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skia2/tests/PaintTest.cpp
Mike Reed 560d5b3cf1 use font to measure 
Bug: skia:
Change-Id: I571de8f4234bd74c32fe8fba4f8726792b655c45
Reviewed-on: https://skia-review.googlesource.com/c/177887
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2018-12-16 22:02:40 +00:00

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/*
* 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 "SkAutoMalloc.h"
#include "SkBlurMask.h"
#include "SkFont.h"
#include "SkLayerDrawLooper.h"
#include "SkMaskFilter.h"
#include "SkPaintPriv.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkReadBuffer.h"
#include "SkTo.h"
#include "SkTypeface.h"
#include "SkUTF.h"
#include "SkWriteBuffer.h"
#include "Test.h"
#undef ASSERT
static size_t uni_to_utf8(const SkUnichar src[], void* dst, int count) {
char* u8 = (char*)dst;
for (int i = 0; i < count; ++i) {
int n = SkToInt(SkUTF::ToUTF8(src[i], u8));
u8 += n;
}
return u8 - (char*)dst;
}
static size_t uni_to_utf16(const SkUnichar src[], void* dst, int count) {
uint16_t* u16 = (uint16_t*)dst;
for (int i = 0; i < count; ++i) {
int n = SkToInt(SkUTF::ToUTF16(src[i], u16));
u16 += n;
}
return (char*)u16 - (char*)dst;
}
static size_t uni_to_utf32(const SkUnichar src[], void* dst, int count) {
SkUnichar* u32 = (SkUnichar*)dst;
if (src != u32) {
memcpy(u32, src, count * sizeof(SkUnichar));
}
return count * sizeof(SkUnichar);
}
static int find_first_zero(const uint16_t glyphs[], int count) {
for (int i = 0; i < count; ++i) {
if (0 == glyphs[i]) {
return i;
}
}
return count;
}
DEF_TEST(Paint_cmap, reporter) {
// need to implement charsToGlyphs on other backends (e.g. linux, win)
// before we can run this tests everywhere
return;
static const int NGLYPHS = 64;
SkUnichar src[NGLYPHS];
SkUnichar dst[NGLYPHS]; // used for utf8, utf16, utf32 storage
static const struct {
size_t (*fSeedTextProc)(const SkUnichar[], void* dst, int count);
SkTextEncoding fEncoding;
} gRec[] = {
{ uni_to_utf8, kUTF8_SkTextEncoding },
{ uni_to_utf16, kUTF16_SkTextEncoding },
{ uni_to_utf32, kUTF32_SkTextEncoding },
};
SkRandom rand;
SkFont font;
font.setTypeface(SkTypeface::MakeDefault());
SkTypeface* face = font.getTypeface();
for (int i = 0; i < 1000; ++i) {
// generate some random text
for (int j = 0; j < NGLYPHS; ++j) {
src[j] = ' ' + j;
}
// inject some random chars, to sometimes abort early
src[rand.nextU() & 63] = rand.nextU() & 0xFFF;
for (size_t k = 0; k < SK_ARRAY_COUNT(gRec); ++k) {
size_t len = gRec[k].fSeedTextProc(src, dst, NGLYPHS);
uint16_t glyphs0[NGLYPHS], glyphs1[NGLYPHS];
bool contains = font.containsText(dst, len, gRec[k].fEncoding);
int nglyphs = font.textToGlyphs(dst, len, gRec[k].fEncoding, glyphs0, NGLYPHS);
int first = face->charsToGlyphs(dst, (SkTypeface::Encoding)gRec[k].fEncoding,
glyphs1, NGLYPHS);
int index = find_first_zero(glyphs1, NGLYPHS);
REPORTER_ASSERT(reporter, NGLYPHS == nglyphs);
REPORTER_ASSERT(reporter, index == first);
REPORTER_ASSERT(reporter, 0 == memcmp(glyphs0, glyphs1, NGLYPHS * sizeof(uint16_t)));
if (contains) {
REPORTER_ASSERT(reporter, NGLYPHS == first);
} else {
REPORTER_ASSERT(reporter, NGLYPHS > first);
}
}
}
}
// temparary api for bicubic, just be sure we can set/clear it
DEF_TEST(Paint_filterQuality, reporter) {
SkPaint p0, p1;
REPORTER_ASSERT(reporter, kNone_SkFilterQuality == p0.getFilterQuality());
static const SkFilterQuality gQualitys[] = {
kNone_SkFilterQuality,
kLow_SkFilterQuality,
kMedium_SkFilterQuality,
kHigh_SkFilterQuality
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gQualitys); ++i) {
p0.setFilterQuality(gQualitys[i]);
REPORTER_ASSERT(reporter, gQualitys[i] == p0.getFilterQuality());
p1 = p0;
REPORTER_ASSERT(reporter, gQualitys[i] == p1.getFilterQuality());
p0.reset();
REPORTER_ASSERT(reporter, kNone_SkFilterQuality == p0.getFilterQuality());
}
}
DEF_TEST(Paint_copy, reporter) {
SkPaint paint;
// set a few member variables
paint.setStyle(SkPaint::kStrokeAndFill_Style);
paint.setStrokeWidth(SkIntToScalar(2));
// set a few pointers
SkLayerDrawLooper::Builder looperBuilder;
paint.setLooper(looperBuilder.detach());
paint.setMaskFilter(SkMaskFilter::MakeBlur(kNormal_SkBlurStyle,
SkBlurMask::ConvertRadiusToSigma(1)));
// copy the paint using the copy constructor and check they are the same
SkPaint copiedPaint = paint;
REPORTER_ASSERT(reporter, paint == copiedPaint);
// copy the paint using the equal operator and check they are the same
copiedPaint = paint;
REPORTER_ASSERT(reporter, paint == copiedPaint);
// clean the paint and check they are back to their initial states
SkPaint cleanPaint;
paint.reset();
copiedPaint.reset();
REPORTER_ASSERT(reporter, cleanPaint == paint);
REPORTER_ASSERT(reporter, cleanPaint == copiedPaint);
}
// found and fixed for webkit: mishandling when we hit recursion limit on
// mostly degenerate cubic flatness test
DEF_TEST(Paint_regression_cubic, reporter) {
SkPath path, stroke;
SkPaint paint;
path.moveTo(460.2881309415525f,
303.250847066498f);
path.cubicTo(463.36378422175284f,
302.1169735073363f,
456.32239330810046f,
304.720354932878f,
453.15255460013304f,
305.788586869862f);
SkRect fillR, strokeR;
fillR = path.getBounds();
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(SkIntToScalar(2));
paint.getFillPath(path, &stroke);
strokeR = stroke.getBounds();
SkRect maxR = fillR;
SkScalar miter = SkMaxScalar(SK_Scalar1, paint.getStrokeMiter());
SkScalar inset = paint.getStrokeJoin() == SkPaint::kMiter_Join ?
paint.getStrokeWidth() * miter :
paint.getStrokeWidth();
maxR.inset(-inset, -inset);
// test that our stroke didn't explode
REPORTER_ASSERT(reporter, maxR.contains(strokeR));
}
DEF_TEST(Paint_flattening, reporter) {
const SkFilterQuality levels[] = {
kNone_SkFilterQuality,
kLow_SkFilterQuality,
kMedium_SkFilterQuality,
kHigh_SkFilterQuality,
};
const SkFontHinting hinting[] = {
kNo_SkFontHinting,
kSlight_SkFontHinting,
kNormal_SkFontHinting,
kFull_SkFontHinting,
};
const SkPaint::Cap caps[] = {
SkPaint::kButt_Cap,
SkPaint::kRound_Cap,
SkPaint::kSquare_Cap,
};
const SkPaint::Join joins[] = {
SkPaint::kMiter_Join,
SkPaint::kRound_Join,
SkPaint::kBevel_Join,
};
const SkTextEncoding encodings[] = {
kUTF8_SkTextEncoding,
kUTF16_SkTextEncoding,
kUTF32_SkTextEncoding,
kGlyphID_SkTextEncoding,
};
const SkPaint::Style styles[] = {
SkPaint::kFill_Style,
SkPaint::kStroke_Style,
SkPaint::kStrokeAndFill_Style,
};
#define FOR_SETUP(index, array, setter) \
for (size_t index = 0; index < SK_ARRAY_COUNT(array); ++index) { \
paint.setter(array[index]); \
SkPaint paint;
paint.setFlags(0x1234);
FOR_SETUP(i, levels, setFilterQuality)
FOR_SETUP(j, hinting, setHinting)
FOR_SETUP(l, caps, setStrokeCap)
FOR_SETUP(m, joins, setStrokeJoin)
FOR_SETUP(n, encodings, setTextEncoding)
FOR_SETUP(p, styles, setStyle)
SkBinaryWriteBuffer writer;
SkPaintPriv::Flatten(paint, writer);
SkAutoMalloc buf(writer.bytesWritten());
writer.writeToMemory(buf.get());
SkReadBuffer reader(buf.get(), writer.bytesWritten());
SkPaint paint2;
SkPaintPriv::Unflatten(&paint2, reader);
REPORTER_ASSERT(reporter, paint2 == paint);
}}}}}}
#undef FOR_SETUP
}
// found and fixed for android: not initializing rect for string's of length 0
DEF_TEST(Paint_regression_measureText, reporter) {
SkFont font;
font.setSize(12.0f);
SkRect r;
r.setLTRB(SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN, SK_ScalarNaN);
// test that the rect was reset
font.measureText("", 0, kUTF8_SkTextEncoding, &r);
REPORTER_ASSERT(reporter, r.isEmpty());
}
#define ASSERT(expr) REPORTER_ASSERT(r, expr)
DEF_TEST(Paint_MoreFlattening, r) {
SkPaint paint;
paint.setColor(0x00AABBCC);
paint.setTextScaleX(1.0f); // Default value, ignored.
paint.setTextSize(19);
paint.setBlendMode(SkBlendMode::kModulate);
paint.setLooper(nullptr); // Default value, ignored.
SkBinaryWriteBuffer writer;
SkPaintPriv::Flatten(paint, writer);
SkAutoMalloc buf(writer.bytesWritten());
writer.writeToMemory(buf.get());
SkReadBuffer reader(buf.get(), writer.bytesWritten());
SkPaint other;
SkPaintPriv::Unflatten(&other, reader);
ASSERT(reader.offset() == writer.bytesWritten());
// No matter the encoding, these must always hold.
ASSERT(other.getColor() == paint.getColor());
ASSERT(other.getTextScaleX() == paint.getTextScaleX());
ASSERT(other.getTextSize() == paint.getTextSize());
ASSERT(other.getLooper() == paint.getLooper());
ASSERT(other.getBlendMode() == paint.getBlendMode());
}
DEF_TEST(Paint_getHash, r) {
// Try not to inspect the actual hash values in here.
// We might want to change the hash function.
SkPaint paint;
const uint32_t defaultHash = paint.getHash();
// Check that some arbitrary field affects the hash.
paint.setColor(0xFF00FF00);
REPORTER_ASSERT(r, paint.getHash() != defaultHash);
paint.setColor(SK_ColorBLACK); // Reset to default value.
REPORTER_ASSERT(r, paint.getHash() == defaultHash);
// SkTypeface is the first field we hash, so test it specially.
paint.setTypeface(SkTypeface::MakeDefault());
REPORTER_ASSERT(r, paint.getHash() != defaultHash);
paint.setTypeface(nullptr);
REPORTER_ASSERT(r, paint.getHash() == defaultHash);
// This is part of fBitfields, the last field we hash.
paint.setHinting(kSlight_SkFontHinting);
REPORTER_ASSERT(r, paint.getHash() != defaultHash);
paint.setHinting(kNormal_SkFontHinting);
REPORTER_ASSERT(r, paint.getHash() == defaultHash);
}
#include "SkColorMatrixFilter.h"
DEF_TEST(Paint_nothingToDraw, r) {
SkPaint paint;
REPORTER_ASSERT(r, !paint.nothingToDraw());
paint.setAlpha(0);
REPORTER_ASSERT(r, paint.nothingToDraw());
paint.setAlpha(0xFF);
paint.setBlendMode(SkBlendMode::kDst);
REPORTER_ASSERT(r, paint.nothingToDraw());
paint.setAlpha(0);
paint.setBlendMode(SkBlendMode::kSrcOver);
SkColorMatrix cm;
cm.setIdentity(); // does not change alpha
paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(cm.fMat));
REPORTER_ASSERT(r, paint.nothingToDraw());
cm.postTranslate(0, 0, 0, 1); // wacks alpha
paint.setColorFilter(SkColorFilter::MakeMatrixFilterRowMajor255(cm.fMat));
REPORTER_ASSERT(r, !paint.nothingToDraw());
}
#ifdef SK_SUPPORT_LEGACY_PAINT_TEXTMEASURE
DEF_TEST(Paint_getwidths, r) {
SkPaint paint;
const char text[] = "Hamburgefons!@#!#23425,./;'[]";
int count = paint.countText(text, strlen(text));
SkAutoTArray<uint16_t> glyphStorage(count * 2);
uint16_t* glyphs = glyphStorage.get();
(void)paint.textToGlyphs(text, strlen(text), glyphs);
paint.setTextEncoding(kGlyphID_SkTextEncoding);
SkAutoTArray<SkScalar> widthStorage(count * 2);
SkScalar* widths = widthStorage.get();
SkAutoTArray<SkRect> rectStorage(count * 2);
SkRect* bounds = rectStorage.get();
for (bool subpix : { false, true }) {
paint.setSubpixelText(subpix);
for (auto hint : { kNo_SkFontHinting, kSlight_SkFontHinting, kNormal_SkFontHinting, kFull_SkFontHinting}) {
paint.setHinting(hint);
for (auto size : { 1.0f, 12.0f, 100.0f }) {
paint.setTextSize(size);
paint.getTextWidths(glyphs, count * 2, widths, bounds);
SkFont font = SkFont::LEGACY_ExtractFromPaint(paint);
font.getWidths(glyphs, count, widths + count, bounds + count);
for (int i = 0; i < count; ++i) {
REPORTER_ASSERT(r, widths[i] == widths[i + count]);
REPORTER_ASSERT(r, bounds[i] == bounds[i + count]);
}
}
}
}
}
#endif
DEF_TEST(Font_getpos, r) {
SkFont font;
const char text[] = "Hamburgefons!@#!#23425,./;'[]";
int count = font.countText(text, strlen(text), kUTF8_SkTextEncoding);
SkAutoTArray<uint16_t> glyphStorage(count);
uint16_t* glyphs = glyphStorage.get();
(void)font.textToGlyphs(text, strlen(text), kUTF8_SkTextEncoding, glyphs, count);
SkAutoTArray<SkScalar> widthStorage(count);
SkAutoTArray<SkScalar> xposStorage(count);
SkAutoTArray<SkPoint> posStorage(count);
SkScalar* widths = widthStorage.get();
SkScalar* xpos = xposStorage.get();
SkPoint* pos = posStorage.get();
for (bool subpix : { false, true }) {
font.setSubpixel(subpix);
for (auto hint : { kNo_SkFontHinting, kSlight_SkFontHinting, kNormal_SkFontHinting, kFull_SkFontHinting}) {
font.setHinting(hint);
for (auto size : { 1.0f, 12.0f, 100.0f }) {
font.setSize(size);
font.getWidths(glyphs, count, widths);
font.getXPos(glyphs, count, xpos, 10);
font.getPos(glyphs, count, pos, {10, 20});
auto nearly_eq = [](SkScalar a, SkScalar b) {
return SkScalarAbs(a - b) < 0.000001f;
};
SkScalar x = 10;
for (int i = 0; i < count; ++i) {
REPORTER_ASSERT(r, nearly_eq(x, xpos[i]));
REPORTER_ASSERT(r, nearly_eq(x, pos[i].fX));
REPORTER_ASSERT(r, nearly_eq(20, pos[i].fY));
x += widths[i];
}
}
}
}
}
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