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/*
* Copyright (C) 2013 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.
*/
#include "ip.rsh"
rs_allocation gSrc;
rs_allocation gDest;
rs_allocation gSums;
rs_allocation gSum;
int gWidth;
int gHeight;
int gStep;
int gSteps;
void RS_KERNEL pass1(int in, uint x, uint y) {
for (int i=0; i < (256); i++) {
rsSetElementAt_int(gSums, 0, i, y);
}
for (int i = 0; i < gStep; i++) {
int py = y*gStep + i;
if (py >= gHeight) return;
for (int px=0; px < gWidth; px++) {
uchar4 c = rsGetElementAt_uchar4(gSrc, px, py);
int lum = (77 * c.r + 150 * c.g + 29 * c.b) >> 8;
int old = rsGetElementAt_int(gSums, lum, y);
rsSetElementAt_int(gSums, old+1, lum, y);
}
}
}
int RS_KERNEL pass2(uint x) {
int sum = 0;
for (int i=0; i < gSteps; i++) {
sum += rsGetElementAt_int(gSums, x, i);
}
return sum;
}
void rescale() {
int maxv = 0;
for (int i=0; i < 256; i++) {
maxv = max(maxv, rsGetElementAt_int(gSum, i));
}
float overMax = (1.f / maxv) * gHeight;
for (int i=0; i < 256; i++) {
int t = rsGetElementAt_int(gSum, i);
t = gHeight - (overMax * rsGetElementAt_int(gSum, i));
t = max(0, t);
rsSetElementAt_int(gSum, t, i);
}
}
static const uchar4 gClear = {0, 0, 0, 0xff};
uchar4 RS_KERNEL clear() {
return gClear;
}
uchar4 RS_KERNEL draw(uint x, uint y) {
int l = rsGetElementAt_int(gSum, x >> 2);
if (y > l) {
return 0xff;
}
return gClear;
}
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