зеркало из https://github.com/mozilla/moz-skia.git
136 строки
3.6 KiB
C++
136 строки
3.6 KiB
C++
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/*
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* Copyright 2011 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "SampleCode.h"
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#include "SkView.h"
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#include "SkCanvas.h"
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#include "SkTypeface.h"
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#include "SkPath.h"
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#include "SkRegion.h"
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#include "SkShader.h"
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#include "SkUtils.h"
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#include "Sk1DPathEffect.h"
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#include "SkCornerPathEffect.h"
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#include "SkPathMeasure.h"
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#include "SkRandom.h"
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#include "SkColorPriv.h"
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#include "SkColorFilter.h"
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#include "SkDither.h"
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#include "SkTypefaceCache.h"
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static int dither_4444(int x) {
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return ((x << 1) - ((x >> 4 << 4) | (x >> 4))) >> 4;
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}
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/** Ensure that the max of the original and dithered value (for alpha) is always
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>= any other dithered value. We apply this "max" in colorpriv.h when we
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predither down to 4444, to be sure that we stay in legal premultiplied form
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*/
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static void test_4444_dither() {
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int buckets[16];
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sk_bzero(buckets, sizeof(buckets));
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for (int a = 0; a <= 0xFF; a++) {
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int da = dither_4444(a);
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int maxa = SkMax32(a >> 4, da);
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// SkDebugf("--- %02X %X\n", a, da);
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buckets[da] += 1;
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for (int c = 0; c <= a; c++) {
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int dc = dither_4444(c);
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if (maxa < dc) {
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SkDebugf("------------ error a=%d da=%d c=%d dc=%d\n", a, da,
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c, dc);
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}
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}
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}
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for (int i = 0; i < 16; i++) {
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// SkDebugf("[%d] = %d\n", i, buckets[i]);
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}
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}
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static const struct {
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const char* fName;
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SkTypeface::Style fStyle;
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} gFaces[] = {
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{ "sans-serif", SkTypeface::kNormal },
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{ "sans-serif", SkTypeface::kBold },
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{ "sans-serif", SkTypeface::kItalic },
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{ "sans-serif", SkTypeface::kBoldItalic },
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{ "serif", SkTypeface::kNormal },
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{ "serif", SkTypeface::kBold },
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{ "serif", SkTypeface::kItalic },
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{ "serif", SkTypeface::kBoldItalic },
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{ "monospace", SkTypeface::kNormal },
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{ "monospace", SkTypeface::kBold },
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{ "monospace", SkTypeface::kItalic },
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{ "monospace", SkTypeface::kBoldItalic },
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};
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static const int gFaceCount = SK_ARRAY_COUNT(gFaces);
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class TypefaceView : public SampleView {
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SkTypeface* fFaces[gFaceCount];
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public:
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TypefaceView() {
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test_4444_dither();
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for (int i = 0; i < gFaceCount; i++) {
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fFaces[i] = SkTypeface::CreateFromName(gFaces[i].fName,
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gFaces[i].fStyle);
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}
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this->setBGColor(0xFFDDDDDD);
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}
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virtual ~TypefaceView() {
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for (int i = 0; i < gFaceCount; i++) {
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SkSafeUnref(fFaces[i]);
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}
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SkTypefaceCache::Dump();
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}
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protected:
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// overrides from SkEventSink
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virtual bool onQuery(SkEvent* evt) {
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if (SampleCode::TitleQ(*evt)) {
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SampleCode::TitleR(evt, "Typefaces");
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return true;
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}
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return this->INHERITED::onQuery(evt);
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}
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virtual void onDrawContent(SkCanvas* canvas) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setTextSize(SkIntToScalar(30));
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const char* text = "Hamburgefons";
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const size_t textLen = strlen(text);
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SkScalar x = SkIntToScalar(10);
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SkScalar dy = paint.getFontMetrics(NULL);
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SkScalar y = dy;
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paint.setLinearText(true);
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for (int i = 0; i < gFaceCount; i++) {
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paint.setTypeface(fFaces[i]);
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canvas->drawText(text, textLen, x, y, paint);
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y += dy;
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}
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}
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private:
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typedef SampleView INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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static SkView* MyFactory() { return new TypefaceView; }
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static SkViewRegister reg(MyFactory);
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