this->getFlags() & kDither_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kDither_Flag bit |
| @param dither true to enable dithering, false to disable it |
| */ |
| void setDither(bool dither); |
| |
| /** Helper for getFlags(), returning true if kLinearText_Flag bit is set |
| @return true if the lineartext bit is set in the paint's flags |
| */ |
| bool isLinearText() const |
| { |
| return SkToBool(this->getFlags() & kLinearText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kLinearText_Flag bit |
| @param linearText true to set the linearText bit in the paint's flags, |
| false to clear it. |
| */ |
| void setLinearText(bool linearText); |
| |
| /** Helper for getFlags(), returning true if kSubpixelText_Flag bit is set |
| @return true if the lineartext bit is set in the paint's flags |
| */ |
| bool isSubpixelText() const |
| { |
| return SkToBool(this->getFlags() & kSubpixelText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kSubpixelText_Flag bit |
| @param subpixelText true to set the subpixelText bit in the paint's |
| flags, false to clear it. |
| */ |
| void setSubpixelText(bool subpixelText); |
| |
| /** Helper for getFlags(), returning true if kUnderlineText_Flag bit is set |
| @return true if the underlineText bit is set in the paint's flags. |
| */ |
| bool isUnderlineText() const |
| { |
| return SkToBool(this->getFlags() & kUnderlineText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kUnderlineText_Flag bit |
| @param underlineText true to set the underlineText bit in the paint's |
| flags, false to clear it. |
| */ |
| void setUnderlineText(bool underlineText); |
| |
| /** Helper for getFlags(), returns true if kStrikeThruText_Flag bit is set |
| @return true if the strikeThruText bit is set in the paint's flags. |
| */ |
| bool isStrikeThruText() const |
| { |
| return SkToBool(this->getFlags() & kStrikeThruText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kStrikeThruText_Flag bit |
| @param strikeThruText true to set the strikeThruText bit in the |
| paint's flags, false to clear it. |
| */ |
| void setStrikeThruText(bool strikeThruText); |
| |
| /** Helper for getFlags(), returns true if kFakeBoldText_Flag bit is set |
| @return true if the kFakeBoldText_Flag bit is set in the paint's flags. |
| */ |
| bool isFakeBoldText() const |
| { |
| return SkToBool(this->getFlags() & kFakeBoldText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kFakeBoldText_Flag bit |
| @param fakeBoldText true to set the kFakeBoldText_Flag bit in the paint's |
| flags, false to clear it. |
| */ |
| void setFakeBoldText(bool fakeBoldText); |
| |
| /** Helper for getFlags(), returns true if kDevKernText_Flag bit is set |
| @return true if the kernText bit is set in the paint's flags. |
| */ |
| bool isDevKernText() const |
| { |
| return SkToBool(this->getFlags() & kDevKernText_Flag); |
| } |
| |
| /** Helper for setFlags(), setting or clearing the kKernText_Flag bit |
| @param kernText true to set the kKernText_Flag bit in the paint's |
| flags, false to clear it. |
| */ |
| void setDevKernText(bool devKernText); |
| |
| bool isFilterBitmap() const |
| { |
| return SkToBool(this->getFlags() & kFilterBitmap_Flag); |
| } |
| |
| void setFilterBitmap(bool filterBitmap); |
| |
| /** Styles apply to rect, oval, path, and text. |
| Bitmaps are always drawn in "fill", and lines are always drawn in |
| "stroke". |
| */ |
| enum Style { |
| kFill_Style, //!< fill with the paint's color |
| kStroke_Style, //!< stroke with the paint's color |
| kStrokeAndFill_Style, //!< fill and stroke with the paint's color |
| |
| kStyleCount, |
| }; |
| |
| /** Return the paint's style, used for controlling how primitives' |
| geometries are interpreted (except for drawBitmap, which always assumes |
| kFill_Style). |
| @return the paint's Style |
| */ |
| Style getStyle() const { return (Style)fStyle; } |
| |
| /** Set the paint's style, used for controlling how primitives' |
| geometries are interpreted (except for drawBitmap, which always assumes |
| Fill). |
| @param style The new style to set in the paint |
| */ |
| void setStyle(Style style); |
| |
| /** Return the paint's color. Note that the color is a 32bit value |
| containing alpha as well as r,g,b. This 32bit value is not |
| premultiplied, meaning that its alpha can be any value, regardless of |
| the values of r,g,b. |
| @return the paint's color (and alpha). |
| */ |
| SkColor getColor() const { return fColor; } |
| |
| /** Set the paint's color. Note that the color is a 32bit value containing |
| alpha as well as r,g,b. This 32bit value is not premultiplied, meaning |
| that its alpha can be any value, regardless of the values of r,g,b. |
| @param color The new color (including alpha) to set in the paint. |
| */ |
| void setColor(SkColor color); |
| |
| /** Helper to getColor() that just returns the color's alpha value. |
| @return the alpha component of the paint's color. |
| */ |
| uint8_t getAlpha() const { return SkToU8(SkColorGetA(fColor)); } |
| |
| /** Helper to setColor(), that only assigns the color's alpha value, |
| leaving its r,g,b values unchanged. |
| @param a set the alpha component (0..255) of the paint's color. |
| */ |
| void setAlpha(U8CPU a); |
| |
| /** Helper to setColor(), that takes a,r,g,b and constructs the color value |
| using SkColorSetARGB() |
| @param a The new alpha component (0..255) of the paint's color. |
| @param r The new red component (0..255) of the paint's color. |
| @param g The new green component (0..255) of the paint's color. |
| @param b The new blue component (0..255) of the paint's color. |
| */ |
| void setARGB(U8CPU a, U8CPU r, U8CPU g, U8CPU b); |
| |
| /** Return the width for stroking. |
| <p /> |
| A value of 0 strokes in hairline mode. |
| Hairlines always draw 1-pixel wide, regardless of the matrix. |
| @return the paint's stroke width, used whenever the paint's style is |
| Stroke or StrokeAndFill. |
| */ |
| SkScalar getStrokeWidth() const { return fWidth; } |
| |
| /** Set the width for stroking. |
| Pass 0 to stroke in hairline mode. |
| Hairlines always draw 1-pixel wide, regardless of the matrix. |
| @param width set the paint's stroke width, used whenever the paint's |
| style is Stroke or StrokeAndFill. |
| */ |
| void setStrokeWidth(SkScalar width); |
| |
| /** Return the paint's stroke miter value. This is used to control the |
| behavior of miter joins when the joins angle is sharp. |
| @return the paint's miter limit, used whenever the paint's style is |
| Stroke or StrokeAndFill. |
| */ |
| SkScalar getStrokeMiter() const { return fMiterLimit; } |
| |
| /** Set the paint's stroke miter value. This is used to control the |
| behavior of miter joins when the joins angle is sharp. This value must |
| be >= 0. |
| @param miter set the miter limit on the paint, used whenever the |
| paint's style is Stroke or StrokeAndFill. |
| */ |
| void setStrokeMiter(SkScalar miter); |
| |
| /** Cap enum specifies the settings for the paint's strokecap. This is the |
| treatment that is applied to the beginning and end of each non-closed |
| contour (e.g. lines). |
| */ |
| enum Cap { |
| kButt_Cap, //!< begin/end contours with no extension |
| kRound_Cap, //!< begin/end contours with a semi-circle extension |
| kSquare_Cap, //!< begin/end contours with a half square extension |
| |
| kCapCount, |
| kDefault_Cap = kButt_Cap |
| }; |
| |
| /** Join enum specifies the settings for the paint's strokejoin. This is |
| the treatment that is applied to corners in paths and rectangles. |
| */ |
| enum Join { |
| kMiter_Join, //!< connect path segments with a sharp join |
| kRound_Join, //!< connect path segments with a round join |
| kBevel_Join, //!< connect path segments with a flat bevel join |
| |
| kJoinCount, |
| kDefault_Join = kMiter_Join |
| }; |
| |
| /** Return the paint's stroke cap type, controlling how the start and end |
| of stroked lines and paths are treated. |
| @return the line cap style for the paint, used whenever the paint's |
| style is Stroke or StrokeAndFill. |
| */ |
| Cap getStrokeCap() const { return (Cap)fCapType; } |
| |
| /** Set the paint's stroke cap type. |
| @param cap set the paint's line cap style, used whenever the paint's |
| style is Stroke or StrokeAndFill. |
| */ |
| void setStrokeCap(Cap cap); |
| |
| /** Return the paint's stroke join type. |
| @return the paint's line join style, used whenever the paint's style is |
| Stroke or StrokeAndFill. |
| */ |
| Join getStrokeJoin() const { return (Join)fJoinType; } |
| |
| /** Set the paint's stroke join type. |
| @param join set the paint's line join style, used whenever the paint's |
| style is Stroke or StrokeAndFill. |
| */ |
| void setStrokeJoin(Join join); |
| |
| /** Applies any/all effects (patheffect, stroking) to src, returning the |
| result in dst. The result is that drawing src with this paint will be |
| the same as drawing dst with a default paint (at least from the |
| geometric perspective). |
| @param src input path |
| @param dst output path (may be the same as src) |
| @return true if the path should be filled, or false if it should be |
| drawn with a hairline (width == 0) |
| */ |
| bool getFillPath(const SkPath& src, SkPath* dst) const; |
| |
| /** Returns true if the current paint settings allow for fast computation of |
| bounds (i.e. there is nothing complex like a patheffect that would make |
| the bounds computation expensive. |
| */ |
| bool canComputeFastBounds() const; |
| |
| /** Only call this if canComputeFastBounds() returned true. This takes a |
| raw rectangle (the raw bounds of a shape), and adjusts it for stylistic |
| effects in the paint (e.g. stroking). If needed, it uses the storage |
| rect parameter. It returns the adjusted bounds that can then be used |
| for quickReject tests. |
| |
| The returned rect will either be orig or storage, thus the caller |
| should not rely on storage being set to the result, but should always |
| use the retured value. It is legal for orig and storage to be the same |
| rect. |
| |
| e.g. |
| if (paint.canComputeFastBounds()) { |
| SkRect r, storage; |
| path.computeBounds(&r, SkPath::kFast_BoundsType); |
| const SkRect& fastR = paint.computeFastBounds(r, &storage); |
| if (canvas->quickReject(fastR, ...)) { |
| // don't draw the path |
| } |
| } |
| */ |
| const SkRect& computeFastBounds(const SkRect& orig, SkRect* storage) const; |
| |
| /** Get the paint's shader object. |
| <p /> |
| The shader's reference count is not affected. |
| @return the paint's shader (or NULL) |
| */ |
| SkShader* getShader() const { return fShader; } |
| |
| /** Set or clear the shader object. |
| <p /> |
| Pass NULL to clear any previous shader. |
| As a convenience, the parameter passed is also returned. |
| If a previous shader exists, its reference count is decremented. |
| If shader is not NULL, its reference count is incremented. |
| @param shader May be NULL. The shader to be installed in the paint |
| @return shader |
| */ |
| SkShader* setShader(SkShader* shader); |
| |
| /** Get the paint's colorfilter. If there is a colorfilter, its reference |
| count is not changed. |
| @return the paint's colorfilter (or NULL) |
| */ |
| SkColorFilter* getColorFilter() const { return fColorFilter; } |
| |
| /** Set or clear the paint's colorfilter, returning the parameter. |
| <p /> |
| If the paint already has a filter, its reference count is decremented. |
| If filter is not NULL, its reference count is incremented. |
| @param filter May be NULL. The filter to be installed in the paint |
| @return filter |
| */ |
| SkColorFilter* setColorFilter(SkColorFilter* filter); |
| |
| /** Get the paint's xfermode object. |
| <p /> |
| The xfermode's reference count is not affected. |
| @return the paint's xfermode (or NULL) |
| */ |
| SkXfermode* getXfermode() const { return fXfermode; } |
| |
| /** Set or clear the xfermode object. |
| <p /> |
| Pass NULL to clear any previous xfermode. |
| As a convenience, the parameter passed is also returned. |
| If a previous xfermode exists, its reference count is decremented. |
| If xfermode is not NULL, its reference count is incremented. |
| @param xfermode May be NULL. The new xfermode to be installed in the |
| paint |
| @return xfermode |
| */ |
| SkXfermode* setXfermode(SkXfermode* xfermode); |
| |
| /** Helper for setXfermode, passing the corresponding xfermode object |
| returned from the PorterDuff factory. |
| @param mode The porter-duff mode used to create an xfermode for the |
| paint. |
| @return the resulting xfermode object (or NULL if the mode is |
| SrcOver) |
| */ |
| SkXfermode* setPorterDuffXfermode(SkPorterDuff::Mode mode); |
| |
| /** Get the paint's patheffect object. |
| <p /> |
| The patheffect reference count is not affected. |
| @return the paint's patheffect (or NULL) |
| */ |
| SkPathEffect* getPathEffect() const { return fPathEffect; } |
| |
| /** Set or clear the patheffect object. |
| <p /> |
| Pass NULL to clear any previous patheffect. |
| As a convenience, the parameter passed is also returned. |
| If a previous patheffect exists, its reference count is decremented. |
| If patheffect is not NULL, its reference count is incremented. |
| @param effect May be NULL. The new patheffect to be installed in the |
| paint |
| @return effect |
| */ |
| SkPathEffect* setPathEffect(SkPathEffect* effect); |
| |
| /** Get the paint's maskfilter object. |
| <p /> |
| The maskfilter reference count is not affected. |
| @return the paint's maskfilter (or NULL) |
| */ |
| SkMaskFilter* getMaskFilter() const { return fMaskFilter; } |
| |
| /** Set or clear the maskfilter object. |
| <p /> |
| Pass NULL to clear any previous maskfilter. |
| As a convenience, the parameter passed is also returned. |
| If a previous maskfilter exists, its reference count is decremented. |
| If maskfilter is not NULL, its reference count is incremented. |
| @param maskfilter May be NULL. The new maskfilter to be installed in |
| the paint |
| @return maskfilter |
| */ |
| SkMaskFilter* setMaskFilter(SkMaskFilter* maskfilter); |
| |
| // These attributes are for text/fonts |
| |
| /** Get the paint's typeface object. |
| <p /> |
| The typeface object identifies which font to use when drawing or |
| measuring text. The typeface reference count is not affected. |
| @return the paint's typeface (or NULL) |
| */ |
| SkTypeface* getTypeface() const { return fTypeface; } |
| |
| /** Set or clear the typeface object. |
| <p /> |
| Pass NULL to clear any previous typeface. |
| As a convenience, the parameter passed is also returned. |
| If a previous typeface exists, its reference count is decremented. |
| If typeface is not NULL, its reference count is incremented. |
| @param typeface May be NULL. The new typeface to be installed in the |
| paint |
| @return typeface |
| */ |
| SkTypeface* setTypeface(SkTypeface* typeface); |
| |
| /** Get the paint's rasterizer (or NULL). |
| <p /> |
| The raster controls how paths/text are turned into alpha masks. |
| @return the paint's rasterizer (or NULL) |
| */ |
| SkRasterizer* getRasterizer() const { return fRasterizer; } |
| |
| /** Set or clear the rasterizer object. |
| <p /> |
| Pass NULL to clear any previous rasterizer. |
| As a convenience, the parameter passed is also returned. |
| If a previous rasterizer exists in the paint, its reference count is |
| decremented. If rasterizer is not NULL, its reference count is |
| incremented. |
| @param rasterizer May be NULL. The new rasterizer to be installed in |
| the paint. |
| @return rasterizer |
| */ |
| SkRasterizer* setRasterizer(SkRasterizer* rasterizer); |
| |
| SkDrawLooper* getLooper() const { return fLooper; } |
| SkDrawLooper* setLooper(SkDrawLooper*); |
| |
| enum Align { |
| kLeft_Align, |
| kCenter_Align, |
| kRight_Align, |
| |
| kAlignCount |
| }; |
| /** Return the paint's Align value for drawing text. |
| @return the paint's Align value for drawing text. |
| */ |
| Align getTextAlign() const { return (Align)fTextAlign; } |
| /** Set the paint's text alignment. |
| @param align set the paint's Align value for drawing text. |
| */ |
| void setTextAlign(Align align); |
| |
| /** Return the paint's text size. |
| @return the paint's text size. |
| */ |
| SkScalar getTextSize() const { return fTextSize; } |
| |
| /** Set the paint's text size. This value must be > 0 |
| @param textSize set the paint's text size. |
| */ |
| void setTextSize(SkScalar textSize); |
| |
| /** Return the paint's horizontal scale factor for text. The default value |
| is 1.0. |
| @return the paint's scale factor in X for drawing/measuring text |
| */ |
| SkScalar getTextScaleX() const { return fTextScaleX; } |
| |
| /** Set the paint's horizontal scale factor for text. The default value |
| is 1.0. Values > 1.0 will stretch the text wider. Values < 1.0 will |
| stretch the text narrower. |
| @param scaleX set the paint's scale factor in X for drawing/measuring |
| text. |
| */ |
| void setTextScaleX(SkScalar scaleX); |
| |
| /** Return the paint's horizontal skew factor for text. The default value |
| is 0. |
| @return the paint's skew factor in X for drawing text. |
| */ |
| SkScalar getTextSkewX() const { return fTextSkewX; } |
| |
| /** Set the paint's horizontal skew factor for text. The default value |
| is 0. For approximating oblique text, use values around -0.25. |
| @param skewX set the paint's skew factor in X for drawing text. |
| */ |
| void setTextSkewX(SkScalar skewX); |
| |
| /** Describes how to interpret the text parameters that are passed to paint |
| methods like measureText() and getTextWidths(). |
| */ |
| enum TextEncoding { |
| kUTF8_TextEncoding, //!< the text parameters are UTF8 |
| kUTF16_TextEncoding, //!< the text parameters are UTF16 |
| kGlyphID_TextEncoding //!< the text parameters are glyph indices |
| }; |
| |
| TextEncoding getTextEncoding() const |
| { |
| return (TextEncoding)fTextEncoding; |
| } |
| |
| void setTextEncoding(TextEncoding encoding); |
| |
| struct FontMetrics { |
| SkScalar fTop; //!< The greatest distance above the baseline for any glyph (will be <= 0) |
| SkScalar fAscent; //!< The recommended distance above the baseline (will be <= 0) |
| SkScalar fDescent; //!< The recommended distance below the baseline (will be >= 0) |
| SkScalar fBottom; //!< The greatest distance below the baseline for any glyph (will be >= 0) |
| SkScalar fLeading; //!< The recommended distance to add between lines of text (will be >= 0) |
| }; |
| |
| /** Return the recommend spacing between lines (which will be |
| fDescent - fAscent + fLeading). |
| If metrics is not null, return in it the font metrics for the |
| typeface/pointsize/etc. currently set in the paint. |
| @param metrics If not null, returns the font metrics for the |
| current typeface/pointsize/etc setting in this |
| paint. |
| @param scale If not 0, return width as if the canvas were scaled |
| by this value |
| @param return the recommended spacing between lines |
| */ |
| SkScalar getFontMetrics(FontMetrics* metrics, SkScalar scale = 0) const; |
| |
| /** Return the recommend line spacing. This will be |
| fDescent - fAscent + fLeading |
| */ |
| SkScalar getFontSpacing() const { return this->getFontMetrics(NULL, 0); } |
| |
| /** Convert the specified text into glyph IDs, returning the number of |
| glyphs ID written. If glyphs is NULL, it is ignore and only the count |
| is returned. |
| */ |
| int textToGlyphs(const void* text, size_t byteLength, |
| uint16_t glyphs[]) const; |
| |
| /** Return the number of drawable units in the specified text buffer. |
| This looks at the current TextEncoding field of the paint. If you also |
| want to have the text converted into glyph IDs, call textToGlyphs |
| instead. |
| */ |
| int countText(const void* text, size_t byteLength) const |
| { |
| return this->textToGlyphs(text, byteLength, NULL); |
| } |
| |
| /** Return the width of the text. |
| @param text The text to be measured |
| @param length Number of bytes of text to measure |
| @param bounds If not NULL, returns the bounds of the text, |
| relative to (0, 0). |
| @param scale If not 0, return width as if the canvas were scaled |
| by this value |
| @return The advance width of the text |
| */ |
| SkScalar measureText(const void* text, size_t length, |
| SkRect* bounds, SkScalar scale = 0) const; |
| |
| /** Return the width of the text. |
| @param text Address of the text |
| @param length Number of bytes of text to measure |
| @return The width of the text |
| */ |
| SkScalar measureText(const void* text, size_t length) const |
| { |
| return this->measureText(text, length, NULL, 0); |
| } |
| |
| /** Specify the direction the text buffer should be processed in breakText() |
| */ |
| enum TextBufferDirection { |
| /** When measuring text for breakText(), begin at the start of the text |
| buffer and proceed forward through the data. This is the default. |
| */ |
| kForward_TextBufferDirection, |
| /** When measuring text for breakText(), begin at the end of the text |
| buffer and proceed backwards through the data. |
| */ |
| kBackward_TextBufferDirection |
| }; |
| |
| /** Return the width of the text. |
| @param text The text to be measured |
| @param length Number of bytes of text to measure |
| @param maxWidth Maximum width. Only the subset of text whose accumulated |
| widths are <= maxWidth are measured. |
| @param measuredWidth Optional. If non-null, this returns the actual |
| width of the measured text. |
| @param tbd Optional. The direction the text buffer should be |
| traversed during measuring. |
| @return The number of bytes of text that were measured. Will be |
| <= length. |
| */ |
| size_t breakText(const void* text, size_t length, SkScalar maxWidth, |
| SkScalar* measuredWidth = NULL, |
| TextBufferDirection tbd = kForward_TextBufferDirection) |
| const; |
| |
| /** Return the advance widths for the characters in the string. |
| @param text the text |
| @param byteLength number of bytes to of text |
| @param widths If not null, returns the array of advance widths of |
| the glyphs. If not NULL, must be at least a large |
| as the number of unichars in the specified text. |
| @param bounds If not null, returns the bounds for each of |
| character, relative to (0, 0) |
| @return the number of unichars in the specified text. |
| */ |
| int getTextWidths(const void* text, size_t byteLength, SkScalar widths[], |
| SkRect bounds[] = NULL) const; |
| |
| /** Return the path (outline) for the specified text. |
| Note: just like SkCanvas::drawText, this will respect the Align setting |
| in the paint. |
| */ |
| void getTextPath(const void* text, size_t length, SkScalar x, SkScalar y, |
| SkPath* path) const; |
| |
| private: |
| SkTypeface* fTypeface; |
| SkScalar fTextSize; |
| SkScalar fTextScaleX; |
| SkScalar fTextSkewX; |
| |
| SkPathEffect* fPathEffect; |
| SkShader* fShader; |
| SkXfermode* fXfermode; |
| SkMaskFilter* fMaskFilter; |
| SkColorFilter* fColorFilter; |
| SkRasterizer* fRasterizer; |
| SkDrawLooper* fLooper; |
| |
| SkColor fColor; |
| SkScalar fWidth; |
| SkScalar fMiterLimit; |
| unsigned fFlags : 9; |
| unsigned fTextAlign : 2; |
| unsigned fCapType : 2; |
| unsigned fJoinType : 2; |
| unsigned fStyle : 2; |
| unsigned fTextEncoding : 2; // 3 values |
| |
| SkDrawCacheProc getDrawCacheProc() const; |
| SkMeasureCacheProc getMeasureCacheProc(TextBufferDirection dir, |
| bool needFullMetrics) const; |
| |
| SkScalar measure_text(SkGlyphCache*, const char* text, size_t length, |
| int* count, SkRect* bounds) const; |
| |
| SkGlyphCache* detachCache(const SkMatrix*) const; |
| |
| void descriptorProc(const SkMatrix* deviceMatrix, |
| void (*proc)(const SkDescriptor*, void*), |
| void* context) const; |
| |
| enum { |
| kCanonicalTextSizeForPaths = 64 |
| }; |
| friend class SkCanvas; |
| friend class SkDraw; |
| friend class SkAutoGlyphCache; |
| friend class SkTextToPathIter; |
| }; |
| |
| ////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkPathEffect.h" |
| |
| /** \class SkStrokePathEffect |
| |
| SkStrokePathEffect simulates stroking inside a patheffect, allowing the |
| caller to have explicit control of when to stroke a path. Typically this is |
| used if the caller wants to stroke before another patheffect is applied |
| (using SkComposePathEffect or SkSumPathEffect). |
| */ |
| class SkStrokePathEffect : public SkPathEffect { |
| public: |
| SkStrokePathEffect(const SkPaint&); |
| SkStrokePathEffect(SkScalar width, SkPaint::Style, SkPaint::Join, |
| SkPaint::Cap, SkScalar miterLimit = -1); |
| |
| // overrides |
| // This method is not exported to java. |
| virtual bool filterPath(SkPath* dst, const SkPath& src, SkScalar* width); |
| |
| // overrides for SkFlattenable |
| // This method is not exported to java. |
| virtual void flatten(SkFlattenableWriteBuffer&); |
| // This method is not exported to java. |
| virtual Factory getFactory(); |
| |
| private: |
| SkScalar fWidth, fMiter; |
| uint8_t fStyle, fJoin, fCap; |
| |
| static SkFlattenable* CreateProc(SkFlattenableReadBuffer&); |
| SkStrokePathEffect(SkFlattenableReadBuffer&); |
| |
| typedef SkPathEffect INHERITED; |
| |
| // illegal |
| SkStrokePathEffect(const SkStrokePathEffect&); |
| SkStrokePathEffect& operator=(const SkStrokePathEffect&); |
| }; |
| |
| #endif |
| |
