diff options
Diffstat (limited to 'src/com/android/gallery3d/filtershow/filters/saturation.rs')
| -rw-r--r-- | src/com/android/gallery3d/filtershow/filters/saturation.rs | 161 |
1 files changed, 161 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/filtershow/filters/saturation.rs b/src/com/android/gallery3d/filtershow/filters/saturation.rs new file mode 100644 index 000000000..5210e34a3 --- /dev/null +++ b/src/com/android/gallery3d/filtershow/filters/saturation.rs @@ -0,0 +1,161 @@ +/* + * Copyright (C) 2012 Unknown + * + * 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. + */ + +#pragma version(1) +#pragma rs java_package_name(com.android.gallery3d.filtershow.filters) + +#define MAX_CHANELS 7 +#define MAX_HUE 4096 +static const int ABITS = 4; +static const int HSCALE = 256; +static const int k1=255 << ABITS; +static const int k2=HSCALE << ABITS; + +static const float Rf = 0.2999f; +static const float Gf = 0.587f; +static const float Bf = 0.114f; + +rs_matrix3x3 colorMatrix_min; +rs_matrix3x3 colorMatrix_max; + +int mNumberOfLines; +// input data +int saturation[MAX_CHANELS]; +float sat[MAX_CHANELS]; + +float satLut[MAX_HUE]; +// generated data + + +void setupGradParams() { + + int master = saturation[0]; + int max = master+saturation[1]; + int min = max; + + // calculate the minimum and maximum saturation + for (int i = 1; i < MAX_CHANELS; i++) { + int v = master+saturation[i]; + if (max < v) { + max = v; + } + else if (min > v) { + min = v; + } + } + // generate a lookup table for all hue 0 to 4K which goes from 0 to 1 0=min sat 1 = max sat + min = min - 1; + for(int i = 0; i < MAX_HUE ; i++) { + float p = i * 6 / (float)MAX_HUE; + int ip = ((int)(p + .5f)) % 6; + int v = master + saturation[ip + 1]; + satLut[i] = (v - min)/(float)(max - min); + } + + float S = 1 + max / 100.f; + float MS = 1 - S; + float Rt = Rf * MS; + float Gt = Gf * MS; + float Bt = Bf * MS; + float b = 1.f; + + // Generate 2 color matrix one at min sat and one at max + rsMatrixSet(&colorMatrix_max, 0, 0, b * (Rt + S)); + rsMatrixSet(&colorMatrix_max, 1, 0, b * Gt); + rsMatrixSet(&colorMatrix_max, 2, 0, b * Bt); + rsMatrixSet(&colorMatrix_max, 0, 1, b * Rt); + rsMatrixSet(&colorMatrix_max, 1, 1, b * (Gt + S)); + rsMatrixSet(&colorMatrix_max, 2, 1, b * Bt); + rsMatrixSet(&colorMatrix_max, 0, 2, b * Rt); + rsMatrixSet(&colorMatrix_max, 1, 2, b * Gt); + rsMatrixSet(&colorMatrix_max, 2, 2, b * (Bt + S)); + + S = 1 + min / 100.f; + MS = 1-S; + Rt = Rf * MS; + Gt = Gf * MS; + Bt = Bf * MS; + b = 1; + + rsMatrixSet(&colorMatrix_min, 0, 0, b * (Rt + S)); + rsMatrixSet(&colorMatrix_min, 1, 0, b * Gt); + rsMatrixSet(&colorMatrix_min, 2, 0, b * Bt); + rsMatrixSet(&colorMatrix_min, 0, 1, b * Rt); + rsMatrixSet(&colorMatrix_min, 1, 1, b * (Gt + S)); + rsMatrixSet(&colorMatrix_min, 2, 1, b * Bt); + rsMatrixSet(&colorMatrix_min, 0, 2, b * Rt); + rsMatrixSet(&colorMatrix_min, 1, 2, b * Gt); + rsMatrixSet(&colorMatrix_min, 2, 2, b * (Bt + S)); +} + +static ushort rgb2hue( uchar4 rgb) +{ + int iMin,iMax,chroma; + + int ri = rgb.r; + int gi = rgb.g; + int bi = rgb.b; + short rv,rs,rh; + + if (ri > gi) { + iMax = max (ri, bi); + iMin = min (gi, bi); + } else { + iMax = max (gi, bi); + iMin = min (ri, bi); + } + + rv = (short) (iMax << ABITS); + + if (rv == 0) { + return 0; + } + + chroma = iMax - iMin; + rs = (short) ((k1 * chroma) / iMax); + if (rs == 0) { + return 0; + } + + if ( ri == iMax ) { + rh = (short) ((k2 * (6 * chroma + gi - bi))/(6 * chroma)); + if (rh >= k2) { + rh -= k2; + } + return rh; + } + + if (gi == iMax) { + return(short) ((k2 * (2 * chroma + bi - ri)) / (6 * chroma)); + } + + return (short) ((k2 * (4 * chroma + ri - gi)) / (6 * chroma)); +} + +uchar4 __attribute__((kernel)) selectiveAdjust(const uchar4 in, uint32_t x, + uint32_t y) { + float4 pixel = rsUnpackColor8888(in); + + float4 wsum = pixel; + int hue = rgb2hue(in); + + float t = satLut[hue]; + pixel.xyz = rsMatrixMultiply(&colorMatrix_min ,pixel.xyz) * (1 - t) + + t * (rsMatrixMultiply(&colorMatrix_max ,pixel.xyz)); + + pixel.a = 1.0f; + return rsPackColorTo8888(clamp(pixel, 0.f, 1.0f)); +}
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