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skia2/gm/typeface.cpp
Ben Wagner 8477dd24c8 Fix typeface GMs to draw or skip 
Before this change the typeface_styling GM would draw an empty canvas if
the default SkFontMgr could not load a 'ttf' font. Instead of drawing
nothing, attempt to draw an 'A' in the default available font.

Before this change the typeface_rendering GMs would draw an empty canvas
if the default SkFontMgr could not load a 'ttf' font. Instea of drawing
nothing, skip the test instead.

Change-Id: I15b3c5aae7ac0d2e8f0291456a84291768b009a0
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/438276
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Ben Wagner <bungeman@google.com>
2021-08-10 21:36:55 +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 "gm/gm.h"
#include "include/core/SkBlurTypes.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkFont.h"
#include "include/core/SkFontStyle.h"
#include "include/core/SkFontTypes.h"
#include "include/core/SkMaskFilter.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkScalar.h"
#include "include/core/SkSize.h"
#include "include/core/SkString.h"
#include "include/core/SkTextBlob.h"
#include "include/core/SkTypeface.h"
#include "include/core/SkTypes.h"
#include "include/private/SkTemplates.h"
#include "tools/Resources.h"
#include <string.h>
#include <utility>
static void getGlyphPositions(const SkFont& font, const uint16_t glyphs[],
int count, SkScalar x, SkScalar y, SkPoint pos[]) {
SkAutoSTMalloc<128, SkScalar> widthStorage(count);
SkScalar* widths = widthStorage.get();
font.getWidths(glyphs, count, widths);
for (int i = 0; i < count; ++i) {
pos[i].set(x, y);
x += widths[i];
}
}
static void applyKerning(SkPoint pos[], const int32_t adjustments[], int count,
const SkFont& font) {
SkScalar scale = font.getSize() / font.getTypefaceOrDefault()->getUnitsPerEm();
SkScalar globalAdj = 0;
for (int i = 0; i < count - 1; ++i) {
globalAdj += adjustments[i] * scale;
pos[i + 1].fX += globalAdj;
}
}
static void drawKernText(SkCanvas* canvas, const void* text, size_t len,
SkScalar x, SkScalar y, const SkFont& font, const SkPaint& paint) {
SkTypeface* face = font.getTypefaceOrDefault();
if (!face) {
canvas->drawSimpleText(text, len, SkTextEncoding::kUTF8, x, y, font, paint);
return;
}
SkAutoSTMalloc<128, uint16_t> glyphStorage(len);
uint16_t* glyphs = glyphStorage.get();
int glyphCount = font.textToGlyphs(text, len, SkTextEncoding::kUTF8, glyphs, len);
if (glyphCount < 1) {
return;
}
SkAutoSTMalloc<128, int32_t> adjustmentStorage(glyphCount - 1);
int32_t* adjustments = adjustmentStorage.get();
if (!face->getKerningPairAdjustments(glyphs, glyphCount, adjustments)) {
canvas->drawSimpleText(text, len, SkTextEncoding::kUTF8, x, y, font, paint);
return;
}
SkTextBlobBuilder builder;
auto rec = builder.allocRunPos(font, glyphCount);
memcpy(rec.glyphs, glyphs, glyphCount * sizeof(SkGlyphID));
getGlyphPositions(font, glyphs, glyphCount, x, y, rec.points());
applyKerning(rec.points(), adjustments, glyphCount, font);
canvas->drawTextBlob(builder.make(), 0, 0, paint);
}
static constexpr SkFontStyle gStyles[] = {
SkFontStyle::Normal(),
SkFontStyle::Bold(),
SkFontStyle::Italic(),
SkFontStyle::BoldItalic(),
};
constexpr int gStylesCount = SK_ARRAY_COUNT(gStyles);
class TypefaceStylesGM : public skiagm::GM {
sk_sp<SkTypeface> fFaces[gStylesCount];
bool fApplyKerning;
public:
TypefaceStylesGM(bool applyKerning) : fApplyKerning(applyKerning) {}
protected:
void onOnceBeforeDraw() override {
for (int i = 0; i < gStylesCount; i++) {
fFaces[i] = SkTypeface::MakeFromName(nullptr, gStyles[i]);
}
}
SkString onShortName() override {
SkString name("typefacestyles");
if (fApplyKerning) {
name.append("_kerning");
}
return name;
}
SkISize onISize() override {
return SkISize::Make(640, 480);
}
void onDraw(SkCanvas* canvas) override {
SkFont font;
font.setSize(30);
const char* text = fApplyKerning ? "Type AWAY" : "Hamburgefons";
const size_t textLen = strlen(text);
SkScalar x = SkIntToScalar(10);
SkScalar dy = font.getMetrics(nullptr);
SkScalar y = dy;
if (fApplyKerning) {
font.setSubpixel(true);
} else {
font.setLinearMetrics(true);
}
SkPaint paint;
for (int i = 0; i < gStylesCount; i++) {
font.setTypeface(fFaces[i]);
canvas->drawSimpleText(text, textLen, SkTextEncoding::kUTF8, x, y, font, paint);
if (fApplyKerning) {
drawKernText(canvas, text, textLen, x + 240, y, font, paint);
}
y += dy;
}
}
private:
using INHERITED = skiagm::GM;
};
DEF_GM( return new TypefaceStylesGM(false); )
DEF_GM( return new TypefaceStylesGM(true); )
////////////////////////////////////////////////////////////////////////////////
static void draw_typeface_rendering_gm(SkCanvas* canvas, sk_sp<SkTypeface> face, SkGlyphID glyph) {
struct AliasType {
SkFont::Edging edging;
bool inLayer;
} constexpr aliasTypes[] {
#ifndef SK_BUILD_FOR_IOS
// This gm crashes on iOS when drawing an embedded bitmap when requesting aliased rendering.
// The crash looks like
// libTrueTypeScaler.dylib`<redacted> + 80
// stop reason = EXC_BAD_ACCESS (code=EXC_ARM_DA_ALIGN, address=...)
// -> 0x330b19d0 <+80>: strd r2, r3, [r5, #36]
// 0x330b19d4 <+84>: movs r3, #0x0
// 0x330b19d6 <+86>: add r2, sp, #0x28
// 0x330b19d8 <+88>: ldr r0, [r4, #0x4]
// Disable testing embedded bitmaps on iOS for now.
// See https://bug.skia.org/5530 .
{ SkFont::Edging::kAlias , false },
#endif
{ SkFont::Edging::kAntiAlias , false },
{ SkFont::Edging::kSubpixelAntiAlias, false },
{ SkFont::Edging::kAntiAlias , true },
{ SkFont::Edging::kSubpixelAntiAlias, true },
};
// The hintgasp.ttf is designed for the following sizes to be different.
// GASP_DOGRAY 0x0002 0<=ppem<=10
// GASP_SYMMETRIC_SMOOTHING 0x0008 0<=ppem<=10
// GASP_GRIDFIT 0x0001 11<=ppem<=12
// GASP_SYMMETRIC_GRIDFIT 0x0004 11<=ppem<=12
// GASP_DOGRAY|GASP_GRIDFIT 0x0003 13<=ppem<=14
// GASP_SYMMETRIC_SMOOTHING|GASP_SYMMETRIC_GRIDFIT 0x000C 13<=ppem<=14
// (neither) 0x0000 15<=ppem
// Odd sizes have embedded bitmaps.
constexpr SkScalar textSizes[] = { 9, 10, 11, 12, 13, 14, 15, 16 };
constexpr SkFontHinting hintingTypes[] = {
SkFontHinting::kNone,
SkFontHinting::kSlight,
SkFontHinting::kNormal,
SkFontHinting::kFull
};
struct SubpixelType {
bool requested;
SkVector offset;
} constexpr subpixelTypes[] = {
{ false, { 0.00, 0.00 } },
{ true , { 0.00, 0.00 } },
{ true , { 0.25, 0.00 } },
{ true , { 0.25, 0.25 } },
};
constexpr bool rotateABitTypes[] = { false, true };
SkScalar y = 0; // The baseline of the previous output
{
SkPaint paint;
SkFont font(face);
font.setEmbeddedBitmaps(true);
SkScalar x = 0;
SkScalar xMax = x;
SkScalar xBase = 0;
for (const SubpixelType subpixel : subpixelTypes) {
y = 0;
font.setSubpixel(subpixel.requested);
for (const AliasType& alias : aliasTypes) {
font.setEdging(alias.edging);
SkAutoCanvasRestore acr1(canvas, false);
if (alias.inLayer) {
canvas->saveLayer(nullptr, &paint);
}
for (const SkScalar& textSize : textSizes) {
x = xBase + 5;
font.setSize(textSize);
SkScalar dy = SkScalarCeilToScalar(font.getMetrics(nullptr));
y += dy;
for (const SkFontHinting& hinting : hintingTypes) {
font.setHinting(hinting);
for (const bool& rotateABit : rotateABitTypes) {
SkAutoCanvasRestore acr2(canvas, true);
if (rotateABit) {
canvas->rotate(2, x + subpixel.offset.x(),
y + subpixel.offset.y());
}
canvas->drawSimpleText(&glyph, sizeof(glyph), SkTextEncoding::kGlyphID,
x + subpixel.offset.x(),
y + subpixel.offset.y(), font, paint);
SkScalar dx = SkScalarCeilToScalar(font.measureText(
&glyph, sizeof(glyph), SkTextEncoding::kGlyphID)) + 5;
x += dx;
xMax = std::max(x, xMax);
}
}
}
y += 10;
}
xBase = xMax;
}
}
constexpr struct StyleTests {
SkPaint::Style style;
SkScalar strokeWidth;
} styleTypes[] = {
{ SkPaint::kFill_Style, 0.0f},
{ SkPaint::kStroke_Style, 0.0f},
{ SkPaint::kStroke_Style, 0.5f},
{ SkPaint::kStrokeAndFill_Style, 1.0f},
};
constexpr bool fakeBoldTypes[] = { false, true };
{
SkPaint paint;
SkFont font(face, 16);
SkScalar x = 0;
for (const bool& fakeBold : fakeBoldTypes) {
SkScalar dy = SkScalarCeilToScalar(font.getMetrics(nullptr));
y += dy;
x = 5;
font.setEmbolden(fakeBold);
for (const AliasType& alias : aliasTypes) {
font.setEdging(alias.edging);
SkAutoCanvasRestore acr(canvas, false);
if (alias.inLayer) {
canvas->saveLayer(nullptr, &paint);
}
for (const StyleTests& style : styleTypes) {
paint.setStyle(style.style);
paint.setStrokeWidth(style.strokeWidth);
canvas->drawSimpleText(&glyph, sizeof(glyph), SkTextEncoding::kGlyphID,
x, y, font, paint);
SkScalar dx = SkScalarCeilToScalar(font.measureText(
&glyph, sizeof(glyph), SkTextEncoding::kGlyphID)) + 5;
x += dx;
}
}
y += 10;
}
}
constexpr struct MaskTests {
SkBlurStyle style;
SkScalar sigma;
} maskTypes[] = {
{ SkBlurStyle::kNormal_SkBlurStyle, 0.0f},
{ SkBlurStyle::kSolid_SkBlurStyle, 0.0f},
{ SkBlurStyle::kOuter_SkBlurStyle, 0.0f},
{ SkBlurStyle::kInner_SkBlurStyle, 0.0f},
{ SkBlurStyle::kNormal_SkBlurStyle, 0.5f},
{ SkBlurStyle::kSolid_SkBlurStyle, 0.5f},
{ SkBlurStyle::kOuter_SkBlurStyle, 0.5f},
{ SkBlurStyle::kInner_SkBlurStyle, 0.5f},
{ SkBlurStyle::kNormal_SkBlurStyle, 2.0f},
{ SkBlurStyle::kSolid_SkBlurStyle, 2.0f},
{ SkBlurStyle::kOuter_SkBlurStyle, 2.0f},
{ SkBlurStyle::kInner_SkBlurStyle, 2.0f},
};
{
SkPaint paint;
SkFont font(face, 16);
SkScalar x = 0;
{
for (const AliasType& alias : aliasTypes) {
SkScalar dy = SkScalarCeilToScalar(font.getMetrics(nullptr));
y += dy;
x = 5;
font.setEdging(alias.edging);
SkAutoCanvasRestore acr(canvas, false);
if (alias.inLayer) {
canvas->saveLayer(nullptr, &paint);
}
for (const MaskTests& mask : maskTypes) {
paint.setMaskFilter(SkMaskFilter::MakeBlur(mask.style, mask.sigma));
canvas->drawSimpleText(&glyph, sizeof(glyph), SkTextEncoding::kGlyphID,
x, y, font, paint);
SkScalar dx = SkScalarCeilToScalar(font.measureText(
&glyph, sizeof(glyph), SkTextEncoding::kGlyphID)) + 5;
x += dx;
}
paint.setMaskFilter(nullptr);
}
y += 10;
}
}
}
DEF_SIMPLE_GM_CAN_FAIL(typefacerendering, canvas, errMsg, 640, 840) {
sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/hintgasp.ttf");
if (!face) {
return skiagm::DrawResult::kSkip;
}
draw_typeface_rendering_gm(canvas, face, face->unicharToGlyph('A'));
// Should draw nothing and not do anything undefined.
draw_typeface_rendering_gm(canvas, face, 0xFFFF);
return skiagm::DrawResult::kOk;
}
// Type1 fonts don't currently work in Skia on Windows.
#ifndef SK_BUILD_FOR_WIN
DEF_SIMPLE_GM_CAN_FAIL(typefacerendering_pfa, canvas, errMsg, 640, 840) {
sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/Roboto2-Regular.pfa");
if (!face) {
return skiagm::DrawResult::kSkip;
}
draw_typeface_rendering_gm(canvas, face, face->unicharToGlyph('O'));
return skiagm::DrawResult::kOk;
}
DEF_SIMPLE_GM_CAN_FAIL(typefacerendering_pfb, canvas, errMsg, 640, 840) {
sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/Roboto2-Regular.pfb");
if (!face) {
return skiagm::DrawResult::kSkip;
}
draw_typeface_rendering_gm(canvas, face, face->unicharToGlyph('O'));
return skiagm::DrawResult::kOk;
}
#endif
////////////////////////////////////////////////////////////////////////////////
#include "include/effects/SkStrokeAndFillPathEffect.h"
// Exercise different paint styles and embolden, and compare with strokeandfill patheffect
DEF_SIMPLE_GM(typeface_styling, canvas, 710, 360) {
sk_sp<SkTypeface> face = MakeResourceAsTypeface("fonts/Roboto-Regular.ttf");
SkFont font;
font.setTypeface(face);
font.setSize(100);
font.setEdging(SkFont::Edging::kAntiAlias);
uint16_t glyphs[1] = { font.unicharToGlyph('A') };
SkPoint pos[1] = { {0, 0} };
auto draw = [&](SkPaint::Style style, float width, sk_sp<SkPathEffect> pe) {
// Draws 3 rows:
// 1. normal
// 2. emboldened
// 3. normal(white) on top of emboldened (to show the delta)
SkPaint paint;
paint.setStyle(style);
paint.setStrokeWidth(width);
paint.setPathEffect(pe);
font.setEmbolden(true);
canvas->drawGlyphs(1, glyphs, pos, {20, 120*2}, font, paint);
canvas->drawGlyphs(1, glyphs, pos, {20, 120*3}, font, paint);
font.setEmbolden(false);
canvas->drawGlyphs(1, glyphs, pos, {20, 120*1}, font, paint);
paint.setColor(SK_ColorYELLOW);
canvas->drawGlyphs(1, glyphs, pos, {20, 120*3}, font, paint);
};
const struct {
SkPaint::Style style;
float width;
bool usePE;
} recs[] = {
{ SkPaint::kFill_Style, 0, false },
{ SkPaint::kStroke_Style, 0, false },
{ SkPaint::kStroke_Style, 3, false },
{ SkPaint::kStrokeAndFill_Style, 0, false },
{ SkPaint::kStrokeAndFill_Style, 3, false },
{ SkPaint::kStroke_Style, 0, true },
{ SkPaint::kStroke_Style, 3, true },
};
canvas->translate(0, -20);
auto pe = SkStrokeAndFillPathEffect::Make();
for (auto r : recs) {
draw(r.style, r.width, r.usePE ? pe : nullptr);
canvas->translate(100, 0);
}
}
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