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");
}
}
void draw(SkCanvas* canvas) {
SkTextBlobBuilder builder;
SkPaint paint;
SkFont font;
const SkTextBlobBuilder::RunBuffer& run = builder.allocRunPosH(font, 5, 20);
paint.textToGlyphs("hello", 5, run.glyphs);
SkScalar positions[] = {0, 10, 20, 40, 80};
memcpy(run.pos, positions, sizeof(positions));
canvas->drawTextBlob(builder.make(), 20, 20, paint);
}
sk_sp<SkTextBlob> makeBlob(unsigned blobIndex) {
SkTextBlobBuilder builder;
SkFont font;
font.setSubpixel(true);
font.setEdging(SkFont::Edging::kAntiAlias);
font.setTypeface(fTypeface);
for (unsigned l = 0; l < SK_ARRAY_COUNT(blobConfigs[blobIndex]); ++l) {
unsigned currentGlyph = 0;
for (unsigned c = 0; c < SK_ARRAY_COUNT(blobConfigs[blobIndex][l]); ++c) {
const BlobCfg* cfg = &blobConfigs[blobIndex][l][c];
unsigned count = cfg->count;
if (count > fGlyphs.count() - currentGlyph) {
count = fGlyphs.count() - currentGlyph;
}
if (0 == count) {
break;
}
font.setSize(kFontSize * cfg->scale);
const SkScalar advanceX = font.getSize() * 0.85f;
const SkScalar advanceY = font.getSize() * 1.5f;
SkPoint offset = SkPoint::Make(currentGlyph * advanceX + c * advanceX,
advanceY * l);
switch (cfg->pos) {
case kDefault_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRun(font, count,
offset.x(),
offset.y());
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
} break;
case kScalar_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPosH(font, count,
offset.y());
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < count; ++i) {
*pos.append() = offset.x() + i * advanceX;
}
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar));
} break;
case kPoint_Pos: {
const SkTextBlobBuilder::RunBuffer& buf = builder.allocRunPos(font, count);
SkTDArray<SkScalar> pos;
for (unsigned i = 0; i < count; ++i) {
*pos.append() = offset.x() + i * advanceX;
*pos.append() = offset.y() + i * (advanceY / count);
}
memcpy(buf.glyphs, fGlyphs.begin() + currentGlyph, count * sizeof(uint16_t));
memcpy(buf.pos, pos.begin(), count * sizeof(SkScalar) * 2);
} break;
default:
SK_ABORT("unhandled pos value");
}
currentGlyph += count;
}
}
return builder.make();
}
// 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());
}
}