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Merge "Correct PorterDuff filters." into lmp-dev

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This commit is contained in:
Deepanshu Gupta
2015-03-02 19:40:12 +00:00
committed by Android (Google) Code Review
parent 369ad57b00 1a10ca7e52
commit 72d75f8d9f
2 changed files with 38 additions and 518 deletions
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554
tools/layoutlib/bridge/src/android/graphics/BlendComposite.java
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@@ -29,75 +29,38 @@ import java.awt.image.WritableRaster;
* The class is adapted from a demo tool for Blending Modes written by * The class is adapted from a demo tool for Blending Modes written by
* Romain Guy (romainguy@android.com). The tool is available at * Romain Guy (romainguy@android.com). The tool is available at
* http://www.curious-creature.org/2006/09/20/new-blendings-modes-for-java2d/ * http://www.curious-creature.org/2006/09/20/new-blendings-modes-for-java2d/
*
* This class has been adapted for applying color filters. When applying color filters, the src
* image should not extend beyond the dest image, but in our implementation of the filters, it does.
* To compensate for the effect, we recompute the alpha value of the src image before applying
* the color filter as it should have been applied.
*/ */
public final class BlendComposite implements Composite { public final class BlendComposite implements Composite {
public enum BlendingMode { public enum BlendingMode {
NORMAL, MULTIPLY(Multiply),
AVERAGE, SCREEN(Screen),
MULTIPLY, DARKEN(Darken),
SCREEN, LIGHTEN(Lighten),
DARKEN, OVERLAY(Overlay),
LIGHTEN, ADD(Add);
OVERLAY,
HARD_LIGHT, private BlendComposite mComposite;
SOFT_LIGHT,
DIFFERENCE, BlendingMode(BlendComposite composite) {
NEGATION, mComposite = composite;
EXCLUSION, }
COLOR_DODGE,
INVERSE_COLOR_DODGE, BlendComposite getBlendComposite() {
SOFT_DODGE, return mComposite;
COLOR_BURN, }
INVERSE_COLOR_BURN,
SOFT_BURN,
REFLECT,
GLOW,
FREEZE,
HEAT,
ADD,
SUBTRACT,
STAMP,
RED,
GREEN,
BLUE,
HUE,
SATURATION,
COLOR,
LUMINOSITY
} }
public static final BlendComposite Normal = new BlendComposite(BlendingMode.NORMAL);
public static final BlendComposite Average = new BlendComposite(BlendingMode.AVERAGE);
public static final BlendComposite Multiply = new BlendComposite(BlendingMode.MULTIPLY); public static final BlendComposite Multiply = new BlendComposite(BlendingMode.MULTIPLY);
public static final BlendComposite Screen = new BlendComposite(BlendingMode.SCREEN); public static final BlendComposite Screen = new BlendComposite(BlendingMode.SCREEN);
public static final BlendComposite Darken = new BlendComposite(BlendingMode.DARKEN); public static final BlendComposite Darken = new BlendComposite(BlendingMode.DARKEN);
public static final BlendComposite Lighten = new BlendComposite(BlendingMode.LIGHTEN); public static final BlendComposite Lighten = new BlendComposite(BlendingMode.LIGHTEN);
public static final BlendComposite Overlay = new BlendComposite(BlendingMode.OVERLAY); public static final BlendComposite Overlay = new BlendComposite(BlendingMode.OVERLAY);
public static final BlendComposite HardLight = new BlendComposite(BlendingMode.HARD_LIGHT);
public static final BlendComposite SoftLight = new BlendComposite(BlendingMode.SOFT_LIGHT);
public static final BlendComposite Difference = new BlendComposite(BlendingMode.DIFFERENCE);
public static final BlendComposite Negation = new BlendComposite(BlendingMode.NEGATION);
public static final BlendComposite Exclusion = new BlendComposite(BlendingMode.EXCLUSION);
public static final BlendComposite ColorDodge = new BlendComposite(BlendingMode.COLOR_DODGE);
public static final BlendComposite InverseColorDodge = new BlendComposite(BlendingMode.INVERSE_COLOR_DODGE);
public static final BlendComposite SoftDodge = new BlendComposite(BlendingMode.SOFT_DODGE);
public static final BlendComposite ColorBurn = new BlendComposite(BlendingMode.COLOR_BURN);
public static final BlendComposite InverseColorBurn = new BlendComposite(BlendingMode.INVERSE_COLOR_BURN);
public static final BlendComposite SoftBurn = new BlendComposite(BlendingMode.SOFT_BURN);
public static final BlendComposite Reflect = new BlendComposite(BlendingMode.REFLECT);
public static final BlendComposite Glow = new BlendComposite(BlendingMode.GLOW);
public static final BlendComposite Freeze = new BlendComposite(BlendingMode.FREEZE);
public static final BlendComposite Heat = new BlendComposite(BlendingMode.HEAT);
public static final BlendComposite Add = new BlendComposite(BlendingMode.ADD); public static final BlendComposite Add = new BlendComposite(BlendingMode.ADD);
public static final BlendComposite Subtract = new BlendComposite(BlendingMode.SUBTRACT);
public static final BlendComposite Stamp = new BlendComposite(BlendingMode.STAMP);
public static final BlendComposite Red = new BlendComposite(BlendingMode.RED);
public static final BlendComposite Green = new BlendComposite(BlendingMode.GREEN);
public static final BlendComposite Blue = new BlendComposite(BlendingMode.BLUE);
public static final BlendComposite Hue = new BlendComposite(BlendingMode.HUE);
public static final BlendComposite Saturation = new BlendComposite(BlendingMode.SATURATION);
public static final BlendComposite Color = new BlendComposite(BlendingMode.COLOR);
public static final BlendComposite Luminosity = new BlendComposite(BlendingMode.LUMINOSITY);
private float alpha; private float alpha;
private BlendingMode mode; private BlendingMode mode;
@@ -112,21 +75,16 @@ public final class BlendComposite implements Composite {
} }
public static BlendComposite getInstance(BlendingMode mode) { public static BlendComposite getInstance(BlendingMode mode) {
return new BlendComposite(mode); return mode.getBlendComposite();
} }
public static BlendComposite getInstance(BlendingMode mode, float alpha) { public static BlendComposite getInstance(BlendingMode mode, float alpha) {
if (alpha > 0.9999f) {
return getInstance(mode);
}
return new BlendComposite(mode, alpha); return new BlendComposite(mode, alpha);
} }
public BlendComposite derive(BlendingMode mode) {
return this.mode == mode ? this : new BlendComposite(mode, getAlpha());
}
public BlendComposite derive(float alpha) {
return this.alpha == alpha ? this : new BlendComposite(getMode(), alpha);
}
public float getAlpha() { public float getAlpha() {
return alpha; return alpha;
} }
@@ -157,11 +115,7 @@ public final class BlendComposite implements Composite {
BlendComposite bc = (BlendComposite) obj; BlendComposite bc = (BlendComposite) obj;
if (mode != bc.mode) { return mode == bc.mode && alpha == bc.alpha;
return false;
}
return alpha == bc.alpha;
} }
public CompositeContext createContext(ColorModel srcColorModel, public CompositeContext createContext(ColorModel srcColorModel,
@@ -220,6 +174,11 @@ public final class BlendComposite implements Composite {
dstPixel[2] = (pixel ) & 0xFF; dstPixel[2] = (pixel ) & 0xFF;
dstPixel[3] = (pixel >> 24) & 0xFF; dstPixel[3] = (pixel >> 24) & 0xFF;
// ---- Modified from original ----
// recompute src pixel for transparency.
srcPixel[3] *= dstPixel[3] / 0xFF;
// ---- Modification ends ----
result = blender.blend(srcPixel, dstPixel, result); result = blender.blend(srcPixel, dstPixel, result);
// mixes the result with the opacity // mixes the result with the opacity
@@ -246,123 +205,8 @@ public final class BlendComposite implements Composite {
private static abstract class Blender { private static abstract class Blender {
public abstract int[] blend(int[] src, int[] dst, int[] result); public abstract int[] blend(int[] src, int[] dst, int[] result);
private static void RGBtoHSL(int r, int g, int b, float[] hsl) {
float var_R = (r / 255f);
float var_G = (g / 255f);
float var_B = (b / 255f);
float var_Min;
float var_Max;
float del_Max;
if (var_R > var_G) {
var_Min = var_G;
var_Max = var_R;
} else {
var_Min = var_R;
var_Max = var_G;
}
if (var_B > var_Max) {
var_Max = var_B;
}
if (var_B < var_Min) {
var_Min = var_B;
}
del_Max = var_Max - var_Min;
float H, S, L;
L = (var_Max + var_Min) / 2f;
if (del_Max - 0.01f <= 0.0f) {
H = 0;
S = 0;
} else {
if (L < 0.5f) {
S = del_Max / (var_Max + var_Min);
} else {
S = del_Max / (2 - var_Max - var_Min);
}
float del_R = (((var_Max - var_R) / 6f) + (del_Max / 2f)) / del_Max;
float del_G = (((var_Max - var_G) / 6f) + (del_Max / 2f)) / del_Max;
float del_B = (((var_Max - var_B) / 6f) + (del_Max / 2f)) / del_Max;
if (var_R == var_Max) {
H = del_B - del_G;
} else if (var_G == var_Max) {
H = (1 / 3f) + del_R - del_B;
} else {
H = (2 / 3f) + del_G - del_R;
}
if (H < 0) {
H += 1;
}
if (H > 1) {
H -= 1;
}
}
hsl[0] = H;
hsl[1] = S;
hsl[2] = L;
}
private static void HSLtoRGB(float h, float s, float l, int[] rgb) {
int R, G, B;
if (s - 0.01f <= 0.0f) {
R = (int) (l * 255.0f);
G = (int) (l * 255.0f);
B = (int) (l * 255.0f);
} else {
float var_1, var_2;
if (l < 0.5f) {
var_2 = l * (1 + s);
} else {
var_2 = (l + s) - (s * l);
}
var_1 = 2 * l - var_2;
R = (int) (255.0f * hue2RGB(var_1, var_2, h + (1.0f / 3.0f)));
G = (int) (255.0f * hue2RGB(var_1, var_2, h));
B = (int) (255.0f * hue2RGB(var_1, var_2, h - (1.0f / 3.0f)));
}
rgb[0] = R;
rgb[1] = G;
rgb[2] = B;
}
private static float hue2RGB(float v1, float v2, float vH) {
if (vH < 0.0f) {
vH += 1.0f;
}
if (vH > 1.0f) {
vH -= 1.0f;
}
if ((6.0f * vH) < 1.0f) {
return (v1 + (v2 - v1) * 6.0f * vH);
}
if ((2.0f * vH) < 1.0f) {
return (v2);
}
if ((3.0f * vH) < 2.0f) {
return (v1 + (v2 - v1) * ((2.0f / 3.0f) - vH) * 6.0f);
}
return (v1);
}
public static Blender getBlenderFor(BlendComposite composite) { public static Blender getBlenderFor(BlendComposite composite) {
switch (composite.getMode()) { switch (composite.getMode()) {
case NORMAL:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
System.arraycopy(src, 0, result, 0, 4);
return result;
}
};
case ADD: case ADD:
return new Blender() { return new Blender() {
@Override @Override
@@ -373,65 +217,6 @@ public final class BlendComposite implements Composite {
return result; return result;
} }
}; };
case AVERAGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = (src[i] + dst[i]) >> 1;
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case BLUE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
System.arraycopy(dst, 0, result, 0, 3);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case COLOR:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
HSLtoRGB(srcHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case COLOR_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = src[i] == 0 ? 0 :
Math.max(0, 255 - (((255 - dst[i]) << 8) / src[i]));
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case COLOR_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = src[i] == 255 ? 255 :
Math.min((dst[i] << 8) / (255 - src[i]), 255);
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case DARKEN: case DARKEN:
return new Blender() { return new Blender() {
@Override @Override
@@ -443,136 +228,6 @@ public final class BlendComposite implements Composite {
return result; return result;
} }
}; };
case DIFFERENCE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = dst[i] + src[i] - (dst[i] * src[i] >> 7);
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case EXCLUSION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = dst[i] + src[i] - (dst[i] * src[i] >> 7);
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case FREEZE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = src[i] == 0 ? 0 :
Math.max(0, 255 - (255 - dst[i]) * (255 - dst[i]) / src[i]);
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case GLOW:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
for (int i = 0; i < 3; i++) {
result[i] = dst[i] == 255 ? 255 :
Math.min(255, src[i] * src[i] / (255 - dst[i]));
}
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case GREEN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0],
dst[1],
src[2],
Math.min(255, src[3] + dst[3])
};
}
};
case HARD_LIGHT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
src[0] < 128 ? dst[0] * src[0] >> 7 :
255 - ((255 - src[0]) * (255 - dst[0]) >> 7),
src[1] < 128 ? dst[1] * src[1] >> 7 :
255 - ((255 - src[1]) * (255 - dst[1]) >> 7),
src[2] < 128 ? dst[2] * src[2] >> 7 :
255 - ((255 - src[2]) * (255 - dst[2]) >> 7),
Math.min(255, src[3] + dst[3])
};
}
};
case HEAT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0] == 0 ? 0 : Math.max(0, 255 - (255 - src[0]) * (255 - src[0]) / dst[0]),
dst[1] == 0 ? 0 : Math.max(0, 255 - (255 - src[1]) * (255 - src[1]) / dst[1]),
dst[2] == 0 ? 0 : Math.max(0, 255 - (255 - src[2]) * (255 - src[2]) / dst[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case HUE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
HSLtoRGB(srcHSL[0], dstHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case INVERSE_COLOR_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[0]) << 8) / dst[0])),
dst[1] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[1]) << 8) / dst[1])),
dst[2] == 0 ? 0 :
Math.max(0, 255 - (((255 - src[2]) << 8) / dst[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case INVERSE_COLOR_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0] == 255 ? 255 :
Math.min((src[0] << 8) / (255 - dst[0]), 255),
dst[1] == 255 ? 255 :
Math.min((src[1] << 8) / (255 - dst[1]), 255),
dst[2] == 255 ? 255 :
Math.min((src[2] << 8) / (255 - dst[2]), 255),
Math.min(255, src[3] + dst[3])
};
}
};
case LIGHTEN: case LIGHTEN:
return new Blender() { return new Blender() {
@Override @Override
@@ -581,21 +236,6 @@ public final class BlendComposite implements Composite {
result[i] = Math.max(src[i], dst[i]); result[i] = Math.max(src[i], dst[i]);
} }
result[3] = Math.min(255, src[3] + dst[3]); result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case LUMINOSITY:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
HSLtoRGB(dstHSL[0], dstHSL[1], srcHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result; return result;
} }
}; };
@@ -606,22 +246,10 @@ public final class BlendComposite implements Composite {
for (int i = 0; i < 3; i++) { for (int i = 0; i < 3; i++) {
result[i] = (src[i] * dst[i]) >> 8; result[i] = (src[i] * dst[i]) >> 8;
} }
result[3] = Math.min(255, src[3] + dst[3]); result[3] = Math.min(255, src[3] + dst[3] - (src[3] * dst[3]) / 255);
return result; return result;
} }
}; };
case NEGATION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
255 - Math.abs(255 - dst[0] - src[0]),
255 - Math.abs(255 - dst[1] - src[1]),
255 - Math.abs(255 - dst[2] - src[2]),
Math.min(255, src[3] + dst[3])
};
}
};
case OVERLAY: case OVERLAY:
return new Blender() { return new Blender() {
@Override @Override
@@ -631,45 +259,6 @@ public final class BlendComposite implements Composite {
255 - ((255 - dst[i]) * (255 - src[i]) >> 7); 255 - ((255 - dst[i]) * (255 - src[i]) >> 7);
} }
result[3] = Math.min(255, src[3] + dst[3]); result[3] = Math.min(255, src[3] + dst[3]);
return result;
}
};
case RED:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
src[0],
dst[1],
dst[2],
Math.min(255, src[3] + dst[3])
};
}
};
case REFLECT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
src[0] == 255 ? 255 : Math.min(255, dst[0] * dst[0] / (255 - src[0])),
src[1] == 255 ? 255 : Math.min(255, dst[1] * dst[1] / (255 - src[1])),
src[2] == 255 ? 255 : Math.min(255, dst[2] * dst[2] / (255 - src[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SATURATION:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
float[] srcHSL = new float[3];
RGBtoHSL(src[0], src[1], src[2], srcHSL);
float[] dstHSL = new float[3];
RGBtoHSL(dst[0], dst[1], dst[2], dstHSL);
HSLtoRGB(dstHSL[0], srcHSL[1], dstHSL[2], result);
result[3] = Math.min(255, src[3] + dst[3]);
return result; return result;
} }
}; };
@@ -677,80 +266,11 @@ public final class BlendComposite implements Composite {
return new Blender() { return new Blender() {
@Override @Override
public int[] blend(int[] src, int[] dst, int[] result) { public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] { result[0] = 255 - ((255 - src[0]) * (255 - dst[0]) >> 8);
255 - ((255 - src[0]) * (255 - dst[0]) >> 8), result[1] = 255 - ((255 - src[1]) * (255 - dst[1]) >> 8);
255 - ((255 - src[1]) * (255 - dst[1]) >> 8), result[2] = 255 - ((255 - src[2]) * (255 - dst[2]) >> 8);
255 - ((255 - src[2]) * (255 - dst[2]) >> 8), result[3] = Math.min(255, src[3] + dst[3]);
Math.min(255, src[3] + dst[3]) return result;
};
}
};
case SOFT_BURN:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0] + src[0] < 256 ?
(dst[0] == 255 ? 255 :
Math.min(255, (src[0] << 7) / (255 - dst[0]))) :
Math.max(0, 255 - (((255 - dst[0]) << 7) / src[0])),
dst[1] + src[1] < 256 ?
(dst[1] == 255 ? 255 :
Math.min(255, (src[1] << 7) / (255 - dst[1]))) :
Math.max(0, 255 - (((255 - dst[1]) << 7) / src[1])),
dst[2] + src[2] < 256 ?
(dst[2] == 255 ? 255 :
Math.min(255, (src[2] << 7) / (255 - dst[2]))) :
Math.max(0, 255 - (((255 - dst[2]) << 7) / src[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SOFT_DODGE:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
dst[0] + src[0] < 256 ?
(src[0] == 255 ? 255 :
Math.min(255, (dst[0] << 7) / (255 - src[0]))) :
Math.max(0, 255 - (((255 - src[0]) << 7) / dst[0])),
dst[1] + src[1] < 256 ?
(src[1] == 255 ? 255 :
Math.min(255, (dst[1] << 7) / (255 - src[1]))) :
Math.max(0, 255 - (((255 - src[1]) << 7) / dst[1])),
dst[2] + src[2] < 256 ?
(src[2] == 255 ? 255 :
Math.min(255, (dst[2] << 7) / (255 - src[2]))) :
Math.max(0, 255 - (((255 - src[2]) << 7) / dst[2])),
Math.min(255, src[3] + dst[3])
};
}
};
case SOFT_LIGHT:
break;
case STAMP:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
Math.max(0, Math.min(255, dst[0] + 2 * src[0] - 256)),
Math.max(0, Math.min(255, dst[1] + 2 * src[1] - 256)),
Math.max(0, Math.min(255, dst[2] + 2 * src[2] - 256)),
Math.min(255, src[3] + dst[3])
};
}
};
case SUBTRACT:
return new Blender() {
@Override
public int[] blend(int[] src, int[] dst, int[] result) {
return new int[] {
Math.max(0, src[0] + dst[0] - 256),
Math.max(0, src[1] + dst[1] - 256),
Math.max(0, src[2] + dst[2] - 256),
Math.min(255, src[3] + dst[3])
};
} }
}; };
} }

2
tools/layoutlib/bridge/src/android/graphics/PorterDuffColorFilter_Delegate.java
View File

@@ -103,7 +103,7 @@ public class PorterDuffColorFilter_Delegate extends ColorFilter_Delegate {
// For filtering the colors, the src image should contain the "color" only for pixel values // For filtering the colors, the src image should contain the "color" only for pixel values
// which are not transparent in the target image. But, we are using a simple rectangular image // which are not transparent in the target image. But, we are using a simple rectangular image
// completely filled with color. Hence some Composite rules do not apply as intended. However, // completely filled with color. Hence some Composite rules do not apply as intended. However,
// in such cases, they can usually be mapped to some other mode, which produces an // in such cases, they can usually be mapped to some other mode, which produces an approximately
// equivalent result. // equivalent result.
private Mode getCompatibleMode(Mode mode) { private Mode getCompatibleMode(Mode mode) {
Mode m = mode; Mode m = mode;