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Unified Diff: gm/texteffects.cpp

Issue 1654883003: add helper to create fancy underlines (Closed) Base URL: https://skia.googlesource.com/skia.git@master
Patch Set: correct comment to multiply by two Created 4 years, 10 months ago
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Index: gm/texteffects.cpp
diff --git a/gm/texteffects.cpp b/gm/texteffects.cpp
index 2eb76efa19fb8d4079e7165dac06f0fce7a4218d..6ad3d23bf20db2b598e5a2391bfa026675909770 100644
--- a/gm/texteffects.cpp
+++ b/gm/texteffects.cpp
@@ -228,3 +228,163 @@ DEF_SIMPLE_GM(textunderstrike, canvas, 460, 680) {
paint.setStyle(SkPaint::kFill_Style);
canvas->drawText("Hello", 5, 100, 50, paint);
}
+
+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;
+}
+
+static void find_intercepts(const char* test, size_t len, SkScalar x, SkScalar y,
+ const SkPaint& paint, SkScalar uWidth, SkTDArray<SkScalar>* intersections) {
+ SkScalar uPos = y + uWidth;
+ SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
+ int count = paint.getTextIntercepts(test, len, x, y, bounds, nullptr);
+ SkASSERT(!(count % 2));
+ if (count) {
+ intersections->setCount(count);
+ paint.getTextIntercepts(test, len, x, y, bounds, intersections->begin());
+ }
+}
+
+DEF_SIMPLE_GM(fancyunderline, canvas, 900, 1350) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ const char* fam[] = { "sans-serif", "serif", "monospace" };
+ const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
+ SkPoint textPt = { 10, 80 };
+ for (int font = 0; font < 3; ++font) {
+ sk_tool_utils::set_portable_typeface(&paint, fam[font], SkTypeface::kNormal);
+ for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
+ paint.setTextSize(textSize);
+ const SkScalar uWidth = textSize / 15;
+ paint.setStrokeWidth(uWidth);
+ paint.setStyle(SkPaint::kFill_Style);
+ canvas->drawText(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint);
+
+ SkTDArray<SkScalar> intersections;
+ find_intercepts(test, sizeof(test) - 1, textPt.fX, textPt.fY, paint, uWidth,
+ &intersections);
+
+ SkScalar start = textPt.fX;
+ SkScalar end = paint.measureText(test, sizeof(test) - 1) + textPt.fX;
+ SkScalar uPos = textPt.fY + uWidth;
+ SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(underline, paint);
+
+ canvas->translate(0, textSize * 1.3f);
+ }
+ canvas->translate(0, 60);
+ }
+}
+
+static void find_intercepts(const char* test, size_t len, const SkPoint* pos, const SkPaint& paint,
+ SkScalar uWidth, SkTDArray<SkScalar>* intersections) {
+ SkScalar uPos = pos[0].fY + uWidth;
+ SkScalar bounds[2] = { uPos - uWidth / 2, uPos + uWidth / 2 };
+ int count = paint.getPosTextIntercepts(test, len, pos, bounds, nullptr);
+ SkASSERT(!(count % 2));
+ if (count) {
+ intersections->setCount(count);
+ paint.getPosTextIntercepts(test, len, pos, bounds, intersections->begin());
+ }
+}
+
+DEF_SIMPLE_GM(fancyposunderline, canvas, 900, 1350) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ const char* fam[] = { "sans-serif", "serif", "monospace" };
+ const char test[] = "aAjJgGyY_|{-(~[,]qQ}pP}zZ";
+ SkPoint textPt = { 10, 80 };
+ for (int font = 0; font < 3; ++font) {
+ sk_tool_utils::set_portable_typeface(&paint, fam[font], SkTypeface::kNormal);
+ for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
+ paint.setTextSize(textSize);
+ const SkScalar uWidth = textSize / 15;
+ paint.setStrokeWidth(uWidth);
+ paint.setStyle(SkPaint::kFill_Style);
+ int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr);
+ SkTDArray<SkScalar> widths;
+ widths.setCount(widthCount);
+ (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin());
+ SkTDArray<SkPoint> pos;
+ pos.setCount(widthCount);
+ SkScalar posX = textPt.fX;
+ for (int index = 0; index < widthCount; ++index) {
+ pos[index].fX = posX;
+ posX += widths[index];
+ pos[index].fY = textPt.fY + (textSize / 25) * (index % 4);
+ }
+ canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint);
+
+ SkTDArray<SkScalar> intersections;
+ find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections);
+
+ SkScalar start = textPt.fX;
+ SkScalar end = posX;
+ SkScalar uPos = textPt.fY + uWidth;
+ SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(underline, paint);
+
+ canvas->translate(0, textSize * 1.3f);
+ }
+ canvas->translate(0, 60);
+ }
+}
+
+DEF_SIMPLE_GM(fancyunderlinebars, canvas, 1500, 460) {
+ SkPaint paint;
+ paint.setAntiAlias(true);
+ const char test[] = " .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_ .}]_";
+ SkPoint textPt = { 10, 80 };
+ sk_tool_utils::set_portable_typeface(&paint, "serif");
+ for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
+ paint.setTextSize(textSize);
+ SkScalar uWidth = textSize / 15;
+ paint.setStrokeWidth(uWidth);
+ paint.setStyle(SkPaint::kFill_Style);
+ int widthCount = paint.getTextWidths(test, sizeof(test) - 1, nullptr);
+ SkTDArray<SkScalar> widths;
+ widths.setCount(widthCount);
+ (void) paint.getTextWidths(test, sizeof(test) - 1, widths.begin());
+ SkTDArray<SkPoint> pos;
+ pos.setCount(widthCount);
+ SkScalar posX = textPt.fX;
+ pos[0] = textPt;
+ posX += widths[0];
+ for (int index = 1; index < widthCount; ++index) {
+ pos[index].fX = posX;
+ posX += widths[index];
+ pos[index].fY = textPt.fY - (textSize / 50) * (index / 5) + textSize / 50 * 4;
+ }
+ canvas->drawPosText(test, sizeof(test) - 1, pos.begin(), paint);
+
+ SkTDArray<SkScalar> intersections;
+ find_intercepts(test, sizeof(test) - 1, pos.begin(), paint, uWidth, &intersections);
+
+ SkScalar start = textPt.fX;
+ SkScalar end = posX;
+ SkScalar uPos = pos[0].fY + uWidth;
+ SkPath underline = create_underline(intersections, start, end, uPos, uWidth, textSize);
+ paint.setStyle(SkPaint::kStroke_Style);
+ canvas->drawPath(underline, paint);
+ canvas->translate(0, textSize * 1.3f);
+ }
+}
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