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drawGlyphs API for SkCanvas

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Change-Id: Ieecbb3ec130b2598d21fbe12ab4830046ae95e4f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/394216
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Reed <reed@google.com>
This commit is contained in:
Herb Derby 2021-04-08 12:29:11 -04:00 committed by Skia Commit-Bot
parent e4454aaf23
commit ffef19c51e
2 changed files with 71 additions and 0 deletions
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48
include/core/SkCanvas.h
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@ -1737,6 +1737,54 @@ public:
this->drawSimpleText(str.c_str(), str.size(), SkTextEncoding::kUTF8, x, y, font, paint);
}
/** Draws count glyphs, at positions relative to origin styled with font and paint with
supporting utf8 and cluster information.
This function draw glyphs at the given positions relative to the given origin.
It does not perform typeface fallback for glyphs not found in the SkTypeface in font.
The drawing obeys the current transform matrix and clipping.
All elements of paint: SkPathEffect, SkMaskFilter, SkShader,
SkColorFilter, and SkImageFilter; apply to text. By
default, draws filled black glyphs.
@param count number of glyphs to draw
@param glyphs the array of glyphIDs to draw
@param positions where to draw each glyph relative to origin
@param clusters array of size count of cluster information
@param textByteCount size of the utf8text
@param utf8text utf8text supporting information for the glyphs
@param origin the origin of all the positions
@param font typeface, text size and so, used to describe the text
@param paint blend, color, and so on, used to draw
*/
void drawGlyphs(int count, const SkGlyphID glyphs[], const SkPoint positions[],
const uint32_t clusters[], int textByteCount, const char utf8text[],
SkPoint origin, const SkFont& font, const SkPaint& paint);
/** Draws count glyphs, at positions relative to origin styled with font and paint.
This function draw glyphs at the given positions relative to the given origin.
It does not perform typeface fallback for glyphs not found in the SkTypeface in font.
The drawing obeys the current transform matrix and clipping.
All elements of paint: SkPathEffect, SkMaskFilter, SkShader,
SkColorFilter, and SkImageFilter; apply to text. By
default, draws filled black glyphs.
@param count number of glyphs to draw
@param glyphs the array of glyphIDs to draw
@param positions where to draw each glyph relative to origin
@param origin the origin of all the positions
@param font typeface, text size and so, used to describe the text
@param paint blend, color, and so on, used to draw
*/
void drawGlyphs(int count, const SkGlyphID glyphs[], const SkPoint positions[],
SkPoint origin, const SkFont& font, const SkPaint& paint);
/** Draws SkTextBlob blob at (x, y), using clip, SkMatrix, and SkPaint paint.
blob contains glyphs, their positions, and paint attributes specific to text:

23
src/core/SkCanvas.cpp
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@ -2298,6 +2298,29 @@ void SkCanvas::drawSimpleText(const void* text, size_t byteLength, SkTextEncodin
}
}
void SkCanvas::drawGlyphs(int count, const SkGlyphID glyphs[], const SkPoint positions[],
SkPoint origin, const SkFont& font, const SkPaint& paint) {
if (count <= 0) { return; }
SkTextBlobBuilder builder;
auto buffer = builder.allocRunPos(font, count);
memcpy(buffer.glyphs, glyphs, count * sizeof(SkGlyphID));
memcpy(buffer.points(), positions, count * sizeof(SkPoint));
this->drawTextBlob(builder.make(), origin.x(), origin.y(), paint);
}
void SkCanvas::drawGlyphs(int count, const SkGlyphID* glyphs, const SkPoint* positions,
const uint32_t* clusters, int textByteCount, const char* utf8text,
SkPoint origin, const SkFont& font, const SkPaint& paint) {
if (count <= 0) { return; }
SkTextBlobBuilder builder;
auto buffer = builder.allocRunTextPos(font, count, textByteCount);
memcpy(buffer.glyphs, glyphs, count * sizeof(SkGlyphID));
memcpy(buffer.points(), positions, count * sizeof(SkPoint));
memcpy(buffer.clusters, clusters, count * sizeof(uint32_t));
memcpy(buffer.utf8text, utf8text, textByteCount);
this->drawTextBlob(builder.make(), origin.x(), origin.y(), paint);
}
void SkCanvas::drawTextBlob(const SkTextBlob* blob, SkScalar x, SkScalar y,
const SkPaint& paint) {
TRACE_EVENT0("skia", TRACE_FUNC);