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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 "include/core/SkCanvas.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkPaint.h"
- #include "include/core/SkShader.h"
- #include "samplecode/Sample.h"
- #include "tools/ToolUtils.h"
- static int inflate5To8(int x) {
- return (x << 3) | (x >> 2);
- }
- static int trunc5(int x) {
- return x >> 3;
- }
- #define SK_R16_BITS 5
- #ifdef SK_DEBUG
- static int round5_slow(int x) {
- int orig = x & 7;
- int fake = x >> 5;
- int trunc = x >> 3;
- int diff = fake - orig;
- int bias = 0;
- if (diff > 4) {
- bias = -1;
- } else if (diff < -4) {
- bias = 1;
- }
- return trunc + bias;
- }
- #endif
- static int round5_fast(int x) {
- int result = x + 3 - (x >> 5) + (x >> 7);
- result >>= 3;
- #ifdef SK_DEBUG
- {
- int r2 = round5_slow(x);
- SkASSERT(r2 == result);
- }
- #endif
- return result;
- }
- static void test_5bits() {
- int e0 = 0;
- int e1 = 0;
- int e2 = 0;
- int ae0 = 0;
- int ae1 = 0;
- int ae2 = 0;
- for (int i = 0; i < 256; i++) {
- int t0 = trunc5(i);
- int t1 = round5_fast(i);
- int t2 = trunc5(i);
- int v0 = inflate5To8(t0);
- int v1 = inflate5To8(t1);
- int v2 = inflate5To8(t2);
- int err0 = i - v0;
- int err1 = i - v1;
- int err2 = i - v2;
- SkDebugf("--- %3d : trunc=%3d (%2d) round:%3d (%2d) \n"/*new:%d (%2d)\n"*/, i,
- v0, err0, v1, err1, v2, err2);
- e0 += err0;
- e1 += err1;
- e2 += err2;
- ae0 += SkAbs32(err0);
- ae1 += SkAbs32(err1);
- ae2 += SkAbs32(err2);
- }
- SkDebugf("--- trunc: %d %d round: %d %d new: %d %d\n", e0, ae0, e1, ae1, e2, ae2);
- }
- static SkBitmap createBitmap(int n) {
- SkBitmap bitmap;
- bitmap.allocN32Pixels(n, n);
- bitmap.eraseColor(SK_ColorTRANSPARENT);
- SkCanvas canvas(bitmap);
- SkRect r;
- r.set(0, 0, SkIntToScalar(n), SkIntToScalar(n));
- r.inset(SK_Scalar1, SK_Scalar1);
- SkPaint paint;
- paint.setAntiAlias(true);
- paint.setColor(SK_ColorRED);
- canvas.drawOval(r, paint);
- r.inset(SK_Scalar1*n/4, SK_Scalar1*n/4);
- paint.setBlendMode(SkBlendMode::kSrc);
- paint.setColor(0x800000FF);
- canvas.drawOval(r, paint);
- return bitmap;
- }
- class ColorFilterView : public Sample {
- SkBitmap fBitmap;
- sk_sp<SkShader> fShader;
- enum {
- N = 64
- };
- void onOnceBeforeDraw() override {
- fBitmap = createBitmap(N);
- fShader = ToolUtils::create_checkerboard_shader(0xFFCCCCCC, 0xFFFFFFFF, 12);
- if (false) { // avoid bit rot, suppress warning
- test_5bits();
- }
- }
- SkString name() override { return SkString("ColorFilter"); }
- void onDrawBackground(SkCanvas* canvas) override {
- SkPaint paint;
- paint.setShader(fShader);
- canvas->drawPaint(paint);
- }
- void onDrawContent(SkCanvas* canvas) override {
- if (false) {
- SkPaint p;
- p.setAntiAlias(true);
- SkRect r = { 20.4f, 10, 20.6f, 20 };
- canvas->drawRect(r, p);
- r.set(30.9f, 10, 31.1f, 20);
- canvas->drawRect(r, p);
- return;
- }
- static const SkBlendMode gModes[] = {
- SkBlendMode::kClear,
- SkBlendMode::kSrc,
- SkBlendMode::kDst,
- SkBlendMode::kSrcOver,
- SkBlendMode::kDstOver,
- SkBlendMode::kSrcIn,
- SkBlendMode::kDstIn,
- SkBlendMode::kSrcOut,
- SkBlendMode::kDstOut,
- SkBlendMode::kSrcATop,
- SkBlendMode::kDstATop,
- SkBlendMode::kXor,
- SkBlendMode::kPlus,
- SkBlendMode::kModulate,
- };
- static const SkColor gColors[] = {
- 0xFF000000,
- 0x80000000,
- 0xFF00FF00,
- 0x8000FF00,
- 0x00000000,
- };
- float scale = 1.5f;
- SkPaint paint;
- canvas->translate(N / 8, N / 8);
- for (size_t y = 0; y < SK_ARRAY_COUNT(gColors); y++) {
- for (size_t x = 0; x < SK_ARRAY_COUNT(gModes); x++) {
- paint.setColorFilter(SkColorFilters::Blend(gColors[y], gModes[x]));
- canvas->drawBitmap(fBitmap, x * N * 1.25f, y * N * scale, &paint);
- }
- }
- }
- };
- DEF_SAMPLE( return new ColorFilterView(); )
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