149f22d447
Mainly rearranging the code to perform all ICU iterations once and cache the results for the next text layouts. Change-Id: I514d04229d04778c1f2238064acccddf6b548c00 Reviewed-on: https://skia-review.googlesource.com/c/skia/+/294400 Commit-Queue: Ben Wagner <bungeman@google.com> Commit-Queue: Julia Lavrova <jlavrova@google.com> Reviewed-by: Ben Wagner <bungeman@google.com>
94 lines
3.1 KiB
C++
94 lines
3.1 KiB
C++
// Copyright 2019 Google LLC.
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#ifndef Paragraph_DEFINED
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#define Paragraph_DEFINED
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#include "modules/skparagraph/include/FontCollection.h"
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#include "modules/skparagraph/include/Metrics.h"
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#include "modules/skparagraph/include/ParagraphStyle.h"
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#include "modules/skparagraph/include/TextStyle.h"
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class SkCanvas;
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namespace skia {
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namespace textlayout {
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class Paragraph {
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public:
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Paragraph(ParagraphStyle style, sk_sp<FontCollection> fonts);
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virtual ~Paragraph() = default;
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SkScalar getMaxWidth() { return fWidth; }
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SkScalar getHeight() { return fHeight; }
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SkScalar getMinIntrinsicWidth() { return fMinIntrinsicWidth; }
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SkScalar getMaxIntrinsicWidth() { return fMaxIntrinsicWidth; }
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SkScalar getAlphabeticBaseline() { return fAlphabeticBaseline; }
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SkScalar getIdeographicBaseline() { return fIdeographicBaseline; }
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SkScalar getLongestLine() { return fLongestLine; }
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bool didExceedMaxLines() { return fExceededMaxLines; }
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virtual void layout(SkScalar width) = 0;
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virtual void paint(SkCanvas* canvas, SkScalar x, SkScalar y) = 0;
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// Returns a vector of bounding boxes that enclose all text between
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// start and end glyph indexes, including start and excluding end
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virtual std::vector<TextBox> getRectsForRange(unsigned start,
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unsigned end,
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RectHeightStyle rectHeightStyle,
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RectWidthStyle rectWidthStyle) = 0;
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virtual std::vector<TextBox> getRectsForPlaceholders() = 0;
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// Returns the index of the glyph that corresponds to the provided coordinate,
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// with the top left corner as the origin, and +y direction as down
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virtual PositionWithAffinity getGlyphPositionAtCoordinate(SkScalar dx, SkScalar dy) = 0;
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// Finds the first and last glyphs that define a word containing
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// the glyph at index offset
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virtual SkRange<size_t> getWordBoundary(unsigned offset) = 0;
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virtual void getLineMetrics(std::vector<LineMetrics>&) = 0;
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virtual size_t lineNumber() = 0;
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virtual void markDirty() = 0;
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// This function will return the number of unresolved glyphs or
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// -1 if not applicable (has not been shaped yet - valid case)
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virtual int32_t unresolvedGlyphs() = 0;
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// Experimental API that allows fast way to update "immutable" paragraph
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virtual void updateTextAlign(TextAlign textAlign) = 0;
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virtual void updateText(size_t from, SkString text) = 0;
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virtual void updateFontSize(size_t from, size_t to, SkScalar fontSize) = 0;
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virtual void updateForegroundPaint(size_t from, size_t to, SkPaint paint) = 0;
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virtual void updateBackgroundPaint(size_t from, size_t to, SkPaint paint) = 0;
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protected:
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sk_sp<FontCollection> fFontCollection;
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ParagraphStyle fParagraphStyle;
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// Things for Flutter
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SkScalar fAlphabeticBaseline;
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SkScalar fIdeographicBaseline;
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SkScalar fHeight;
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SkScalar fWidth;
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SkScalar fMaxIntrinsicWidth;
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SkScalar fMinIntrinsicWidth;
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SkScalar fLongestLine;
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bool fExceededMaxLines;
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};
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} // namespace textlayout
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} // namespace skia
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#endif // Paragraph_DEFINED
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