mozilla
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moz-skia
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moz-skia/samplecode/SampleRegion.cpp

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C++
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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 "SampleCode.h"
#include "SkView.h"
#include "SkCanvas.h"
#include "SkGradientShader.h"
#include "SkPath.h"
#include "SkRegion.h"
#include "SkShader.h"
#include "SkUtils.h"
#include "SkImageDecoder.h"
static void test_strokerect(SkCanvas* canvas) {
int width = 100;
int height = 100;
SkBitmap bitmap;
bitmap.setConfig(SkBitmap::kA8_Config, width*2, height*2);
bitmap.allocPixels();
bitmap.eraseColor(0);
SkScalar dx = 20;
SkScalar dy = 20;
SkPath path;
path.addRect(0.0f, 0.0f,
SkIntToScalar(width), SkIntToScalar(height),
SkPath::kCW_Direction);
SkRect r = SkRect::MakeWH(SkIntToScalar(width), SkIntToScalar(height));
SkCanvas c(bitmap);
c.translate(dx, dy);
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
paint.setStrokeWidth(1);
// use the rect
c.clear(0);
c.drawRect(r, paint);
canvas->drawBitmap(bitmap, 0, 0, NULL);
// use the path
c.clear(0);
c.drawPath(path, paint);
canvas->drawBitmap(bitmap, SkIntToScalar(2*width), 0, NULL);
}
static void drawFadingText(SkCanvas* canvas,
const char* text, size_t len, SkScalar x, SkScalar y,
const SkPaint& paint) {
// Need a bounds for the text
SkRect bounds;
SkPaint::FontMetrics fm;
paint.getFontMetrics(&fm);
bounds.set(x, y + fm.fTop, x + paint.measureText(text, len), y + fm.fBottom);
// may need to outset bounds a little, to account for hinting and/or
// antialiasing
bounds.inset(-SkIntToScalar(2), -SkIntToScalar(2));
canvas->saveLayer(&bounds, NULL);
canvas->drawText(text, len, x, y, paint);
const SkPoint pts[] = {
{ bounds.fLeft, y },
{ bounds.fRight, y }
};
const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
// pos[1] value is where we start to fade, relative to the width
// of our pts[] array.
const SkScalar pos[] = { 0, SkFloatToScalar(0.9f), SK_Scalar1 };
SkShader* s = SkGradientShader::CreateLinear(pts, colors, pos, 3,
SkShader::kClamp_TileMode);
SkPaint p;
p.setShader(s)->unref();
p.setXfermodeMode(SkXfermode::kDstIn_Mode);
canvas->drawRect(bounds, p);
canvas->restore();
}
static void test_text(SkCanvas* canvas) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(20);
const char* str = "Hamburgefons";
size_t len = strlen(str);
SkScalar x = 20;
SkScalar y = 20;
canvas->drawText(str, len, x, y, paint);
y += 20;
const SkPoint pts[] = { { x, y }, { x + paint.measureText(str, len), y } };
const SkColor colors[] = { SK_ColorBLACK, SK_ColorBLACK, 0 };
const SkScalar pos[] = { 0, 0.9f, 1 };
SkShader* s = SkGradientShader::CreateLinear(pts, colors, pos,
SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode);
paint.setShader(s)->unref();
canvas->drawText(str, len, x, y, paint);
y += 20;
paint.setShader(NULL);
drawFadingText(canvas, str, len, x, y, paint);
}
#ifdef SK_BUILD_FOR_WIN
// windows doesn't have roundf
inline float roundf(float x) { return (x-floor(x))>0.5 ? ceil(x) : floor(x); }
#endif
#ifdef SK_DEBUG
static void make_rgn(SkRegion* rgn, int left, int top, int right, int bottom,
size_t count, int32_t runs[]) {
SkIRect r;
r.set(left, top, right, bottom);
rgn->debugSetRuns(runs, count);
SkASSERT(rgn->getBounds() == r);
}
static void test_union_bug_1505668(SkRegion* ra, SkRegion* rb, SkRegion* rc) {
static int32_t dataA[] = {
0x00000001,
0x000001dd, 2, 0x00000001, 0x0000000c, 0x0000000d, 0x00000025, 0x7fffffff,
0x000001de, 1, 0x00000001, 0x00000025, 0x7fffffff,
0x000004b3, 1, 0x00000001, 0x00000026, 0x7fffffff,
0x000004b4, 1, 0x0000000c, 0x00000026, 0x7fffffff,
0x00000579, 1, 0x00000000, 0x0000013a, 0x7fffffff,
0x000005d8, 1, 0x00000000, 0x0000013b, 0x7fffffff,
0x7fffffff
};
make_rgn(ra, 0, 1, 315, 1496, SK_ARRAY_COUNT(dataA), dataA);
static int32_t dataB[] = {
0x000000b6,
0x000000c4, 1, 0x000000a1, 0x000000f0, 0x7fffffff,
0x000000d6, 0, 0x7fffffff,
0x000000e4, 2, 0x00000070, 0x00000079, 0x000000a1, 0x000000b0, 0x7fffffff,
0x000000e6, 0, 0x7fffffff,
0x000000f4, 2, 0x00000070, 0x00000079, 0x000000a1, 0x000000b0, 0x7fffffff,
0x000000f6, 0, 0x7fffffff,
0x00000104, 1, 0x000000a1, 0x000000b0, 0x7fffffff,
0x7fffffff
};
make_rgn(rb, 112, 182, 240, 260, SK_ARRAY_COUNT(dataB), dataB);
rc->op(*ra, *rb, SkRegion::kUnion_Op);
}
#endif
static void scale_rect(SkIRect* dst, const SkIRect& src, float scale) {
dst->fLeft = (int)::roundf(src.fLeft * scale);
dst->fTop = (int)::roundf(src.fTop * scale);
dst->fRight = (int)::roundf(src.fRight * scale);
dst->fBottom = (int)::roundf(src.fBottom * scale);
}
static void scale_rgn(SkRegion* dst, const SkRegion& src, float scale) {
SkRegion tmp;
SkRegion::Iterator iter(src);
for (; !iter.done(); iter.next()) {
SkIRect r;
scale_rect(&r, iter.rect(), scale);
tmp.op(r, SkRegion::kUnion_Op);
}
dst->swap(tmp);
}
static void paint_rgn(SkCanvas* canvas, const SkRegion& rgn,
const SkPaint& paint) {
SkRegion scaled;
scale_rgn(&scaled, rgn, 0.5f);
SkRegion::Iterator iter(rgn);
for (; !iter.done(); iter.next())
{
SkRect r;
r.set(iter.rect());
canvas->drawRect(r, paint);
}
}
class RegionView : public SampleView {
public:
RegionView() {
fBase.set(100, 100, 150, 150);
fRect = fBase;
fRect.inset(5, 5);
fRect.offset(25, 25);
this->setBGColor(0xFFDDDDDD);
}
void build_base_rgn(SkRegion* rgn) {
rgn->setRect(fBase);
SkIRect r = fBase;
r.offset(75, 20);
rgn->op(r, SkRegion::kUnion_Op);
}
void build_rgn(SkRegion* rgn, SkRegion::Op op) {
build_base_rgn(rgn);
rgn->op(fRect, op);
}
protected:
// overrides from SkEventSink
virtual bool onQuery(SkEvent* evt) {
if (SampleCode::TitleQ(*evt)) {
SampleCode::TitleR(evt, "Regions");
return true;
}
return this->INHERITED::onQuery(evt);
}
static void drawstr(SkCanvas* canvas, const char text[], const SkPoint& loc,
bool hilite) {
SkPaint paint;
paint.setAntiAlias(true);
paint.setTextSize(SkIntToScalar(20));
paint.setColor(hilite ? SK_ColorRED : 0x40FF0000);
canvas->drawText(text, strlen(text), loc.fX, loc.fY, paint);
}
void drawPredicates(SkCanvas* canvas, const SkPoint pts[]) {
SkRegion rgn;
build_base_rgn(&rgn);
drawstr(canvas, "Intersects", pts[0], rgn.intersects(fRect));
drawstr(canvas, "Contains", pts[1], rgn.contains(fRect));
}
void drawOrig(SkCanvas* canvas, bool bg) {
SkRect r;
SkPaint paint;
paint.setStyle(SkPaint::kStroke_Style);
if (bg)
paint.setColor(0xFFBBBBBB);
SkRegion rgn;
build_base_rgn(&rgn);
paint_rgn(canvas, rgn, paint);
r.set(fRect);
canvas->drawRect(r, paint);
}
void drawRgnOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
SkRegion rgn;
this->build_rgn(&rgn, op);
{
SkRegion tmp, tmp2(rgn);
tmp = tmp2;
tmp.translate(5, -3);
{
char buffer[1000];
size_t size = tmp.writeToMemory(NULL);
SkASSERT(size <= sizeof(buffer));
size_t size2 = tmp.writeToMemory(buffer);
SkASSERT(size == size2);
SkRegion tmp3;
size2 = tmp3.readFromMemory(buffer);
SkASSERT(size == size2);
SkASSERT(tmp3 == tmp);
}
rgn.translate(20, 30, &tmp);
SkASSERT(rgn.isEmpty() || tmp != rgn);
tmp.translate(-20, -30);
SkASSERT(tmp == rgn);
}
this->drawOrig(canvas, true);
SkPaint paint;
paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
paint_rgn(canvas, rgn, paint);
paint.setStyle(SkPaint::kStroke_Style);
paint.setColor(color);
paint_rgn(canvas, rgn, paint);
}
void drawPathOped(SkCanvas* canvas, SkRegion::Op op, SkColor color) {
SkRegion rgn;
SkPath path;
this->build_rgn(&rgn, op);
rgn.getBoundaryPath(&path);
this->drawOrig(canvas, true);
SkPaint paint;
paint.setStyle(SkPaint::kFill_Style);
paint.setColor((color & ~(0xFF << 24)) | (0x44 << 24));
canvas->drawPath(path, paint);
paint.setColor(color);
paint.setStyle(SkPaint::kStroke_Style);
canvas->drawPath(path, paint);
}
virtual void onDrawContent(SkCanvas* canvas) {
if (false) { // avoid bit rot, suppress warning
test_strokerect(canvas);
return;
}
if (false) { // avoid bit rot, suppress warning
test_text(canvas);
return;
}
#ifdef SK_DEBUG
if (true) {
SkRegion a, b, c;
test_union_bug_1505668(&a, &b, &c);
if (false) { // draw the result of the test
SkPaint paint;
canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
paint.setColor(SK_ColorRED);
paint_rgn(canvas, a, paint);
paint.setColor(0x800000FF);
paint_rgn(canvas, b, paint);
paint.setColor(SK_ColorBLACK);
paint.setStyle(SkPaint::kStroke_Style);
// paint_rgn(canvas, c, paint);
return;
}
}
#endif
const SkPoint origins[] = {
{ 30*SK_Scalar1, 50*SK_Scalar1 },
{ 150*SK_Scalar1, 50*SK_Scalar1 },
};
this->drawPredicates(canvas, origins);
static const struct {
SkColor fColor;
const char* fName;
SkRegion::Op fOp;
} gOps[] = {
{ SK_ColorBLACK, "Difference", SkRegion::kDifference_Op },
{ SK_ColorRED, "Intersect", SkRegion::kIntersect_Op },
{ 0xFF008800, "Union", SkRegion::kUnion_Op },
{ SK_ColorBLUE, "XOR", SkRegion::kXOR_Op }
};
SkPaint textPaint;
textPaint.setAntiAlias(true);
textPaint.setTextSize(SK_Scalar1*24);
this->drawOrig(canvas, false);
canvas->save();
canvas->translate(SkIntToScalar(200), 0);
this->drawRgnOped(canvas, SkRegion::kUnion_Op, SK_ColorBLACK);
canvas->restore();
canvas->translate(0, SkIntToScalar(200));
for (size_t op = 0; op < SK_ARRAY_COUNT(gOps); op++) {
canvas->drawText(gOps[op].fName, strlen(gOps[op].fName), SkIntToScalar(75), SkIntToScalar(50), textPaint);
this->drawRgnOped(canvas, gOps[op].fOp, gOps[op].fColor);
canvas->save();
canvas->translate(0, SkIntToScalar(200));
this->drawPathOped(canvas, gOps[op].fOp, gOps[op].fColor);
canvas->restore();
canvas->translate(SkIntToScalar(200), 0);
}
}
virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) {
return fRect.contains(SkScalarRound(x), SkScalarRound(y)) ? new Click(this) : NULL;
}
virtual bool onClick(Click* click) {
fRect.offset(click->fICurr.fX - click->fIPrev.fX,
click->fICurr.fY - click->fIPrev.fY);
this->inval(NULL);
return true;
}
private:
SkIRect fBase, fRect;
typedef SampleView INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static SkView* MyFactory() { return new RegionView; }
static SkViewRegister reg(MyFactory);
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