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354 lines
10 KiB
354 lines
10 KiB
/*
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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 "Sample.h"
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#include "SkBitmap.h"
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#include "SkCanvas.h"
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#include "SkFont.h"
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#include "SkFontMetrics.h"
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#include "SkGradientShader.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 "SkUTF.h"
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#include <math.h>
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static void test_strokerect(SkCanvas* canvas) {
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int width = 100;
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int height = 100;
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SkBitmap bitmap;
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bitmap.allocPixels(SkImageInfo::MakeA8(width*2, height*2));
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bitmap.eraseColor(SK_ColorTRANSPARENT);
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SkScalar dx = 20;
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SkScalar dy = 20;
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SkPath path;
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path.addRect(0.0f, 0.0f,
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SkIntToScalar(width), SkIntToScalar(height),
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SkPath::kCW_Direction);
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SkRect r = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
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SkCanvas c(bitmap);
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c.translate(dx, dy);
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setStrokeWidth(1);
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// use the rect
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c.clear(SK_ColorTRANSPARENT);
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c.drawRect(r, paint);
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canvas->drawBitmap(bitmap, 0, 0, nullptr);
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// use the path
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c.clear(SK_ColorTRANSPARENT);
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c.drawPath(path, paint);
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canvas->drawBitmap(bitmap, SkIntToScalar(2*width), 0, nullptr);
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}
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static void drawFadingText(SkCanvas* canvas,
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const char* text, size_t len, SkScalar x, SkScalar y,
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const SkFont& font, const SkPaint& paint) {
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// Need a bounds for the text
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SkRect bounds;
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SkFontMetrics fm;
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font.getMetrics(&fm);
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bounds.set(x, y + fm.fTop, x + font.measureText(text, len, kUTF8_SkTextEncoding), y + fm.fBottom);
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// may need to outset bounds a little, to account for hinting and/or
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// antialiasing
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bounds.inset(-SkIntToScalar(2), -SkIntToScalar(2));
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canvas->saveLayer(&bounds, nullptr);
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canvas->drawSimpleText(text, len, kUTF8_SkTextEncoding, x, y, font, paint);
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const SkPoint pts[] = {
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{ bounds.fLeft, y },
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{ bounds.fRight, y }
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};
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const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
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// pos[1] value is where we start to fade, relative to the width
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// of our pts[] array.
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const SkScalar pos[] = { 0, 0.9f, SK_Scalar1 };
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SkPaint p;
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p.setShader(SkGradientShader::MakeLinear(pts, colors, pos, 3, SkShader::kClamp_TileMode));
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p.setBlendMode(SkBlendMode::kDstIn);
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canvas->drawRect(bounds, p);
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canvas->restore();
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}
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static void test_text(SkCanvas* canvas) {
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SkPaint paint;
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paint.setAntiAlias(true);
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SkFont font;
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font.setSize(20);
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const char* str = "Hamburgefons";
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size_t len = strlen(str);
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SkScalar x = 20;
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SkScalar y = 20;
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canvas->drawSimpleText(str, len, kUTF8_SkTextEncoding, x, y, font, paint);
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y += 20;
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const SkPoint pts[] = { { x, y }, { x + font.measureText(str, len, kUTF8_SkTextEncoding), y } };
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const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
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const SkScalar pos[] = { 0, 0.9f, 1 };
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paint.setShader(SkGradientShader::MakeLinear(pts, colors, pos,
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SK_ARRAY_COUNT(colors),
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SkShader::kClamp_TileMode));
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canvas->drawSimpleText(str, len, kUTF8_SkTextEncoding, x, y, font, paint);
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y += 20;
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paint.setShader(nullptr);
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drawFadingText(canvas, str, len, x, y, font, paint);
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}
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static void scale_rect(SkIRect* dst, const SkIRect& src, float scale) {
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dst->fLeft = (int)::roundf(src.fLeft * scale);
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dst->fTop = (int)::roundf(src.fTop * scale);
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dst->fRight = (int)::roundf(src.fRight * scale);
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dst->fBottom = (int)::roundf(src.fBottom * scale);
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}
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static void scale_rgn(SkRegion* dst, const SkRegion& src, float scale) {
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SkRegion tmp;
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SkRegion::Iterator iter(src);
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for (; !iter.done(); iter.next()) {
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SkIRect r;
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scale_rect(&r, iter.rect(), scale);
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tmp.op(r, SkRegion::kUnion_Op);
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}
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dst->swap(tmp);
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}
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static void paint_rgn(SkCanvas* canvas, const SkRegion& rgn,
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const SkPaint& paint) {
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SkRegion scaled;
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scale_rgn(&scaled, rgn, 0.5f);
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SkRegion::Iterator iter(rgn);
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for (; !iter.done(); iter.next())
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{
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SkRect r;
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r.set(iter.rect());
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canvas->drawRect(r, paint);
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}
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}
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class RegionView : public Sample {
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public:
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RegionView() {
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fBase.set(100, 100, 150, 150);
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fRect = fBase;
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fRect.inset(5, 5);
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fRect.offset(25, 25);
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this->setBGColor(0xFFDDDDDD);
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}
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void build_base_rgn(SkRegion* rgn) {
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rgn->setRect(fBase);
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SkIRect r = fBase;
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r.offset(75, 20);
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rgn->op(r, SkRegion::kUnion_Op);
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}
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void build_rgn(SkRegion* rgn, SkRegion::Op op) {
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build_base_rgn(rgn);
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rgn->op(fRect, op);
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}
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protected:
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bool onQuery(Sample::Event* evt) override {
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if (Sample::TitleQ(*evt)) {
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Sample::TitleR(evt, "Regions");
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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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static void drawstr(SkCanvas* canvas, const char text[], const SkPoint& loc,
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bool hilite) {
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SkPaint paint;
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paint.setColor(hilite ? SK_ColorRED : 0x40FF0000);
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SkFont font;
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font.setSize(SkIntToScalar(20));
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canvas->drawSimpleText(text, strlen(text), kUTF8_SkTextEncoding, loc.fX, loc.fY, font, paint);
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}
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void drawPredicates(SkCanvas* canvas, const SkPoint pts[]) {
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SkRegion rgn;
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build_base_rgn(&rgn);
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drawstr(canvas, "Intersects", pts[0], rgn.intersects(fRect));
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drawstr(canvas, "Contains", pts[1], rgn.contains(fRect));
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}
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void drawOrig(SkCanvas* canvas, bool bg) {
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SkRect r;
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SkPaint paint;
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paint.setStyle(SkPaint::kStroke_Style);
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if (bg)
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paint.setColor(0xFFBBBBBB);
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SkRegion rgn;
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build_base_rgn(&rgn);
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paint_rgn(canvas, rgn, paint);
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r.set(fRect);
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canvas->drawRect(r, paint);
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}
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void drawRgnOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
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SkRegion rgn;
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this->build_rgn(&rgn, op);
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{
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SkRegion tmp, tmp2(rgn);
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tmp = tmp2;
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tmp.translate(5, -3);
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{
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char buffer[1000];
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SkDEBUGCODE(size_t size = ) tmp.writeToMemory(nullptr);
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SkASSERT(size <= sizeof(buffer));
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SkDEBUGCODE(size_t size2 = ) tmp.writeToMemory(buffer);
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SkASSERT(size == size2);
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SkRegion tmp3;
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SkDEBUGCODE(size2 = ) tmp3.readFromMemory(buffer, 1000);
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SkASSERT(size == size2);
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SkASSERT(tmp3 == tmp);
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}
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rgn.translate(20, 30, &tmp);
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SkASSERT(rgn.isEmpty() || tmp != rgn);
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tmp.translate(-20, -30);
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SkASSERT(tmp == rgn);
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}
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this->drawOrig(canvas, true);
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SkPaint paint;
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paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
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paint_rgn(canvas, rgn, paint);
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paint.setStyle(SkPaint::kStroke_Style);
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paint.setColor(color);
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paint_rgn(canvas, rgn, paint);
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}
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void drawPathOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
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SkRegion rgn;
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SkPath path;
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this->build_rgn(&rgn, op);
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rgn.getBoundaryPath(&path);
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this->drawOrig(canvas, true);
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SkPaint paint;
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paint.setStyle(SkPaint::kFill_Style);
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paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
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canvas->drawPath(path, paint);
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paint.setColor(color);
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paint.setStyle(SkPaint::kStroke_Style);
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canvas->drawPath(path, paint);
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}
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void onDrawContent(SkCanvas* canvas) override {
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if (false) { // avoid bit rot, suppress warning
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test_strokerect(canvas);
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return;
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}
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if (false) { // avoid bit rot, suppress warning
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test_text(canvas);
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return;
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}
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const SkPoint origins[] = {
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{ 30*SK_Scalar1, 50*SK_Scalar1 },
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{ 150*SK_Scalar1, 50*SK_Scalar1 },
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};
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this->drawPredicates(canvas, origins);
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static const struct {
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SkColor fColor;
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const char* fName;
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SkRegion::Op fOp;
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} gOps[] = {
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{ SK_ColorBLACK, "Difference", SkRegion::kDifference_Op },
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{ SK_ColorRED, "Intersect", SkRegion::kIntersect_Op },
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{ 0xFF008800, "Union", SkRegion::kUnion_Op },
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{ SK_ColorBLUE, "XOR", SkRegion::kXOR_Op }
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};
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SkFont font;
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font.setSize(SK_Scalar1*24);
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this->drawOrig(canvas, false);
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canvas->save();
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canvas->translate(SkIntToScalar(200), 0);
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this->drawRgnOped(canvas, SkRegion::kUnion_Op, SK_ColorBLACK);
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canvas->restore();
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canvas->translate(0, SkIntToScalar(200));
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for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); op++) {
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canvas->drawSimpleText(gOps[op].fName, strlen(gOps[op].fName), kUTF8_SkTextEncoding,
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SkIntToScalar(75), SkIntToScalar(50), font, SkPaint());
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this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);
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canvas->save();
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canvas->translate(0, SkIntToScalar(200));
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this->drawPathOped(canvas, gOps[op].fOp, gOps[op].fColor);
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canvas->restore();
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canvas->translate(SkIntToScalar(200), 0);
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}
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}
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virtual Sample::Click* onFindClickHandler(SkScalar x, SkScalar y,
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unsigned modi) override {
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return fRect.contains(SkScalarRoundToInt(x),
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SkScalarRoundToInt(y)) ? new Click(this) : nullptr;
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}
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bool onClick(Click* click) override {
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fRect.offset(click->fICurr.fX - click->fIPrev.fX,
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click->fICurr.fY - click->fIPrev.fY);
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return true;
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}
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private:
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SkIRect fBase, fRect;
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typedef Sample INHERITED;
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};
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//////////////////////////////////////////////////////////////////////////////
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DEF_SAMPLE( return new RegionView(); )
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