5d4dd8bef5
Now that line wrap is possible, handle it. Change-Id: Ibe2c849cedfd91167c2d48352999052b61d47e9d Reviewed-on: https://skia-review.googlesource.com/99885 Reviewed-by: Hal Canary <halcanary@google.com> Commit-Queue: Ben Wagner <bungeman@google.com>
77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/*
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* Copyright 2016 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SkShaper.h"
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#include "SkStream.h"
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#include "SkTextBlob.h"
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#include "SkTypeface.h"
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struct SkShaper::Impl {
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sk_sp<SkTypeface> fTypeface;
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};
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SkShaper::SkShaper(sk_sp<SkTypeface> tf) : fImpl(new Impl) {
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fImpl->fTypeface = tf ? std::move(tf) : SkTypeface::MakeDefault();
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}
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SkShaper::~SkShaper() {}
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bool SkShaper::good() const { return true; }
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// This example only uses public API, so we don't use SkUTF8_NextUnichar.
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unsigned utf8_lead_byte_to_count(const char* ptr) {
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uint8_t c = *(const uint8_t*)ptr;
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SkASSERT(c <= 0xF7);
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SkASSERT((c & 0xC0) != 0x80);
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return (((0xE5 << 24) >> ((unsigned)c >> 4 << 1)) & 3) + 1;
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}
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SkPoint SkShaper::shape(SkTextBlobBuilder* builder,
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const SkPaint& srcPaint,
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const char* utf8text,
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size_t textBytes,
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bool leftToRight,
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SkPoint point,
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SkScalar width) const {
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sk_ignore_unused_variable(leftToRight);
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SkPaint paint(srcPaint);
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paint.setTypeface(fImpl->fTypeface);
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paint.setTextEncoding(SkPaint::kUTF8_TextEncoding);
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int glyphCount = paint.countText(utf8text, textBytes);
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if (glyphCount <= 0) {
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return point;
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}
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SkRect bounds;
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SkPaint::FontMetrics metrics;
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paint.getFontMetrics(&metrics);
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point.fY -= metrics.fAscent;
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(void)paint.measureText(utf8text, textBytes, &bounds);
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paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
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const SkTextBlobBuilder::RunBuffer& runBuffer =
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builder->allocRunTextPosH(paint, glyphCount, point.y(), textBytes, SkString(), &bounds);
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memcpy(runBuffer.utf8text, utf8text, textBytes);
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const char* txtPtr = utf8text;
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for (int i = 0; i < glyphCount; ++i) {
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// Each charater maps to exactly one glyph via SkGlyphCache::unicharToGlyph().
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runBuffer.clusters[i] = SkToU32(txtPtr - utf8text);
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txtPtr += utf8_lead_byte_to_count(txtPtr);
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SkASSERT(txtPtr <= utf8text + textBytes);
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}
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paint.setTextEncoding(SkPaint::kUTF8_TextEncoding);
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(void)paint.textToGlyphs(utf8text, textBytes, runBuffer.glyphs);
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(void)paint.getTextWidths(utf8text, textBytes, runBuffer.pos);
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SkScalar x = point.x();
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for (int i = 0; i < glyphCount; ++i) {
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SkScalar w = runBuffer.pos[i];
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runBuffer.pos[i] = x;
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x += w;
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}
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point.fY += metrics.fDescent + metrics.fLeading;
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return point;
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}
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