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