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skia2/gm/dftext.cpp
Mike Reed 42e7a7ed65 use SkFont for text 
Bug: skia:
Change-Id: I75d4f2b9e6696099ef6b221f420e766cbca8f968
Reviewed-on: https://skia-review.googlesource.com/c/177682
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
2018-12-14 02:50:00 +00:00

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8.3 KiB
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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 "Resources.h"
#include "SkCanvas.h"
#include "SkFont.h"
#include "SkStream.h"
#include "SkSurface.h"
#include "SkTextBlob.h"
#include "SkTo.h"
#include "SkTypeface.h"
#include "gm.h"
#include "sk_tool_utils.h"
class DFTextGM : public skiagm::GM {
public:
DFTextGM() {
this->setBGColor(0xFFFFFFFF);
}
protected:
void onOnceBeforeDraw() override {
fEmojiTypeface = sk_tool_utils::emoji_typeface();
fEmojiText = sk_tool_utils::emoji_sample_text();
}
SkString onShortName() override {
SkString name("dftext");
name.append(sk_tool_utils::platform_font_manager());
return name;
}
SkISize onISize() override {
return SkISize::Make(1024, 768);
}
virtual void onDraw(SkCanvas* inputCanvas) override {
SkScalar textSizes[] = { 9.0f, 9.0f*2.0f, 9.0f*5.0f, 9.0f*2.0f*5.0f };
SkScalar scales[] = { 2.0f*5.0f, 5.0f, 2.0f, 1.0f };
// set up offscreen rendering with distance field text
GrContext* ctx = inputCanvas->getGrContext();
SkISize size = onISize();
SkImageInfo info = SkImageInfo::MakeN32(size.width(), size.height(), kPremul_SkAlphaType,
inputCanvas->imageInfo().refColorSpace());
SkSurfaceProps props(SkSurfaceProps::kUseDeviceIndependentFonts_Flag,
SkSurfaceProps::kLegacyFontHost_InitType);
auto surface(SkSurface::MakeRenderTarget(ctx, SkBudgeted::kNo, info, 0, &props));
SkCanvas* canvas = surface ? surface->getCanvas() : inputCanvas;
// init our new canvas with the old canvas's matrix
canvas->setMatrix(inputCanvas->getTotalMatrix());
// apply global scale to test glyph positioning
canvas->scale(1.05f, 1.05f);
canvas->clear(0xffffffff);
SkPaint paint;
paint.setAntiAlias(true);
SkFont font(sk_tool_utils::create_portable_typeface("serif", SkFontStyle()));
font.setSubpixel(true);
const char* text = "Hamburgefons";
const size_t textLen = strlen(text);
// check scaling up
SkScalar x = SkIntToScalar(0);
SkScalar y = SkIntToScalar(78);
for (size_t i = 0; i < SK_ARRAY_COUNT(textSizes); ++i) {
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(x, y);
canvas->scale(scales[i], scales[i]);
font.setSize(textSizes[i]);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 0, 0, font, paint);
y += font.getMetrics(nullptr)*scales[i];
}
// check rotation
for (size_t i = 0; i < 5; ++i) {
SkScalar rotX = SkIntToScalar(10);
SkScalar rotY = y;
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(SkIntToScalar(10 + i * 200), -80);
canvas->rotate(SkIntToScalar(i * 5), rotX, rotY);
for (int ps = 6; ps <= 32; ps += 3) {
font.setSize(SkIntToScalar(ps));
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, rotX, rotY, font, paint);
rotY += font.getMetrics(nullptr);
}
}
// check scaling down
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
x = SkIntToScalar(680);
y = SkIntToScalar(20);
size_t arraySize = SK_ARRAY_COUNT(textSizes);
for (size_t i = 0; i < arraySize; ++i) {
SkAutoCanvasRestore acr(canvas, true);
canvas->translate(x, y);
SkScalar scaleFactor = SkScalarInvert(scales[arraySize - i - 1]);
canvas->scale(scaleFactor, scaleFactor);
font.setSize(textSizes[i]);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 0, 0, font, paint);
y += font.getMetrics(nullptr)*scaleFactor;
}
// check pos text
{
SkAutoCanvasRestore acr(canvas, true);
canvas->scale(2.0f, 2.0f);
SkAutoTArray<SkGlyphID> glyphs(SkToInt(textLen));
int count = font.textToGlyphs(text, textLen, kUTF8_SkTextEncoding, glyphs.get(), textLen);
SkAutoTArray<SkPoint> pos(count);
font.setSize(textSizes[0]);
font.getPos(glyphs.get(), count, pos.get(), {340, 75});
auto blob = SkTextBlob::MakeFromPosText(glyphs.get(), count * sizeof(SkGlyphID),
pos.get(), font, kGlyphID_SkTextEncoding);
canvas->drawTextBlob(blob, 0, 0, paint);
}
// check gamma-corrected blending
const SkColor fg[] = {
0xFFFFFFFF,
0xFFFFFF00, 0xFFFF00FF, 0xFF00FFFF,
0xFFFF0000, 0xFF00FF00, 0xFF0000FF,
0xFF000000,
};
paint.setColor(0xFFF7F3F7);
SkRect r = SkRect::MakeLTRB(670, 215, 820, 397);
canvas->drawRect(r, paint);
x = SkIntToScalar(680);
y = SkIntToScalar(235);
font.setSize(SkIntToScalar(19));
for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
paint.setColor(fg[i]);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, x, y, font, paint);
y += font.getMetrics(nullptr);
}
paint.setColor(0xFF181C18);
r = SkRect::MakeLTRB(820, 215, 970, 397);
canvas->drawRect(r, paint);
x = SkIntToScalar(830);
y = SkIntToScalar(235);
font.setSize(SkIntToScalar(19));
for (size_t i = 0; i < SK_ARRAY_COUNT(fg); ++i) {
paint.setColor(fg[i]);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, x, y, font, paint);
y += font.getMetrics(nullptr);
}
// check skew
{
font.setEdging(SkFont::Edging::kAntiAlias);
SkAutoCanvasRestore acr(canvas, true);
canvas->skew(0.0f, 0.151515f);
font.setSize(SkIntToScalar(32));
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 745, 70, font, paint);
}
{
font.setEdging(SkFont::Edging::kSubpixelAntiAlias);
SkAutoCanvasRestore acr(canvas, true);
canvas->skew(0.5f, 0.0f);
font.setSize(SkIntToScalar(32));
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 580, 125, font, paint);
}
// check perspective
{
font.setEdging(SkFont::Edging::kAntiAlias);
SkAutoCanvasRestore acr(canvas, true);
SkMatrix persp;
persp.setAll(0.9839f, 0, 0,
0.2246f, 0.6829f, 0,
0.0002352f, -0.0003844f, 1);
canvas->concat(persp);
canvas->translate(1100, -295);
font.setSize(37.5f);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 0, 0, font, paint);
}
{
font.setSubpixel(false);
font.setEdging(SkFont::Edging::kAlias);
SkAutoCanvasRestore acr(canvas, true);
SkMatrix persp;
persp.setAll(0.9839f, 0, 0,
0.2246f, 0.6829f, 0,
0.0002352f, -0.0003844f, 1);
canvas->concat(persp);
canvas->translate(1075, -245);
canvas->scale(375, 375);
font.setSize(0.1f);
canvas->drawSimpleText(text, textLen, kUTF8_SkTextEncoding, 0, 0, font, paint);
}
// check color emoji
if (fEmojiTypeface) {
SkFont emoiFont;
emoiFont.setSubpixel(true);
emoiFont.setTypeface(fEmojiTypeface);
emoiFont.setSize(SkIntToScalar(19));
canvas->drawSimpleText(fEmojiText, strlen(fEmojiText), kUTF8_SkTextEncoding, 670, 90, emoiFont, paint);
}
// render offscreen buffer
if (surface) {
SkAutoCanvasRestore acr(inputCanvas, true);
// since we prepended this matrix already, we blit using identity
inputCanvas->resetMatrix();
inputCanvas->drawImage(surface->makeImageSnapshot().get(), 0, 0, nullptr);
}
}
private:
sk_sp<SkTypeface> fEmojiTypeface;
const char* fEmojiText;
typedef skiagm::GM INHERITED;
};
DEF_GM(return new DFTextGM;)
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