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skia2/tests/TextBlobTest.cpp
John Stiles 9765973380 Fix cases of variable shadowing in /tests/. 
If we manage to fix all the existing cases of variable shadowing, we
could enable -Wshadow.

Change-Id: Ib8b92275c5da71c4ee48540d434f3afdc45f4067
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438819
Auto-Submit: John Stiles <johnstiles@google.com>
Commit-Queue: Florin Malita <fmalita@google.com>
Reviewed-by: Florin Malita <fmalita@google.com>
2021-08-12 16:11:39 +00:00

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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkSerialProcs.h"
#include "include/core/SkTypeface.h"
#include "include/private/SkTo.h"
#include "src/core/SkTextBlobPriv.h"
#include "tests/Test.h"
#include "tools/ToolUtils.h"
class TextBlobTester {
public:
// This unit test feeds an SkTextBlobBuilder various runs then checks to see if
// the result contains the provided data and merges runs when appropriate.
static void TestBuilder(skiatest::Reporter* reporter) {
SkTextBlobBuilder builder;
// empty run set
RunBuilderTest(reporter, builder, nullptr, 0, nullptr, 0);
RunDef set1[] = {
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 100 },
};
RunBuilderTest(reporter, builder, set1, SK_ARRAY_COUNT(set1), set1, SK_ARRAY_COUNT(set1));
RunDef set2[] = {
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 100, 100 },
};
RunBuilderTest(reporter, builder, set2, SK_ARRAY_COUNT(set2), set2, SK_ARRAY_COUNT(set2));
RunDef set3[] = {
{ 128, SkTextBlobRunIterator::kFull_Positioning, 100, 100 },
};
RunBuilderTest(reporter, builder, set3, SK_ARRAY_COUNT(set3), set3, SK_ARRAY_COUNT(set3));
RunDef set4[] = {
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
};
RunBuilderTest(reporter, builder, set4, SK_ARRAY_COUNT(set4), set4, SK_ARRAY_COUNT(set4));
RunDef set5[] = {
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 200, 150 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 300, 250 },
};
RunDef mergedSet5[] = {
{ 256, SkTextBlobRunIterator::kHorizontal_Positioning, 0, 150 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 0, 250 },
};
RunBuilderTest(reporter, builder, set5, SK_ARRAY_COUNT(set5), mergedSet5,
SK_ARRAY_COUNT(mergedSet5));
RunDef set6[] = {
{ 128, SkTextBlobRunIterator::kFull_Positioning, 100, 100 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 200, 200 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 300, 300 },
};
RunDef mergedSet6[] = {
{ 384, SkTextBlobRunIterator::kFull_Positioning, 0, 0 },
};
RunBuilderTest(reporter, builder, set6, SK_ARRAY_COUNT(set6), mergedSet6,
SK_ARRAY_COUNT(mergedSet6));
RunDef set7[] = {
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 200, 150 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 400, 350 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 400, 350 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 450 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 450 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 100, 550 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 200, 650 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 400, 750 },
{ 128, SkTextBlobRunIterator::kFull_Positioning, 400, 850 },
};
RunDef mergedSet7[] = {
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 150 },
{ 256, SkTextBlobRunIterator::kHorizontal_Positioning, 0, 150 },
{ 256, SkTextBlobRunIterator::kFull_Positioning, 0, 0 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 450 },
{ 128, SkTextBlobRunIterator::kDefault_Positioning, 100, 450 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 0, 550 },
{ 128, SkTextBlobRunIterator::kHorizontal_Positioning, 0, 650 },
{ 256, SkTextBlobRunIterator::kFull_Positioning, 0, 0 },
};
RunBuilderTest(reporter, builder, set7, SK_ARRAY_COUNT(set7), mergedSet7,
SK_ARRAY_COUNT(mergedSet7));
}
// This unit test verifies blob bounds computation.
static void TestBounds(skiatest::Reporter* reporter) {
SkTextBlobBuilder builder;
SkFont font;
// Explicit bounds.
{
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, !blob);
}
{
SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
builder.allocRun(font, 16, 0, 0, &r1);
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, blob->bounds() == r1);
}
{
SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
builder.allocRunPosH(font, 16, 0, &r1);
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, blob->bounds() == r1);
}
{
SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
builder.allocRunPos(font, 16, &r1);
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, blob->bounds() == r1);
}
{
SkRect r1 = SkRect::MakeXYWH(10, 10, 20, 20);
SkRect r2 = SkRect::MakeXYWH(15, 20, 50, 50);
SkRect r3 = SkRect::MakeXYWH(0, 5, 10, 5);
builder.allocRun(font, 16, 0, 0, &r1);
builder.allocRunPosH(font, 16, 0, &r2);
builder.allocRunPos(font, 16, &r3);
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, blob->bounds() == SkRect::MakeXYWH(0, 5, 65, 65));
}
{
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, !blob);
}
// Implicit bounds
{
// Exercise the empty bounds path, and ensure that RunRecord-aligned pos buffers
// don't trigger asserts (http://crbug.com/542643).
font.setSize(0);
const char* txt = "BOOO";
const size_t txtLen = strlen(txt);
const int glyphCount = font.countText(txt, txtLen, SkTextEncoding::kUTF8);
const SkTextBlobBuilder::RunBuffer& buffer = builder.allocRunPos(font, glyphCount);
font.textToGlyphs(txt, txtLen, SkTextEncoding::kUTF8, buffer.glyphs, glyphCount);
memset(buffer.pos, 0, sizeof(SkScalar) * glyphCount * 2);
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, blob->bounds().isEmpty());
}
}
// Verify that text-related properties are captured in run paints.
static void TestPaintProps(skiatest::Reporter* reporter) {
SkFont font;
// Kitchen sink font.
font.setSize(42);
font.setScaleX(4.2f);
font.setTypeface(ToolUtils::create_portable_typeface());
font.setSkewX(0.42f);
font.setHinting(SkFontHinting::kFull);
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
font.setEmbolden(true);
font.setLinearMetrics(true);
font.setSubpixel(true);
font.setEmbeddedBitmaps(true);
font.setForceAutoHinting(true);
// Ensure we didn't pick default values by mistake.
SkFont defaultFont;
REPORTER_ASSERT(reporter, defaultFont.getSize() != font.getSize());
REPORTER_ASSERT(reporter, defaultFont.getScaleX() != font.getScaleX());
REPORTER_ASSERT(reporter, defaultFont.getTypefaceOrDefault() != font.getTypefaceOrDefault());
REPORTER_ASSERT(reporter, defaultFont.getSkewX() != font.getSkewX());
REPORTER_ASSERT(reporter, defaultFont.getHinting() != font.getHinting());
REPORTER_ASSERT(reporter, defaultFont.getEdging() != font.getEdging());
REPORTER_ASSERT(reporter, defaultFont.isEmbolden() != font.isEmbolden());
REPORTER_ASSERT(reporter, defaultFont.isLinearMetrics() != font.isLinearMetrics());
REPORTER_ASSERT(reporter, defaultFont.isSubpixel() != font.isSubpixel());
REPORTER_ASSERT(reporter,
defaultFont.isEmbeddedBitmaps() != font.isEmbeddedBitmaps());
REPORTER_ASSERT(reporter, defaultFont.isForceAutoHinting() != font.isForceAutoHinting());
SkTextBlobBuilder builder;
AddRun(font, 1, SkTextBlobRunIterator::kDefault_Positioning, SkPoint::Make(0, 0), builder);
AddRun(font, 1, SkTextBlobRunIterator::kHorizontal_Positioning, SkPoint::Make(0, 0),
builder);
AddRun(font, 1, SkTextBlobRunIterator::kFull_Positioning, SkPoint::Make(0, 0), builder);
sk_sp<SkTextBlob> blob(builder.make());
SkTextBlobRunIterator it(blob.get());
while (!it.done()) {
REPORTER_ASSERT(reporter, it.font() == font);
it.next();
}
}
private:
struct RunDef {
unsigned count;
SkTextBlobRunIterator::GlyphPositioning pos;
SkScalar x, y;
};
static void RunBuilderTest(skiatest::Reporter* reporter, SkTextBlobBuilder& builder,
const RunDef in[], unsigned inCount,
const RunDef out[], unsigned outCount) {
SkFont font;
for (unsigned i = 0; i < inCount; ++i) {
AddRun(font, in[i].count, in[i].pos, SkPoint::Make(in[i].x, in[i].y), builder);
}
sk_sp<SkTextBlob> blob(builder.make());
REPORTER_ASSERT(reporter, (inCount > 0) == SkToBool(blob));
if (!blob) {
return;
}
SkTextBlobRunIterator it(blob.get());
for (unsigned i = 0; i < outCount; ++i) {
REPORTER_ASSERT(reporter, !it.done());
REPORTER_ASSERT(reporter, out[i].pos == it.positioning());
REPORTER_ASSERT(reporter, out[i].count == it.glyphCount());
if (SkTextBlobRunIterator::kDefault_Positioning == out[i].pos) {
REPORTER_ASSERT(reporter, out[i].x == it.offset().x());
REPORTER_ASSERT(reporter, out[i].y == it.offset().y());
} else if (SkTextBlobRunIterator::kHorizontal_Positioning == out[i].pos) {
REPORTER_ASSERT(reporter, out[i].y == it.offset().y());
}
for (unsigned k = 0; k < it.glyphCount(); ++k) {
REPORTER_ASSERT(reporter, k % 128 == it.glyphs()[k]);
if (SkTextBlobRunIterator::kHorizontal_Positioning == it.positioning()) {
REPORTER_ASSERT(reporter, SkIntToScalar(k % 128) == it.pos()[k]);
} else if (SkTextBlobRunIterator::kFull_Positioning == it.positioning()) {
REPORTER_ASSERT(reporter, SkIntToScalar(k % 128) == it.pos()[k * 2]);
REPORTER_ASSERT(reporter, -SkIntToScalar(k % 128) == it.pos()[k * 2 + 1]);
}
}
it.next();
}
REPORTER_ASSERT(reporter, it.done());
}
static void AddRun(const SkFont& font, int count, SkTextBlobRunIterator::GlyphPositioning pos,
const SkPoint& offset, SkTextBlobBuilder& builder,
const SkRect* bounds = nullptr) {
switch (pos) {
case SkTextBlobRunIterator::kDefault_Positioning: {
const SkTextBlobBuilder::RunBuffer& rb = builder.allocRun(font, count, offset.x(),
offset.y(), bounds);
for (int i = 0; i < count; ++i) {
rb.glyphs[i] = i;
}
} break;
case SkTextBlobRunIterator::kHorizontal_Positioning: {
const SkTextBlobBuilder::RunBuffer& rb = builder.allocRunPosH(font, count, offset.y(),
bounds);
for (int i = 0; i < count; ++i) {
rb.glyphs[i] = i;
rb.pos[i] = SkIntToScalar(i);
}
} break;
case SkTextBlobRunIterator::kFull_Positioning: {
const SkTextBlobBuilder::RunBuffer& rb = builder.allocRunPos(font, count, bounds);
for (int i = 0; i < count; ++i) {
rb.glyphs[i] = i;
rb.pos[i * 2] = SkIntToScalar(i);
rb.pos[i * 2 + 1] = -SkIntToScalar(i);
}
} break;
default:
SK_ABORT("unhandled positioning value");
}
}
};
DEF_TEST(TextBlob_builder, reporter) {
TextBlobTester::TestBuilder(reporter);
TextBlobTester::TestBounds(reporter);
}
DEF_TEST(TextBlob_paint, reporter) {
TextBlobTester::TestPaintProps(reporter);
}
DEF_TEST(TextBlob_extended, reporter) {
SkTextBlobBuilder textBlobBuilder;
SkFont font;
const char text1[] = "Foo";
const char text2[] = "Bar";
int glyphCount = font.countText(text1, strlen(text1), SkTextEncoding::kUTF8);
SkAutoTMalloc<uint16_t> glyphs(glyphCount);
(void)font.textToGlyphs(text1, strlen(text1), SkTextEncoding::kUTF8, glyphs.get(), glyphCount);
auto run = textBlobBuilder.allocRunText(font, glyphCount, 0, 0, SkToInt(strlen(text2)));
memcpy(run.glyphs, glyphs.get(), sizeof(uint16_t) * glyphCount);
memcpy(run.utf8text, text2, strlen(text2));
for (int i = 0; i < glyphCount; ++i) {
run.clusters[i] = std::min(SkToU32(i), SkToU32(strlen(text2)));
}
sk_sp<SkTextBlob> blob(textBlobBuilder.make());
REPORTER_ASSERT(reporter, blob);
for (SkTextBlobRunIterator it(blob.get()); !it.done(); it.next()) {
REPORTER_ASSERT(reporter, it.glyphCount() == (uint32_t)glyphCount);
for (uint32_t i = 0; i < it.glyphCount(); ++i) {
REPORTER_ASSERT(reporter, it.glyphs()[i] == glyphs[i]);
}
REPORTER_ASSERT(reporter, SkTextBlobRunIterator::kDefault_Positioning == it.positioning());
REPORTER_ASSERT(reporter, (SkPoint{0.0f, 0.0f}) == it.offset());
REPORTER_ASSERT(reporter, it.textSize() > 0);
REPORTER_ASSERT(reporter, it.clusters());
for (uint32_t i = 0; i < it.glyphCount(); ++i) {
REPORTER_ASSERT(reporter, i == it.clusters()[i]);
}
REPORTER_ASSERT(reporter, 0 == strncmp(text2, it.text(), it.textSize()));
}
}
///////////////////////////////////////////////////////////////////////////////////////////////////
#include "include/core/SkCanvas.h"
#include "include/core/SkSurface.h"
#include "include/private/SkTArray.h"
static void add_run(SkTextBlobBuilder* builder, const char text[], SkScalar x, SkScalar y,
sk_sp<SkTypeface> tf) {
SkFont font;
font.setEdging(SkFont::Edging::kAntiAlias);
font.setSubpixel(true);
font.setSize(16);
font.setTypeface(tf);
int glyphCount = font.countText(text, strlen(text), SkTextEncoding::kUTF8);
SkTextBlobBuilder::RunBuffer buffer = builder->allocRun(font, glyphCount, x, y);
(void)font.textToGlyphs(text, strlen(text), SkTextEncoding::kUTF8, buffer.glyphs, glyphCount);
}
static sk_sp<SkImage> render(const SkTextBlob* blob) {
auto surf = SkSurface::MakeRasterN32Premul(SkScalarRoundToInt(blob->bounds().width()),
SkScalarRoundToInt(blob->bounds().height()));
if (!surf) {
return nullptr; // bounds are empty?
}
surf->getCanvas()->clear(SK_ColorWHITE);
surf->getCanvas()->drawTextBlob(blob, -blob->bounds().left(), -blob->bounds().top(), SkPaint());
return surf->makeImageSnapshot();
}
static sk_sp<SkData> SerializeTypeface(SkTypeface* tf, void* ctx) {
auto array = (SkTArray<sk_sp<SkTypeface>>*)ctx;
const size_t idx = array->size();
array->emplace_back(sk_ref_sp(tf));
// In this test, we are deserializing on the same machine, so we don't worry about endianness.
return SkData::MakeWithCopy(&idx, sizeof(idx));
}
static sk_sp<SkTypeface> DeserializeTypeface(const void* data, size_t length, void* ctx) {
auto array = (SkTArray<sk_sp<SkTypeface>>*)ctx;
if (length != sizeof(size_t)) {
SkASSERT(false);
return nullptr;
}
size_t idx = *reinterpret_cast<const size_t*>(data);
if (idx >= array->size()) {
SkASSERT(false);
return nullptr;
}
return (*array)[idx];
}
/*
* Build a blob with more than one typeface.
* Draw it into an offscreen,
* then serialize and deserialize,
* Then draw the new instance and assert it draws the same as the original.
*/
DEF_TEST(TextBlob_serialize, reporter) {
sk_sp<SkTextBlob> blob0 = []() {
sk_sp<SkTypeface> tf = SkTypeface::MakeFromName(nullptr, SkFontStyle::BoldItalic());
SkTextBlobBuilder builder;
add_run(&builder, "Hello", 10, 20, nullptr); // don't flatten a typeface
add_run(&builder, "World", 10, 40, tf); // do flatten this typeface
return builder.make();
}();
SkTArray<sk_sp<SkTypeface>> array;
SkSerialProcs serializeProcs;
serializeProcs.fTypefaceProc = &SerializeTypeface;
serializeProcs.fTypefaceCtx = (void*) &array;
sk_sp<SkData> data = blob0->serialize(serializeProcs);
REPORTER_ASSERT(reporter, array.count() == 1);
SkDeserialProcs deserializeProcs;
deserializeProcs.fTypefaceProc = &DeserializeTypeface;
deserializeProcs.fTypefaceCtx = (void*) &array;
sk_sp<SkTextBlob> blob1 = SkTextBlob::Deserialize(data->data(), data->size(), deserializeProcs);
sk_sp<SkImage> img0 = render(blob0.get());
sk_sp<SkImage> img1 = render(blob1.get());
if (img0 && img1) {
REPORTER_ASSERT(reporter, ToolUtils::equal_pixels(img0.get(), img1.get()));
}
}
DEF_TEST(TextBlob_MakeAsDrawText, reporter) {
const char text[] = "Hello";
auto blob = SkTextBlob::MakeFromString(text, SkFont(), SkTextEncoding::kUTF8);
int runs = 0;
for(SkTextBlobRunIterator it(blob.get()); !it.done(); it.next()) {
REPORTER_ASSERT(reporter, it.glyphCount() == strlen(text));
REPORTER_ASSERT(reporter, it.positioning() == SkTextBlobRunIterator::kFull_Positioning);
runs += 1;
}
REPORTER_ASSERT(reporter, runs == 1);
}
DEF_TEST(TextBlob_iter, reporter) {
sk_sp<SkTypeface> tf = SkTypeface::MakeFromName(nullptr, SkFontStyle::BoldItalic());
SkTextBlobBuilder builder;
add_run(&builder, "Hello", 10, 20, nullptr);
add_run(&builder, "World", 10, 40, tf);
auto blob = builder.make();
SkTextBlob::Iter::Run expected[] = {
{ nullptr, 5, nullptr },
{ tf.get(), 5, nullptr },
};
SkTextBlob::Iter iter(*blob);
SkTextBlob::Iter::Run run;
for (auto exp : expected) {
REPORTER_ASSERT(reporter, iter.next(&run));
REPORTER_ASSERT(reporter, run.fTypeface == exp.fTypeface);
REPORTER_ASSERT(reporter, run.fGlyphCount == exp.fGlyphCount);
for (int i = 0; i < run.fGlyphCount; ++i) {
REPORTER_ASSERT(reporter, run.fGlyphIndices[i] != 0);
}
}
REPORTER_ASSERT(reporter, !iter.next(&run)); // we're done
SkTextBlob::Iter iter2(*blob);
REPORTER_ASSERT(reporter, iter2.next(&run));
// Hello should have the same glyph repeated for the 'l'
REPORTER_ASSERT(reporter, run.fGlyphIndices[2] == run.fGlyphIndices[3]);
}
DEF_TEST(TextBlob_getIntercepts, reporter) {
SkFont font;
font.setSize(16);
SkPoint lowPos[1] = { SkPoint::Make(0, 5) };
SkPoint highPos[1] = { SkPoint::Make(0, -8) };
SkPoint zeroPos[1] = { SkPoint::Make(0, 0) };
// 'x' sitting on baseline
auto blobZeroX = SkTextBlob::MakeFromPosText("x", 1, zeroPos, font);
// 'x' lowered to intersect baseline
auto blobLowX = SkTextBlob::MakeFromPosText("x", 1, lowPos, font);
// 'y' sitting on baseline
auto blobZeroY = SkTextBlob::MakeFromPosText("y", 1, zeroPos, font);
// 'y' raised to not intersect baseline
auto blobHighY = SkTextBlob::MakeFromPosText("y", 1, highPos, font);
// bounds right below baseline
SkScalar bounds[2] = { 1, 2 };
// 'x' on baseline should not intersect
REPORTER_ASSERT(reporter, blobZeroX->getIntercepts(bounds, nullptr) == 0);
// lowered 'x' should intersect
REPORTER_ASSERT(reporter, blobLowX->getIntercepts(bounds, nullptr) == 2);
// 'y' on baseline should intersect
REPORTER_ASSERT(reporter, blobZeroY->getIntercepts(bounds, nullptr) == 2);
// raised 'y' should not intersect
REPORTER_ASSERT(reporter, blobHighY->getIntercepts(bounds, nullptr) == 0);
}
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