| /* |
| * Copyright (C) 2014 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" |
| #pragma rs_fp_relaxed |
| |
| int32_t gWidthIn; |
| int32_t gHeightIn; |
| rs_allocation gIn; |
| float scale; |
| |
| |
| uchar4 __attribute__((kernel)) nearest(uint32_t x, uint32_t y) { |
| float xf = clamp(x * scale, 0.f, (float)gWidthIn - 1.f); |
| float yf = clamp(y * scale, 0.f, (float)gHeightIn - 1.f); |
| uint32_t ix = xf; |
| uint32_t iy = yf; |
| |
| uchar4 tmp = rsGetElementAt_uchar4(gIn, ix, iy); |
| tmp.a = 0xff; |
| return tmp; |
| } |
| |
| |
| static float4 cubicInterpolate (float4 p0,float4 p1,float4 p2,float4 p3 , float x) { |
| return p1 + 0.5f * x * (p2 - p0 + x * (2.f * p0 - 5.f * p1 + 4.f * p2 - p3 |
| + x * (3.f * (p1 - p2) + p3 - p0))); |
| } |
| |
| uchar4 __attribute__((kernel)) bicubic(uint32_t x, uint32_t y) { |
| float xf = (x + 0.5f) * scale - 0.5f; |
| float yf = (y + 0.5f) * scale - 0.5f; |
| |
| int startx = (int) floor(xf - 1); |
| int starty = (int) floor(yf - 1); |
| xf = xf - floor(xf); |
| yf = yf - floor(yf); |
| int maxx = gWidthIn - 1; |
| int maxy = gHeightIn - 1; |
| |
| uint32_t xs0 = (uint32_t) max(0, startx + 0); |
| uint32_t xs1 = (uint32_t) max(0, startx + 1); |
| uint32_t xs2 = (uint32_t) min(maxx, startx + 2); |
| uint32_t xs3 = (uint32_t) min(maxx, startx + 3); |
| |
| uint32_t ys0 = (uint32_t) max(0, starty + 0); |
| uint32_t ys1 = (uint32_t) max(0, starty + 1); |
| uint32_t ys2 = (uint32_t) min(maxy, starty + 2); |
| uint32_t ys3 = (uint32_t) min(maxy, starty + 3); |
| |
| float4 p00 = convert_float4(rsGetElementAt_uchar4(gIn, xs0, ys0)); |
| float4 p01 = convert_float4(rsGetElementAt_uchar4(gIn, xs1, ys0)); |
| float4 p02 = convert_float4(rsGetElementAt_uchar4(gIn, xs2, ys0)); |
| float4 p03 = convert_float4(rsGetElementAt_uchar4(gIn, xs3, ys0)); |
| float4 p0 = cubicInterpolate(p00, p01, p02, p03, xf); |
| |
| float4 p10 = convert_float4(rsGetElementAt_uchar4(gIn, xs0, ys1)); |
| float4 p11 = convert_float4(rsGetElementAt_uchar4(gIn, xs1, ys1)); |
| float4 p12 = convert_float4(rsGetElementAt_uchar4(gIn, xs2, ys1)); |
| float4 p13 = convert_float4(rsGetElementAt_uchar4(gIn, xs3, ys1)); |
| float4 p1 = cubicInterpolate(p10, p11, p12, p13, xf); |
| |
| float4 p20 = convert_float4(rsGetElementAt_uchar4(gIn, xs0, ys2)); |
| float4 p21 = convert_float4(rsGetElementAt_uchar4(gIn, xs1, ys2)); |
| float4 p22 = convert_float4(rsGetElementAt_uchar4(gIn, xs2, ys2)); |
| float4 p23 = convert_float4(rsGetElementAt_uchar4(gIn, xs3, ys2)); |
| float4 p2 = cubicInterpolate(p20, p21, p22, p23, xf); |
| |
| float4 p30 = convert_float4(rsGetElementAt_uchar4(gIn, xs0, ys3)); |
| float4 p31 = convert_float4(rsGetElementAt_uchar4(gIn, xs1, ys3)); |
| float4 p32 = convert_float4(rsGetElementAt_uchar4(gIn, xs2, ys3)); |
| float4 p33 = convert_float4(rsGetElementAt_uchar4(gIn, xs3, ys3)); |
| float4 p3 = cubicInterpolate(p30, p31, p32, p33, xf); |
| |
| float4 p = cubicInterpolate(p0, p1, p2, p3, yf); |
| p = clamp(p + 0.5f, 0.f, 255.f); |
| return convert_uchar4(p); |
| } |
| |