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/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.cyanogenmod.trebuchet;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.PorterDuffXfermode;
public class HolographicOutlineHelper {
private final Paint mHolographicPaint = new Paint();
private final Paint mBlurPaint = new Paint();
private final Paint mErasePaint = new Paint();
public static final int MAX_OUTER_BLUR_RADIUS;
public static final int MIN_OUTER_BLUR_RADIUS;
private static final BlurMaskFilter sExtraThickOuterBlurMaskFilter;
private static final BlurMaskFilter sThickOuterBlurMaskFilter;
private static final BlurMaskFilter sMediumOuterBlurMaskFilter;
private static final BlurMaskFilter sThinOuterBlurMaskFilter;
private static final BlurMaskFilter sThickInnerBlurMaskFilter;
private static final BlurMaskFilter sExtraThickInnerBlurMaskFilter;
private static final BlurMaskFilter sMediumInnerBlurMaskFilter;
private static final int THICK = 0;
private static final int MEDIUM = 1;
private static final int EXTRA_THICK = 2;
static {
final float scale = LauncherApplication.getScreenDensity();
MIN_OUTER_BLUR_RADIUS = (int) (scale * 1.0f);
MAX_OUTER_BLUR_RADIUS = (int) (scale * 12.0f);
sExtraThickOuterBlurMaskFilter = new BlurMaskFilter(scale * 12.0f, BlurMaskFilter.Blur.OUTER);
sThickOuterBlurMaskFilter = new BlurMaskFilter(scale * 6.0f, BlurMaskFilter.Blur.OUTER);
sMediumOuterBlurMaskFilter = new BlurMaskFilter(scale * 2.0f, BlurMaskFilter.Blur.OUTER);
sThinOuterBlurMaskFilter = new BlurMaskFilter(scale * 1.0f, BlurMaskFilter.Blur.OUTER);
sExtraThickInnerBlurMaskFilter = new BlurMaskFilter(scale * 6.0f, BlurMaskFilter.Blur.NORMAL);
sThickInnerBlurMaskFilter = new BlurMaskFilter(scale * 4.0f, BlurMaskFilter.Blur.NORMAL);
sMediumInnerBlurMaskFilter = new BlurMaskFilter(scale * 2.0f, BlurMaskFilter.Blur.NORMAL);
}
HolographicOutlineHelper() {
mHolographicPaint.setFilterBitmap(true);
mHolographicPaint.setAntiAlias(true);
mBlurPaint.setFilterBitmap(true);
mBlurPaint.setAntiAlias(true);
mErasePaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_OUT));
mErasePaint.setFilterBitmap(true);
mErasePaint.setAntiAlias(true);
}
/**
* Returns the interpolated holographic highlight alpha for the effect we want when scrolling
* pages.
*/
public static float highlightAlphaInterpolator(float r) {
float maxAlpha = 0.6f;
return (float) Math.pow(maxAlpha * (1.0f - r), 1.5f);
}
/**
* Returns the interpolated view alpha for the effect we want when scrolling pages.
*/
public static float viewAlphaInterpolator(float r) {
final float pivot = 0.95f;
if (r < pivot) {
return (float) Math.pow(r / pivot, 1.5f);
} else {
return 1.0f;
}
}
/**
* Applies a more expensive and accurate outline to whatever is currently drawn in a specified
* bitmap.
*/
void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor, int thickness) {
applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, true,
thickness);
}
void applyExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor, boolean clipAlpha, int thickness) {
// We start by removing most of the alpha channel so as to ignore shadows, and
// other types of partial transparency when defining the shape of the object
if (clipAlpha) {
int[] srcBuffer = new int[srcDst.getWidth() * srcDst.getHeight()];
srcDst.getPixels(srcBuffer,
0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
for (int i = 0; i < srcBuffer.length; i++) {
final int alpha = srcBuffer[i] >>> 24;
if (alpha < 188) {
srcBuffer[i] = 0;
}
}
srcDst.setPixels(srcBuffer,
0, srcDst.getWidth(), 0, 0, srcDst.getWidth(), srcDst.getHeight());
}
Bitmap glowShape = srcDst.extractAlpha();
// calculate the outer blur first
BlurMaskFilter outerBlurMaskFilter;
switch (thickness) {
case EXTRA_THICK:
outerBlurMaskFilter = sExtraThickOuterBlurMaskFilter;
break;
case THICK:
outerBlurMaskFilter = sThickOuterBlurMaskFilter;
break;
case MEDIUM:
outerBlurMaskFilter = sMediumOuterBlurMaskFilter;
break;
default:
throw new RuntimeException("Invalid blur thickness");
}
mBlurPaint.setMaskFilter(outerBlurMaskFilter);
int[] outerBlurOffset = new int[2];
Bitmap thickOuterBlur = glowShape.extractAlpha(mBlurPaint, outerBlurOffset);
if (thickness == EXTRA_THICK) {
mBlurPaint.setMaskFilter(sMediumOuterBlurMaskFilter);
} else {
mBlurPaint.setMaskFilter(sThinOuterBlurMaskFilter);
}
int[] brightOutlineOffset = new int[2];
Bitmap brightOutline = glowShape.extractAlpha(mBlurPaint, brightOutlineOffset);
// calculate the inner blur
srcDstCanvas.setBitmap(glowShape);
srcDstCanvas.drawColor(0xFF000000, PorterDuff.Mode.SRC_OUT);
BlurMaskFilter innerBlurMaskFilter;
switch (thickness) {
case EXTRA_THICK:
innerBlurMaskFilter = sExtraThickInnerBlurMaskFilter;
break;
case THICK:
innerBlurMaskFilter = sThickInnerBlurMaskFilter;
break;
case MEDIUM:
innerBlurMaskFilter = sMediumInnerBlurMaskFilter;
break;
default:
throw new RuntimeException("Invalid blur thickness");
}
mBlurPaint.setMaskFilter(innerBlurMaskFilter);
int[] thickInnerBlurOffset = new int[2];
Bitmap thickInnerBlur = glowShape.extractAlpha(mBlurPaint, thickInnerBlurOffset);
// mask out the inner blur
srcDstCanvas.setBitmap(thickInnerBlur);
srcDstCanvas.drawBitmap(glowShape, -thickInnerBlurOffset[0],
-thickInnerBlurOffset[1], mErasePaint);
srcDstCanvas.drawRect(0, 0, -thickInnerBlurOffset[0], thickInnerBlur.getHeight(),
mErasePaint);
srcDstCanvas.drawRect(0, 0, thickInnerBlur.getWidth(), -thickInnerBlurOffset[1],
mErasePaint);
// draw the inner and outer blur
srcDstCanvas.setBitmap(srcDst);
srcDstCanvas.drawColor(0, PorterDuff.Mode.CLEAR);
mHolographicPaint.setColor(color);
srcDstCanvas.drawBitmap(thickInnerBlur, thickInnerBlurOffset[0], thickInnerBlurOffset[1],
mHolographicPaint);
srcDstCanvas.drawBitmap(thickOuterBlur, outerBlurOffset[0], outerBlurOffset[1],
mHolographicPaint);
// draw the bright outline
mHolographicPaint.setColor(outlineColor);
srcDstCanvas.drawBitmap(brightOutline, brightOutlineOffset[0], brightOutlineOffset[1],
mHolographicPaint);
// cleanup
srcDstCanvas.setBitmap(null);
brightOutline.recycle();
thickOuterBlur.recycle();
thickInnerBlur.recycle();
glowShape.recycle();
}
void applyExtraThickExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor) {
applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, EXTRA_THICK);
}
void applyThickExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor) {
applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, THICK);
}
void applyMediumExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor, boolean clipAlpha) {
applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, clipAlpha,
MEDIUM);
}
void applyMediumExpensiveOutlineWithBlur(Bitmap srcDst, Canvas srcDstCanvas, int color,
int outlineColor) {
applyExpensiveOutlineWithBlur(srcDst, srcDstCanvas, color, outlineColor, MEDIUM);
}
}
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