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skia2/tests/TextBlobTest.cpp
Ben Wagner 5d9c20ecc9 Make TextBlob 'Text' allocators public. 
This will allow users to create PDFs with the actual text embedded. This
will allow for correct search and copy operations on the generated PDF.

Since these are now public, SkTextBlobBuilderPriv is no longer needed
and is removed. For consistency, the allocRunRSXform overload is renamed
to allocRunTextRSXform.

Change-Id: I44be82d9038a433e1221d5cbfd8ed113ecb6d4fa
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/375017
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2021-02-24 18:48:44 +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).
SkFont font;
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;
unsigned glyphCount = 0;
unsigned posCount = 0;
for (unsigned i = 0; i < inCount; ++i) {
AddRun(font, in[i].count, in[i].pos, SkPoint::Make(in[i].x, in[i].y), builder);
glyphCount += in[i].count;
posCount += in[i].count * in[i].pos;
}
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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