/*
 * Copyright (C) 2012 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 "rsdCore.h"
#include "rsdIntrinsics.h"
#include "rsdAllocation.h"

#include "rsdIntrinsicInlines.h"

using namespace android;
using namespace android::renderscript;

struct ConvolveParams {
    float fp[28];
    short ip[28];
    ObjectBaseRef<Allocation> alloc;
};

static void Convolve5x5_Bind(const Context *dc, const Script *script,
                             void * intrinsicData, uint32_t slot, Allocation *data) {
    ConvolveParams *cp = (ConvolveParams *)intrinsicData;
    rsAssert(slot == 1);
    cp->alloc.set(data);
}

static void Convolve5x5_SetVar(const Context *dc, const Script *script, void * intrinsicData,
                               uint32_t slot, void *data, size_t dataLength) {
    ConvolveParams *cp = (ConvolveParams *)intrinsicData;

    rsAssert(slot == 0);
    memcpy (cp->fp, data, dataLength);
    for(int ct=0; ct < 25; ct++) {
        cp->ip[ct] = (short)(cp->fp[ct] * 255.f + 0.5f);
    }
}


static void One(const RsForEachStubParamStruct *p, uint32_t x, uchar4 *out,
                const uchar4 *py0, const uchar4 *py1, const uchar4 *py2, const uchar4 *py3, const uchar4 *py4,
                const float* coeff) {

    uint32_t x0 = rsMax((int32_t)x-2, 0);
    uint32_t x1 = rsMax((int32_t)x-1, 0);
    uint32_t x2 = x;
    uint32_t x3 = rsMin((int32_t)x+1, (int32_t)(p->dimX-1));
    uint32_t x4 = rsMin((int32_t)x+2, (int32_t)(p->dimX-1));

    float4 px = convert_float4(py0[x0]) * coeff[0] +
                convert_float4(py0[x1]) * coeff[1] +
                convert_float4(py0[x2]) * coeff[2] +
                convert_float4(py0[x3]) * coeff[3] +
                convert_float4(py0[x4]) * coeff[4] +

                convert_float4(py1[x0]) * coeff[5] +
                convert_float4(py1[x1]) * coeff[6] +
                convert_float4(py1[x2]) * coeff[7] +
                convert_float4(py1[x3]) * coeff[8] +
                convert_float4(py1[x4]) * coeff[9] +

                convert_float4(py2[x0]) * coeff[10] +
                convert_float4(py2[x1]) * coeff[11] +
                convert_float4(py2[x2]) * coeff[12] +
                convert_float4(py2[x3]) * coeff[13] +
                convert_float4(py2[x4]) * coeff[14] +

                convert_float4(py3[x0]) * coeff[15] +
                convert_float4(py3[x1]) * coeff[16] +
                convert_float4(py3[x2]) * coeff[17] +
                convert_float4(py3[x3]) * coeff[18] +
                convert_float4(py3[x4]) * coeff[19] +

                convert_float4(py4[x0]) * coeff[20] +
                convert_float4(py4[x1]) * coeff[21] +
                convert_float4(py4[x2]) * coeff[22] +
                convert_float4(py4[x3]) * coeff[23] +
                convert_float4(py4[x4]) * coeff[24];

    px = clamp(px, 0.f, 255.f);
    uchar4 o = {(uchar)px.x, (uchar)px.y, (uchar)px.z, (uchar)px.w};
    *out = o;
}

extern "C" void rsdIntrinsicConvolve5x5_K(void *dst, const void *y0, const void *y1,
                                          const void *y2, const void *y3, const void *y4,
                                          const short *coef, uint32_t count);

static void Convolve5x5_uchar4(const RsForEachStubParamStruct *p,
                                    uint32_t xstart, uint32_t xend,
                                    uint32_t instep, uint32_t outstep) {
    ConvolveParams *cp = (ConvolveParams *)p->usr;
    if (!cp->alloc.get()) {
        ALOGE("Convolve5x5 executed without input, skipping");
        return;
    }
    DrvAllocation *din = (DrvAllocation *)cp->alloc->mHal.drv;
    const uchar *pin = (const uchar *)din->lod[0].mallocPtr;

    uint32_t y0 = rsMax((int32_t)p->y-2, 0);
    uint32_t y1 = rsMax((int32_t)p->y-1, 0);
    uint32_t y2 = p->y;
    uint32_t y3 = rsMin((int32_t)p->y+1, (int32_t)(p->dimY-1));
    uint32_t y4 = rsMin((int32_t)p->y+2, (int32_t)(p->dimY-1));

    const uchar4 *py0 = (const uchar4 *)(pin + din->lod[0].stride * y0);
    const uchar4 *py1 = (const uchar4 *)(pin + din->lod[0].stride * y1);
    const uchar4 *py2 = (const uchar4 *)(pin + din->lod[0].stride * y2);
    const uchar4 *py3 = (const uchar4 *)(pin + din->lod[0].stride * y3);
    const uchar4 *py4 = (const uchar4 *)(pin + din->lod[0].stride * y4);

    uchar4 *out = (uchar4 *)p->out;
    uint32_t x1 = xstart;
    uint32_t x2 = xend;

    while((x1 < x2) && (x1 < 2)) {
        One(p, x1, out, py0, py1, py2, py3, py4, cp->fp);
        out++;
        x1++;
    }

#if defined(ARCH_ARM_HAVE_NEON)
    if((x1 + 3) < x2) {
        uint32_t len = (x2 - x1 - 3) >> 1;
        rsdIntrinsicConvolve5x5_K(out, py0+x1-2, py1+x1-2, py2+x1-2, py3+x1-2, py4+x1-2, cp->ip, len);
        out += len << 1;
        x1 += len << 1;
    }
#endif

    while(x1 < x2) {
        One(p, x1, out, py0, py1, py2, py3, py4, cp->fp);
        out++;
        x1++;
    }
}

void * rsdIntrinsic_InitConvolve5x5(const android::renderscript::Context *dc,
                                    android::renderscript::Script *script,
                                    RsdIntriniscFuncs_t *funcs) {

    script->mHal.info.exportedVariableCount = 2;
    funcs->setVarObj = Convolve5x5_Bind;
    funcs->setVar = Convolve5x5_SetVar;
    funcs->root = Convolve5x5_uchar4;

    ConvolveParams *cp = (ConvolveParams *)calloc(1, sizeof(ConvolveParams));
    for(int ct=0; ct < 25; ct++) {
        cp->fp[ct] = 1.f / 25.f;
        cp->ip[ct] = (short)(cp->fp[ct] * 255.f + 0.5f);
    }
    return cp;
}