/*
* 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.h"
#include "sk_tool_utils.h"
#include "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkReadBuffer.h"
#include "SkTextBlob.h"
#include "SkWriteBuffer.h"
#include "Sk2DPathEffect.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;
}
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 (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
sk_tool_utils::set_portable_typeface(&paint, fam[font]);
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 (size_t font = 0; font < SK_ARRAY_COUNT(fam); ++font) {
sk_tool_utils::set_portable_typeface(&paint, fam[font]);
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);
}
}
namespace {
sk_sp<SkTextBlob> MakeFancyBlob(const SkPaint& paint, const char* text) {
SkPaint blobPaint(paint);
const size_t textLen = strlen(text);
const int glyphCount = blobPaint.textToGlyphs(text, textLen, nullptr);
SkAutoTArray<SkGlyphID> glyphs(glyphCount);
blobPaint.textToGlyphs(text, textLen, glyphs.get());
blobPaint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
const size_t glyphTextBytes = SkTo<uint32_t>(glyphCount) * sizeof(SkGlyphID);
const int widthCount = blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, nullptr);
SkAssertResult(widthCount == glyphCount);
SkAutoTArray<SkScalar> widths(glyphCount);
blobPaint.getTextWidths(glyphs.get(), glyphTextBytes, widths.get());
SkTextBlobBuilder blobBuilder;
int glyphIndex = 0;
SkScalar advance = 0;
// Default-positioned run.
{
const int defaultRunLen = glyphCount / 3;
const SkTextBlobBuilder::RunBuffer& buf = blobBuilder.allocRun(blobPaint,
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(blobPaint,
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(blobPaint, 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) {
sk_tool_utils::set_portable_typeface(&paint, fam[font]);
for (SkScalar textSize = 100; textSize > 10; textSize -= 20) {
paint.setTextSize(textSize);
const SkScalar uWidth = textSize / 15;
paint.setStrokeWidth(uWidth);
paint.setStyle(SkPaint::kFill_Style);
sk_sp<SkTextBlob> blob = MakeFancyBlob(paint, 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 = paint.getTextBlobIntercepts(blob.get(), bounds, nullptr);
SkASSERT(!(interceptCount % 2));
SkTDArray<SkScalar> intercepts;
intercepts.setCount(interceptCount);
paint.getTextBlobIntercepts(blob.get(), bounds, intercepts.begin());
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);
}
}
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);
}
}