skia2/gm/texteffects.cpp
fmalita eae6a91277 SkPaint intercept API for SkTextBlob and horizontal text
Add getPosTextHIntercepts(), getTextBlobIntercepts().

Consolidate the implementation in GetTextIntercepts<> template.

BUG=chormium:581456
R=caryclark@google.com,reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2186663004

Review-Url: https://codereview.chromium.org/2186663004
2016-07-28 09:47:24 -07:00

499 lines
17 KiB
C++

/*
* 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 "SkBlurMask.h"
#include "SkBlurMaskFilter.h"
#include "SkReadBuffer.h"
#include "SkTextBlob.h"
#include "SkWriteBuffer.h"
#include "SkLayerRasterizer.h"
static void r0(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
p.setMaskFilter(SkBlurMaskFilter::Make(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(SkIntToScalar(3))));
rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
p.setMaskFilter(nullptr);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1);
rastBuilder->addLayer(p);
p.setAlpha(0x11);
p.setStyle(SkPaint::kFill_Style);
p.setXfermodeMode(SkXfermode::kSrc_Mode);
rastBuilder->addLayer(p);
}
static void r1(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
rastBuilder->addLayer(p);
p.setAlpha(0x40);
p.setXfermodeMode(SkXfermode::kSrc_Mode);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1*2);
rastBuilder->addLayer(p);
}
static void r2(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
p.setStyle(SkPaint::kStrokeAndFill_Style);
p.setStrokeWidth(SK_Scalar1*4);
rastBuilder->addLayer(p);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1*3/2);
p.setXfermodeMode(SkXfermode::kClear_Mode);
rastBuilder->addLayer(p);
}
static void r3(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1*3);
rastBuilder->addLayer(p);
p.setAlpha(0x20);
p.setStyle(SkPaint::kFill_Style);
p.setXfermodeMode(SkXfermode::kSrc_Mode);
rastBuilder->addLayer(p);
}
static void r4(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
p.setAlpha(0x60);
rastBuilder->addLayer(p, SkIntToScalar(3), SkIntToScalar(3));
p.setAlpha(0xFF);
p.setXfermodeMode(SkXfermode::kClear_Mode);
rastBuilder->addLayer(p, SK_Scalar1*3/2, SK_Scalar1*3/2);
p.setXfermode(nullptr);
rastBuilder->addLayer(p);
}
#include "SkDiscretePathEffect.h"
static void r5(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
rastBuilder->addLayer(p);
p.setPathEffect(SkDiscretePathEffect::Make(SK_Scalar1*4, SK_Scalar1*3));
p.setXfermodeMode(SkXfermode::kSrcOut_Mode);
rastBuilder->addLayer(p);
}
static void r6(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
rastBuilder->addLayer(p);
p.setAntiAlias(false);
SkLayerRasterizer::Builder rastBuilder2;
r5(&rastBuilder2, p);
p.setRasterizer(rastBuilder2.detach());
p.setXfermodeMode(SkXfermode::kClear_Mode);
rastBuilder->addLayer(p);
}
#include "Sk2DPathEffect.h"
static sk_sp<SkPathEffect> MakeDotEffect(SkScalar radius, const SkMatrix& matrix) {
SkPath path;
path.addCircle(0, 0, radius);
return SkPath2DPathEffect::Make(matrix, path);
}
static void r7(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
SkMatrix lattice;
lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
p.setPathEffect(MakeDotEffect(SK_Scalar1*4, lattice));
rastBuilder->addLayer(p);
}
static void r8(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
rastBuilder->addLayer(p);
SkMatrix lattice;
lattice.setScale(SK_Scalar1*6, SK_Scalar1*6, 0, 0);
lattice.postSkew(SK_Scalar1/3, 0, 0, 0);
p.setPathEffect(MakeDotEffect(SK_Scalar1*2, lattice));
p.setXfermodeMode(SkXfermode::kClear_Mode);
rastBuilder->addLayer(p);
p.setPathEffect(nullptr);
p.setXfermode(nullptr);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1);
rastBuilder->addLayer(p);
}
static void r9(SkLayerRasterizer::Builder* rastBuilder, SkPaint& p) {
rastBuilder->addLayer(p);
SkMatrix lattice;
lattice.setScale(SK_Scalar1, SK_Scalar1*6, 0, 0);
lattice.postRotate(SkIntToScalar(30), 0, 0);
p.setPathEffect(SkLine2DPathEffect::Make(SK_Scalar1*2, lattice));
p.setXfermodeMode(SkXfermode::kClear_Mode);
rastBuilder->addLayer(p);
p.setPathEffect(nullptr);
p.setXfermode(nullptr);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(SK_Scalar1);
rastBuilder->addLayer(p);
}
typedef void (*raster_proc)(SkLayerRasterizer::Builder*, SkPaint&);
static const raster_proc gRastProcs[] = {
r0, r1, r2, r3, r4, r5, r6, r7, r8, r9
};
#include "SkXfermode.h"
static void apply_shader(SkPaint* paint, int index) {
raster_proc proc = gRastProcs[index];
if (proc) {
SkPaint p;
SkLayerRasterizer::Builder rastBuilder;
p.setAntiAlias(true);
proc(&rastBuilder, p);
paint->setRasterizer(rastBuilder.detach());
}
#if 0
SkScalar dir[] = { SK_Scalar1, SK_Scalar1, SK_Scalar1 };
paint->setMaskFilter(SkBlurMaskFilter::CreateEmboss(dir, SK_Scalar1/4, SkIntToScalar(4), SkIntToScalar(3)))->unref();
#endif
paint->setColor(SK_ColorBLUE);
}
DEF_SIMPLE_GM(texteffects, canvas, 460, 680) {
canvas->save();
SkPaint paint;
paint.setAntiAlias(true);
sk_tool_utils::set_portable_typeface(&paint);
paint.setTextSize(SkIntToScalar(56));
SkScalar x = SkIntToScalar(20);
SkScalar y = paint.getTextSize();
SkString str("Hamburgefons");
for (int i = 0; i < static_cast<int>(SK_ARRAY_COUNT(gRastProcs)); i++) {
apply_shader(&paint, i);
// paint.setMaskFilter(nullptr);
// paint.setColor(SK_ColorBLACK);
canvas->drawText(str.c_str(), str.size(), x, y, paint);
y += paint.getFontSpacing();
}
canvas->restore();
}
DEF_SIMPLE_GM(textunderstrike, canvas, 460, 680) {
canvas->clear(SK_ColorYELLOW);
SkPaint paint;
sk_tool_utils::set_portable_typeface(&paint);
paint.setTextSize(50);
paint.setStrokeWidth(5);
paint.setAntiAlias(true);
auto drawText = [&]() {
paint.setStyle(SkPaint::kFill_Style);
canvas->drawText("Hello", 5, 100, 50, paint);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawText("Hello", 5, 100, 100, paint);
canvas->translate(0, 100);
};
drawText();
paint.setUnderlineText(true);
drawText();
paint.setUnderlineText(false);
paint.setStrikeThruText(true);
drawText();
paint.setUnderlineText(true);
drawText();
paint.setColor(SK_ColorWHITE);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawText("Hello", 5, 100, 50, paint);
paint.setColor(SK_ColorBLUE);
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 (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<const 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 sk_sp<const SkTextBlob>(blobBuilder.build());
}
} // 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<const SkTextBlob> blob = MakeFancyBlob(paint, test);
canvas->drawTextBlob(blob.get(), 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);
}
}