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261 lines
9.3 KiB
261 lines
9.3 KiB
/*
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* Copyright 2011 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 "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkFont.h"
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#include "include/core/SkFontStyle.h"
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#include "include/core/SkFontTypes.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkPoint.h"
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#include "include/core/SkRect.h"
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#include "include/core/SkRefCnt.h"
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#include "include/core/SkScalar.h"
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#include "include/core/SkTextBlob.h"
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#include "include/core/SkTypeface.h"
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#include "include/core/SkTypes.h"
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#include "include/private/SkTDArray.h"
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#include "include/private/SkTemplates.h"
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#include "include/private/SkTo.h"
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#include "tools/ToolUtils.h"
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#include <string.h>
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static SkPath create_underline(const SkTDArray<SkScalar>& intersections,
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SkScalar last, SkScalar finalPos,
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SkScalar uPos, SkScalar uWidth, SkScalar textSize) {
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SkPath underline;
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SkScalar end = last;
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for (int index = 0; index < intersections.count(); index += 2) {
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SkScalar start = intersections[index] - uWidth;
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end = intersections[index + 1] + uWidth;
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if (start > last && last + textSize / 12 < start) {
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underline.moveTo(last, uPos);
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underline.lineTo(start, uPos);
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}
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last = end;
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}
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if (end < finalPos) {
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underline.moveTo(end, uPos);
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underline.lineTo(finalPos, uPos);
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}
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return underline;
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}
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namespace {
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sk_sp<SkTextBlob> MakeFancyBlob(const SkPaint& paint, const SkFont& font, const char* text) {
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const size_t textLen = strlen(text);
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const int glyphCount = font.countText(text, textLen, SkTextEncoding::kUTF8);
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SkAutoTArray<SkGlyphID> glyphs(glyphCount);
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font.textToGlyphs(text, textLen, SkTextEncoding::kUTF8, glyphs.get(), glyphCount);
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SkAutoTArray<SkScalar> widths(glyphCount);
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font.getWidths(glyphs.get(), glyphCount, widths.get());
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SkTextBlobBuilder blobBuilder;
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int glyphIndex = 0;
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SkScalar advance = 0;
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// Default-positioned run.
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{
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const int defaultRunLen = glyphCount / 3;
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const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRun(font,
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defaultRunLen,
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advance, 0);
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memcpy(buf.glyphs, glyphs.get(), SkTo<uint32_t>(defaultRunLen) * sizeof(SkGlyphID));
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for (int i = 0; i < defaultRunLen; ++i) {
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advance += widths[glyphIndex++];
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}
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}
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// Horizontal-positioned run.
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{
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const int horizontalRunLen = glyphCount / 3;
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const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPosH(font,
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horizontalRunLen,
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0);
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memcpy(buf.glyphs, glyphs.get() + glyphIndex,
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SkTo<uint32_t>(horizontalRunLen) * sizeof(SkGlyphID));
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for (int i = 0; i < horizontalRunLen; ++i) {
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buf.pos[i] = advance;
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advance += widths[glyphIndex++];
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}
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}
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// Full-positioned run.
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{
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const int fullRunLen = glyphCount - glyphIndex;
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const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRunPos(font, fullRunLen);
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memcpy(buf.glyphs, glyphs.get() + glyphIndex,
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SkTo<uint32_t>(fullRunLen) * sizeof(SkGlyphID));
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for (int i = 0; i < fullRunLen; ++i) {
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buf.pos[i * 2 + 0] = advance; // x offset
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buf.pos[i * 2 + 1] = 0; // y offset
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advance += widths[glyphIndex++];
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}
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}
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return blobBuilder.make();
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}
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} // namespace
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DEF_SIMPLE_GM(fancyblobunderline, canvas, 1480, 1380) {
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SkPaint paint;
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paint.setAntiAlias(true);
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const char* fam[] = { "sans-serif", "serif", "monospace" };
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const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
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const SkPoint blobOffset = { 10, 80 };
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for (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
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for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
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SkFont skFont(ToolUtils::create_portable_typeface(fam[font], SkFontStyle()), textSize);
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const SkScalar uWidth = textSize / 15;
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paint.setStrokeWidth(uWidth);
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paint.setStyle(SkPaint::kFill_Style);
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sk_sp<SkTextBlob> blob = MakeFancyBlob(paint, skFont, test);
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canvas->drawTextBlob(blob, blobOffset.x(), blobOffset.y(), paint);
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const SkScalar uPos = uWidth;
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const SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
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const int interceptCount = blob->getIntercepts(bounds, nullptr, &paint);
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SkASSERT(!(interceptCount % 2));
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SkTDArray<SkScalar> intercepts;
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intercepts.setCount(interceptCount);
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blob->getIntercepts(bounds, intercepts.begin(), &paint);
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const SkScalar start = blob->bounds().left();
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const SkScalar end = blob->bounds().right();
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SkPath underline = create_underline(intercepts, start, end, uPos, uWidth, textSize);
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underline.offset(blobOffset.x(), blobOffset.y());
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawPath(underline, paint);
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canvas->translate(0, textSize * 1.3f);
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}
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canvas->translate(0, 60);
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}
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}
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///////////////////////////////////////////////////////////////////////////////////////////////////
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static sk_sp<SkTextBlob> make_text(const SkFont& font, const SkGlyphID glyphs[], int count) {
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return SkTextBlob::MakeFromText(glyphs, count * sizeof(SkGlyphID), font,
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SkTextEncoding::kGlyphID);
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}
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static sk_sp<SkTextBlob> make_posh(const SkFont& font, const SkGlyphID glyphs[], int count,
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SkScalar spacing) {
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SkAutoTArray<SkScalar> xpos(count);
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font.getXPos(glyphs, count, xpos.get());
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for (int i = 1; i < count; ++i) {
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xpos[i] += spacing * i;
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}
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return SkTextBlob::MakeFromPosTextH(glyphs, count * sizeof(SkGlyphID), xpos.get(), 0, font,
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SkTextEncoding::kGlyphID);
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}
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static sk_sp<SkTextBlob> make_pos(const SkFont& font, const SkGlyphID glyphs[], int count,
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SkScalar spacing) {
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SkAutoTArray<SkPoint> pos(count);
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font.getPos(glyphs, count, pos.get());
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for (int i = 1; i < count; ++i) {
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pos[i].fX += spacing * i;
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}
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return SkTextBlob::MakeFromPosText(glyphs, count * sizeof(SkGlyphID), pos.get(), font,
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SkTextEncoding::kGlyphID);
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}
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// widen the gaps with a margin (on each side of the gap), elimnating segments that go away
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static int trim_with_halo(SkScalar intervals[], int count, SkScalar margin) {
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SkASSERT(count > 0 && (count & 1) == 0);
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int n = count;
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SkScalar* stop = intervals + count;
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*intervals++ -= margin;
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while (intervals < stop - 1) {
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intervals[0] += margin;
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intervals[1] -= margin;
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if (intervals[0] >= intervals[1]) { // went away
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int remaining = stop - intervals - 2;
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SkASSERT(remaining >= 0 && (remaining & 1) == 1);
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if (remaining > 0) {
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memmove(intervals, intervals + 2, remaining * sizeof(SkScalar));
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}
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stop -= 2;
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n -= 2;
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} else {
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intervals += 2;
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}
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}
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*intervals += margin;
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return n;
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}
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static void draw_blob_adorned(SkCanvas* canvas, sk_sp<SkTextBlob> blob) {
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SkPaint paint;
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canvas->drawTextBlob(blob.get(), 0, 0, paint);
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const SkScalar yminmax[] = { 8, 16 };
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int count = blob->getIntercepts(yminmax, nullptr);
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if (!count) {
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return;
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}
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SkAutoTArray<SkScalar> intervals(count);
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blob->getIntercepts(yminmax, intervals.get());
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count = trim_with_halo(intervals.get(), count, SkScalarHalf(yminmax[1] - yminmax[0]) * 1.5f);
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SkASSERT(count >= 2);
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const SkScalar y = SkScalarAve(yminmax[0], yminmax[1]);
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SkScalar end = 900;
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SkPath path;
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path.moveTo({0, y});
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for (int i = 0; i < count; i += 2) {
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path.lineTo(intervals[i], y).moveTo(intervals[i+1], y);
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}
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if (intervals[count - 1] < end) {
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path.lineTo(end, y);
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}
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(yminmax[1] - yminmax[0]);
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canvas->drawPath(path, paint);
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}
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DEF_SIMPLE_GM(textblob_intercepts, canvas, 940, 800) {
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const char text[] = "Hyjay {worlp}.";
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const size_t length = strlen(text);
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SkFont font;
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font.setTypeface(ToolUtils::create_portable_typeface());
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font.setSize(100);
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font.setEdging(SkFont::Edging::kAntiAlias);
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const int count = font.countText(text, length, SkTextEncoding::kUTF8);
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SkAutoTArray<SkGlyphID> glyphs(count);
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font.textToGlyphs(text, length, SkTextEncoding::kUTF8, glyphs.get(), count);
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auto b0 = make_text(font, glyphs.get(), count);
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canvas->translate(20, 120);
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draw_blob_adorned(canvas, b0);
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for (SkScalar spacing = 0; spacing < 30; spacing += 20) {
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auto b1 = make_posh(font, glyphs.get(), count, spacing);
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auto b2 = make_pos( font, glyphs.get(), count, spacing);
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canvas->translate(0, 150);
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draw_blob_adorned(canvas, b1);
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canvas->translate(0, 150);
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draw_blob_adorned(canvas, b2);
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}
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}
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