зеркало из https://github.com/mozilla/moz-skia.git
168 строки
4.7 KiB
C++
168 строки
4.7 KiB
C++
#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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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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{ NULL, SkTypeface::kNormal },
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{ NULL, SkTypeface::kBold },
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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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};
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static const int gFaceCount = SK_ARRAY_COUNT(gFaces);
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class TypefaceView : public SkView {
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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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}
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virtual ~TypefaceView() {
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for (int i = 0; i < gFaceCount; i++) {
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fFaces[i]->safeUnref();
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}
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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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void drawBG(SkCanvas* canvas) {
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canvas->drawColor(0xFFDDDDDD);
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}
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virtual void onDraw(SkCanvas* canvas) {
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this->drawBG(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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if (false) {
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(SkIntToScalar(1));
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}
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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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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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SkRect r;
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if (false) {
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r.set(10, 10, 100, 100);
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paint.setStyle(SkPaint::kStrokeAndFill_Style);
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paint.setColor(SK_ColorBLUE);
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paint.setStrokeWidth(1);
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canvas->drawRect(r, paint);
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paint.setStrokeWidth(0);
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}
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if (false) {
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r.set(294912.75f, 294912.75f, 884738.25f, 884738.25f);
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canvas->scale(2.4414E-4f, 2.4414E-4f);
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paint.setStyle(SkPaint::kFill_Style);
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canvas->drawRect(r, paint);
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}
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if (false) {
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SkScalar rad = 90;
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SkScalar angle = 210;
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SkScalar cx = 150;
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SkScalar cy = 105;
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r.set(cx - rad, cy - rad, cx + rad, cy + rad);
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SkPath path;
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path.arcTo(r, angle, -(angle + 90), true);
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path.close();
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paint.setColor(SK_ColorRED);
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canvas->drawRect(path.getBounds(), paint);
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paint.setColor(SK_ColorBLUE);
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canvas->drawPath(path, paint);
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paint.setColor(SK_ColorGREEN);
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SkPoint pts[100];
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int count = path.getPoints(pts, 100);
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paint.setStrokeWidth(5);
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canvas->drawPoints(SkCanvas::kPoints_PointMode, count, pts, paint);
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}
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}
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private:
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typedef SkView 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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