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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 "gm.h"
#include "SkCanvas.h"
#include "SkColorFilterImageFilter.h"
#include "SkGradientShader.h"
#include "SkTableColorFilter.h"
static void make_bm0(SkBitmap* bm) {
int W = 120;
int H = 120;
bm->allocN32Pixels(W, H);
bm->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*bm);
SkPaint paint;
SkPoint pts[] = { {0, 0}, {SkIntToScalar(W), SkIntToScalar(H)} };
SkColor colors[] = {
SK_ColorBLACK, SK_ColorGREEN, SK_ColorCYAN,
SK_ColorRED, 0, SK_ColorBLUE, SK_ColorWHITE
};
SkShader* s = SkGradientShader::CreateLinear(pts, colors, NULL, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode);
paint.setShader(s)->unref();
canvas.drawPaint(paint);
}
static void make_bm1(SkBitmap* bm) {
int W = 120;
int H = 120;
bm->allocN32Pixels(W, H);
bm->eraseColor(SK_ColorTRANSPARENT);
SkCanvas canvas(*bm);
SkPaint paint;
SkScalar cx = SkIntToScalar(W)/2;
SkScalar cy = SkIntToScalar(H)/2;
SkColor colors[] = {
SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE,
};
SkShader* s = SkGradientShader::CreateRadial(SkPoint::Make(SkIntToScalar(W)/2,
SkIntToScalar(H)/2),
SkIntToScalar(W)/2, colors, NULL, SK_ARRAY_COUNT(colors),
SkShader::kClamp_TileMode);
paint.setShader(s)->unref();
paint.setAntiAlias(true);
canvas.drawCircle(cx, cy, cx, paint);
}
static void make_table0(uint8_t table[]) {
for (int i = 0; i < 256; ++i) {
int n = i >> 5;
table[i] = (n << 5) | (n << 2) | (n >> 1);
}
}
static void make_table1(uint8_t table[]) {
for (int i = 0; i < 256; ++i) {
table[i] = i * i / 255;
}
}
static void make_table2(uint8_t table[]) {
for (int i = 0; i < 256; ++i) {
float fi = i / 255.0f;
table[i] = static_cast<uint8_t>(sqrtf(fi) * 255);
}
}
static SkColorFilter* make_null_cf() {
return NULL;
}
static SkColorFilter* make_cf0() {
uint8_t table[256]; make_table0(table);
return SkTableColorFilter::Create(table);
}
static SkColorFilter* make_cf1() {
uint8_t table[256]; make_table1(table);
return SkTableColorFilter::Create(table);
}
static SkColorFilter* make_cf2() {
uint8_t table[256]; make_table2(table);
return SkTableColorFilter::Create(table);
}
static SkColorFilter* make_cf3() {
uint8_t table0[256]; make_table0(table0);
uint8_t table1[256]; make_table1(table1);
uint8_t table2[256]; make_table2(table2);
return SkTableColorFilter::CreateARGB(NULL, table0, table1, table2);
}
class TableColorFilterGM : public skiagm::GM {
public:
TableColorFilterGM() {}
protected:
virtual SkString onShortName() {
return SkString("tablecolorfilter");
}
virtual SkISize onISize() {
return SkISize::Make(700, 1650);
}
virtual void onDraw(SkCanvas* canvas) {
canvas->drawColor(0xFFDDDDDD);
canvas->translate(20, 20);
static SkColorFilter* (*gColorFilterMakers[])() = { make_null_cf, make_cf0, make_cf1,
make_cf2, make_cf3 };
static void (*gBitmapMakers[])(SkBitmap*) = { make_bm0, make_bm1 };
// This test will be done once for each bitmap with the results stacked vertically.
// For a single bitmap the resulting image will be the following:
// - A first line with the original bitmap, followed by the image drawn once
// with each of the N color filters
// - N lines of the bitmap drawn N times, this will cover all N*N combinations of
// pair of color filters in order to test the collpsing of consecutive table
// color filters.
//
// Here is a graphical representation of the result for 2 bitmaps and 2 filters
// with the number corresponding to the number of filters the bitmap goes through:
//
// --bitmap1
// 011
// 22
// 22
// --bitmap2
// 011
// 22
// 22
SkScalar x = 0, y = 0;
for (size_t bitmapMaker = 0; bitmapMaker < SK_ARRAY_COUNT(gBitmapMakers); ++bitmapMaker) {
SkBitmap bm;
gBitmapMakers[bitmapMaker](&bm);
SkScalar xOffset = SkScalar(bm.width() * 9 / 8);
SkScalar yOffset = SkScalar(bm.height() * 9 / 8);
// Draw the first element of the first line
x = 0;
SkPaint paint;
canvas->drawBitmap(bm, x, y, &paint);
// Draws the rest of the first line for this bitmap
// each draw being at xOffset of the previous one
for (unsigned i = 1; i < SK_ARRAY_COUNT(gColorFilterMakers); ++i) {
x += xOffset;
paint.setColorFilter(gColorFilterMakers[i]())->unref();
canvas->drawBitmap(bm, x, y, &paint);
}
paint.setColorFilter(NULL);
for (unsigned i = 0; i < SK_ARRAY_COUNT(gColorFilterMakers); ++i) {
SkAutoTUnref<SkColorFilter> colorFilter1(gColorFilterMakers[i]());
SkAutoTUnref<SkImageFilter> imageFilter1(SkColorFilterImageFilter::Create(
colorFilter1, NULL, NULL, 0));
// Move down to the next line and draw it
// each draw being at xOffset of the previous one
y += yOffset;
x = 0;
for (unsigned j = 1; j < SK_ARRAY_COUNT(gColorFilterMakers); ++j) {
SkAutoTUnref<SkColorFilter> colorFilter2(gColorFilterMakers[j]());
SkAutoTUnref<SkImageFilter> imageFilter2(SkColorFilterImageFilter::Create(
colorFilter2, imageFilter1, NULL, 0));
paint.setImageFilter(imageFilter2);
canvas->drawBitmap(bm, x, y, &paint);
x += xOffset;
}
}
// Move down one line to the beginning of the block for next bitmap
y += yOffset;
}
}
private:
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
static skiagm::GM* MyFactory(void*) { return new TableColorFilterGM; }
static skiagm::GMRegistry reg(MyFactory);
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