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skia2/tests/FontHostTest.cpp
Ben Wagner 5785e4a165 Use SkFontHinting instead of macros. 
Change-Id: Ie7f231295c27010f53f09e9879aa7df74ab2d09b
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/212507
Auto-Submit: Ben Wagner <bungeman@google.com>
Reviewed-by: Hal Canary <halcanary@skia.org>
Commit-Queue: Ben Wagner <bungeman@google.com>
2019-05-08 12:16:37 +00:00

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/*
* Copyright 2012 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/SkFont.h"
#include "include/core/SkPaint.h"
#include "include/core/SkStream.h"
#include "include/core/SkTypeface.h"
#include "src/core/SkAutoMalloc.h"
#include "src/core/SkEndian.h"
#include "src/core/SkFontStream.h"
#include "src/core/SkOSFile.h"
#include "tests/Test.h"
#include "tools/Resources.h"
//#define DUMP_TABLES
//#define DUMP_TTC_TABLES
#define kFontTableTag_head SkSetFourByteTag('h', 'e', 'a', 'd')
#define kFontTableTag_hhea SkSetFourByteTag('h', 'h', 'e', 'a')
#define kFontTableTag_maxp SkSetFourByteTag('m', 'a', 'x', 'p')
static const struct TagSize {
SkFontTableTag fTag;
size_t fSize;
} gKnownTableSizes[] = {
{ kFontTableTag_head, 54 },
{ kFontTableTag_hhea, 36 },
};
// Test that getUnitsPerEm() agrees with a direct lookup in the 'head' table
// (if that table is available).
static void test_unitsPerEm(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
int nativeUPEM = face->getUnitsPerEm();
int tableUPEM = -1;
size_t size = face->getTableSize(kFontTableTag_head);
if (size) {
// unitsPerEm is at offset 18 into the 'head' table.
uint16_t rawUPEM;
face->getTableData(kFontTableTag_head, 18, sizeof(rawUPEM), &rawUPEM);
tableUPEM = SkEndian_SwapBE16(rawUPEM);
}
if (tableUPEM >= 0) {
REPORTER_ASSERT(reporter, tableUPEM == nativeUPEM);
}
}
// Test that countGlyphs() agrees with a direct lookup in the 'maxp' table
// (if that table is available).
static void test_countGlyphs(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
int nativeGlyphs = face->countGlyphs();
int tableGlyphs = -1;
size_t size = face->getTableSize(kFontTableTag_maxp);
if (size) {
// glyphs is at offset 4 into the 'maxp' table.
uint16_t rawGlyphs;
face->getTableData(kFontTableTag_maxp, 4, sizeof(rawGlyphs), &rawGlyphs);
tableGlyphs = SkEndian_SwapBE16(rawGlyphs);
}
if (tableGlyphs >= 0) {
REPORTER_ASSERT(reporter, tableGlyphs == nativeGlyphs);
}
}
static void test_fontstream(skiatest::Reporter* reporter, SkStream* stream, int ttcIndex) {
int n = SkFontStream::GetTableTags(stream, ttcIndex, nullptr);
SkAutoTArray<SkFontTableTag> array(n);
int n2 = SkFontStream::GetTableTags(stream, ttcIndex, array.get());
REPORTER_ASSERT(reporter, n == n2);
for (int i = 0; i < n; ++i) {
#ifdef DUMP_TTC_TABLES
SkString str;
SkFontTableTag t = array[i];
str.appendUnichar((t >> 24) & 0xFF);
str.appendUnichar((t >> 16) & 0xFF);
str.appendUnichar((t >> 8) & 0xFF);
str.appendUnichar((t >> 0) & 0xFF);
SkDebugf("[%d:%d] '%s'\n", ttcIndex, i, str.c_str());
#endif
size_t size = SkFontStream::GetTableSize(stream, ttcIndex, array[i]);
for (size_t j = 0; j < SK_ARRAY_COUNT(gKnownTableSizes); ++j) {
if (gKnownTableSizes[j].fTag == array[i]) {
REPORTER_ASSERT(reporter, gKnownTableSizes[j].fSize == size);
}
}
}
}
static void test_fontstream(skiatest::Reporter* reporter) {
std::unique_ptr<SkStreamAsset> stream(GetResourceAsStream("fonts/test.ttc"));
if (!stream) {
SkDebugf("Skipping FontHostTest::test_fontstream\n");
return;
}
int count = SkFontStream::CountTTCEntries(stream.get());
#ifdef DUMP_TTC_TABLES
SkDebugf("CountTTCEntries %d\n", count);
#endif
for (int i = 0; i < count; ++i) {
test_fontstream(reporter, stream.get(), i);
}
}
// Exercise this rare cmap format (platform 3, encoding 0)
static void test_symbolfont(skiatest::Reporter* reporter) {
auto tf = MakeResourceAsTypeface("fonts/SpiderSymbol.ttf");
if (tf) {
SkUnichar c = 0xf021;
uint16_t g = SkFont(tf).unicharToGlyph(c);
REPORTER_ASSERT(reporter, g == 3);
} else {
// not all platforms support data fonts, so we just note that failure
SkDebugf("Skipping FontHostTest::test_symbolfont\n");
}
}
static void test_tables(skiatest::Reporter* reporter, const sk_sp<SkTypeface>& face) {
if (false) { // avoid bit rot, suppress warning
SkFontID fontID = face->uniqueID();
REPORTER_ASSERT(reporter, fontID);
}
int count = face->countTables();
SkAutoTMalloc<SkFontTableTag> storage(count);
SkFontTableTag* tags = storage.get();
int count2 = face->getTableTags(tags);
REPORTER_ASSERT(reporter, count2 == count);
for (int i = 0; i < count; ++i) {
size_t size = face->getTableSize(tags[i]);
REPORTER_ASSERT(reporter, size > 0);
#ifdef DUMP_TABLES
char name[5];
name[0] = (tags[i] >> 24) & 0xFF;
name[1] = (tags[i] >> 16) & 0xFF;
name[2] = (tags[i] >> 8) & 0xFF;
name[3] = (tags[i] >> 0) & 0xFF;
name[4] = 0;
SkDebugf("%s %d\n", name, size);
#endif
for (size_t j = 0; j < SK_ARRAY_COUNT(gKnownTableSizes); ++j) {
if (gKnownTableSizes[j].fTag == tags[i]) {
REPORTER_ASSERT(reporter, gKnownTableSizes[j].fSize == size);
}
}
// do we get the same size from GetTableData and GetTableSize
{
SkAutoMalloc data(size);
size_t size2 = face->getTableData(tags[i], 0, size, data.get());
REPORTER_ASSERT(reporter, size2 == size);
}
}
}
static void test_tables(skiatest::Reporter* reporter) {
static const char* const gNames[] = {
nullptr, // default font
"Helvetica", "Arial",
"Times", "Times New Roman",
"Courier", "Courier New",
"Terminal", "MS Sans Serif",
"Hiragino Mincho ProN", "MS PGothic",
};
for (size_t i = 0; i < SK_ARRAY_COUNT(gNames); ++i) {
sk_sp<SkTypeface> face(SkTypeface::MakeFromName(gNames[i], SkFontStyle()));
if (face) {
#ifdef DUMP_TABLES
SkDebugf("%s\n", gNames[i]);
#endif
test_tables(reporter, face);
test_unitsPerEm(reporter, face);
test_countGlyphs(reporter, face);
}
}
}
/*
* Verifies that the advance values returned by generateAdvance and
* generateMetrics match.
*/
static void test_advances(skiatest::Reporter* reporter) {
static const char* const faces[] = {
nullptr, // default font
"Arial", "Times", "Times New Roman", "Helvetica", "Courier",
"Courier New", "Verdana", "monospace",
};
static const struct {
SkFontHinting hinting;
bool linear;
bool subpixel;
} settings[] = {
{ SkFontHinting::kNone, false, false },
{ SkFontHinting::kNone, true, false },
{ SkFontHinting::kNone, false, true },
{ SkFontHinting::kSlight, false, false },
{ SkFontHinting::kSlight, true, false },
{ SkFontHinting::kSlight, false, true },
{ SkFontHinting::kNormal, false, false },
{ SkFontHinting::kNormal, true, false },
{ SkFontHinting::kNormal, false, true },
};
static const struct {
SkScalar fScaleX;
SkScalar fSkewX;
} gScaleRec[] = {
{ SK_Scalar1, 0 },
{ SK_Scalar1/2, 0 },
// these two exercise obliquing (skew)
{ SK_Scalar1, -SK_Scalar1/4 },
{ SK_Scalar1/2, -SK_Scalar1/4 },
};
SkFont font;
char const * const txt = "long.text.with.lots.of.dots.";
size_t textLen = strlen(txt);
for (size_t i = 0; i < SK_ARRAY_COUNT(faces); i++) {
font.setTypeface(SkTypeface::MakeFromName(faces[i], SkFontStyle()));
for (size_t j = 0; j < SK_ARRAY_COUNT(settings); j++) {
font.setHinting(settings[j].hinting);
font.setLinearMetrics(settings[j].linear);
font.setSubpixel(settings[j].subpixel);
for (size_t k = 0; k < SK_ARRAY_COUNT(gScaleRec); ++k) {
font.setScaleX(gScaleRec[k].fScaleX);
font.setSkewX(gScaleRec[k].fSkewX);
SkRect bounds;
// For no hinting and light hinting this should take the
// optimized generateAdvance path.
SkScalar width1 = font.measureText(txt, textLen, SkTextEncoding::kUTF8);
// Requesting the bounds forces a generateMetrics call.
SkScalar width2 = font.measureText(txt, textLen, SkTextEncoding::kUTF8, &bounds);
// SkDebugf("Font: %s, generateAdvance: %f, generateMetrics: %f\n",
// faces[i], SkScalarToFloat(width1), SkScalarToFloat(width2));
REPORTER_ASSERT(reporter, width1 == width2);
}
}
}
}
DEF_TEST(FontHost, reporter) {
test_tables(reporter);
test_fontstream(reporter);
test_advances(reporter);
test_symbolfont(reporter);
}
// need tests for SkStrSearch
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