libcopybit/copybit.cpp

/*
 * Copyright (C) 2008 The Android Open Source Project
 * Copyright (c) 2010 - 2014, The Linux Foundation. All rights reserved.
 *
 * Not a Contribution, Apache license notifications and license are retained
 * for attribution purposes only.
 *
 * 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 <cutils/log.h>

#include <linux/msm_mdp.h>
#include <linux/fb.h>

#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/mman.h>

#include <copybit.h>

#include "gralloc_priv.h"
#include "software_converter.h"

#define DEBUG_MDP_ERRORS 1

/******************************************************************************/

#define MAX_SCALE_FACTOR    (4)
#define MAX_DIMENSION       (4096)

/******************************************************************************/
struct blitReq{
    struct  mdp_buf_sync sync;
    uint32_t count;
    struct mdp_blit_req req[10];
};

/** State information for each device instance */
struct copybit_context_t {
    struct copybit_device_t device;
    int     mFD;
    uint8_t mAlpha;
    int     mFlags;
    bool    mBlitToFB;
    int     acqFence[MDP_MAX_FENCE_FD];
    int     relFence;
    struct  mdp_buf_sync sync;
    struct  blitReq list;
};

/**
 * Common hardware methods
 */

static int open_copybit(const struct hw_module_t* module, const char* name,
                        struct hw_device_t** device);

static struct hw_module_methods_t copybit_module_methods = {
open:  open_copybit
};

/*
 * The COPYBIT Module
 */
struct copybit_module_t HAL_MODULE_INFO_SYM = {
common: {
tag: HARDWARE_MODULE_TAG,
     version_major: 1,
     version_minor: 0,
     id: COPYBIT_HARDWARE_MODULE_ID,
     name: "QCT MSM7K COPYBIT Module",
     author: "Google, Inc.",
     methods: &copybit_module_methods
        }
};

/******************************************************************************/

/** min of int a, b */
static inline int min(int a, int b) {
    return (a<b) ? a : b;
}

/** max of int a, b */
static inline int max(int a, int b) {
    return (a>b) ? a : b;
}

/** scale each parameter by mul/div. Assume div isn't 0 */
static inline void MULDIV(uint32_t *a, uint32_t *b, int mul, int div) {
    if (mul != div) {
        *a = (mul * *a) / div;
        *b = (mul * *b) / div;
    }
}

/** Determine the intersection of lhs & rhs store in out */
static void intersect(struct copybit_rect_t *out,
                      const struct copybit_rect_t *lhs,
                      const struct copybit_rect_t *rhs) {
    out->l = max(lhs->l, rhs->l);
    out->t = max(lhs->t, rhs->t);
    out->r = min(lhs->r, rhs->r);
    out->b = min(lhs->b, rhs->b);
}

/** convert COPYBIT_FORMAT to MDP format */
static int get_format(int format) {
    switch (format) {
        case HAL_PIXEL_FORMAT_RGB_565:       return MDP_RGB_565;
        case HAL_PIXEL_FORMAT_RGBX_8888:     return MDP_RGBX_8888;
        case HAL_PIXEL_FORMAT_BGRX_8888:     return MDP_BGRX_8888;
        case HAL_PIXEL_FORMAT_RGB_888:       return MDP_RGB_888;
        case HAL_PIXEL_FORMAT_RGBA_8888:     return MDP_RGBA_8888;
        case HAL_PIXEL_FORMAT_BGRA_8888:     return MDP_BGRA_8888;
        case HAL_PIXEL_FORMAT_YCrCb_422_I:   return MDP_YCRYCB_H2V1;
        case HAL_PIXEL_FORMAT_YCbCr_422_I:   return MDP_YCBYCR_H2V1;
        case HAL_PIXEL_FORMAT_YCrCb_422_SP:  return MDP_Y_CRCB_H2V1;
        case HAL_PIXEL_FORMAT_YCrCb_420_SP:  return MDP_Y_CRCB_H2V2;
        case HAL_PIXEL_FORMAT_YCbCr_422_SP:  return MDP_Y_CBCR_H2V1;
        case HAL_PIXEL_FORMAT_YCbCr_420_SP:  return MDP_Y_CBCR_H2V2;
        case HAL_PIXEL_FORMAT_YCrCb_420_SP_ADRENO: return MDP_Y_CBCR_H2V2_ADRENO;
        case HAL_PIXEL_FORMAT_YCbCr_420_SP_VENUS: return MDP_Y_CBCR_H2V2_VENUS;
        case HAL_PIXEL_FORMAT_NV12_ENCODEABLE: return MDP_Y_CBCR_H2V2;
    }
    return -1;
}

/** convert from copybit image to mdp image structure */
static void set_image(struct mdp_img *img, const struct copybit_image_t *rhs)
{
    private_handle_t* hnd = (private_handle_t*)rhs->handle;
    if(hnd == NULL){
        ALOGE("copybit: Invalid handle");
        return;
    }
    img->width      = rhs->w;
    img->height     = rhs->h;
    img->format     = get_format(rhs->format);
    img->offset     = (uint32_t)hnd->offset;
    img->memory_id  = hnd->fd;
}
/** setup rectangles */
static void set_rects(struct copybit_context_t *dev,
                      struct mdp_blit_req *e,
                      const struct copybit_rect_t *dst,
                      const struct copybit_rect_t *src,
                      const struct copybit_rect_t *scissor) {
    struct copybit_rect_t clip;
    intersect(&clip, scissor, dst);

    e->dst_rect.x  = clip.l;
    e->dst_rect.y  = clip.t;
    e->dst_rect.w  = clip.r - clip.l;
    e->dst_rect.h  = clip.b - clip.t;

    uint32_t W, H, delta_x, delta_y;
    if (dev->mFlags & COPYBIT_TRANSFORM_ROT_90) {
        delta_x = (clip.t - dst->t);
        delta_y = (dst->r - clip.r);
        e->src_rect.w = (clip.b - clip.t);
        e->src_rect.h = (clip.r - clip.l);
        W = dst->b - dst->t;
        H = dst->r - dst->l;
    } else {
        delta_x  = (clip.l - dst->l);
        delta_y  = (clip.t - dst->t);
        e->src_rect.w  = (clip.r - clip.l);
        e->src_rect.h  = (clip.b - clip.t);
        W = dst->r - dst->l;
        H = dst->b - dst->t;
    }

    MULDIV(&delta_x, &e->src_rect.w, src->r - src->l, W);
    MULDIV(&delta_y, &e->src_rect.h, src->b - src->t, H);

    e->src_rect.x = delta_x + src->l;
    e->src_rect.y = delta_y + src->t;

    if (dev->mFlags & COPYBIT_TRANSFORM_FLIP_V) {
        if (dev->mFlags & COPYBIT_TRANSFORM_ROT_90) {
            e->src_rect.x = (src->l + src->r) - (e->src_rect.x + e->src_rect.w);
        }else{
            e->src_rect.y = (src->t + src->b) - (e->src_rect.y + e->src_rect.h);
        }
    }

    if (dev->mFlags & COPYBIT_TRANSFORM_FLIP_H) {
        if (dev->mFlags & COPYBIT_TRANSFORM_ROT_90) {
            e->src_rect.y = (src->t + src->b) - (e->src_rect.y + e->src_rect.h);
        }else{
            e->src_rect.x = (src->l + src->r) - (e->src_rect.x + e->src_rect.w);
        }
    }
}

/** setup mdp request */
static void set_infos(struct copybit_context_t *dev,
                      struct mdp_blit_req *req, int flags)
{
    req->alpha = dev->mAlpha;
    req->transp_mask = MDP_TRANSP_NOP;
    req->flags = dev->mFlags | flags;
    // check if we are blitting to f/b
    if (COPYBIT_ENABLE == dev->mBlitToFB) {
        req->flags |= MDP_MEMORY_ID_TYPE_FB;
    }
#if defined(COPYBIT_QSD8K)
    req->flags |= MDP_BLEND_FG_PREMULT;
#endif
}

/** copy the bits */
static int msm_copybit(struct copybit_context_t *dev, void const *list)
{
    int err;
    if (dev->relFence != -1) {
        close(dev->relFence);
        dev->relFence = -1;
    }
    err = ioctl(dev->mFD, MSMFB_ASYNC_BLIT,
                    (struct mdp_async_blit_req_list const*)list);
    ALOGE_IF(err<0, "copyBits failed (%s)", strerror(errno));
    if (err == 0) {
        return 0;
    } else {
#if DEBUG_MDP_ERRORS
        struct mdp_async_blit_req_list const* l =
            (struct mdp_async_blit_req_list const*)list;
        for (unsigned int i=0 ; i<l->count ; i++) {
            ALOGE("%d: src={w=%d, h=%d, f=%d, rect={%d,%d,%d,%d}}\n"
                  "    dst={w=%d, h=%d, f=%d, rect={%d,%d,%d,%d}}\n"
                  "    flags=%08x"
                  ,
                  i,
                  l->req[i].src.width,
                  l->req[i].src.height,
                  l->req[i].src.format,
                  l->req[i].src_rect.x,
                  l->req[i].src_rect.y,
                  l->req[i].src_rect.w,
                  l->req[i].src_rect.h,
                  l->req[i].dst.width,
                  l->req[i].dst.height,
                  l->req[i].dst.format,
                  l->req[i].dst_rect.x,
                  l->req[i].dst_rect.y,
                  l->req[i].dst_rect.w,
                  l->req[i].dst_rect.h,
                  l->req[i].flags
                 );
        }
#endif
        return -errno;
    }
}

/*****************************************************************************/

/** Set a parameter to value */
static int set_parameter_copybit(
    struct copybit_device_t *dev,
    int name,
    int value)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    int status = 0;
    if (ctx) {
        switch(name) {
            case COPYBIT_ROTATION_DEG:
                switch (value) {
                    case 0:
                        ctx->mFlags &= ~0x7;
                        break;
                    case 90:
                        ctx->mFlags &= ~0x7;
                        ctx->mFlags |= MDP_ROT_90;
                        break;
                    case 180:
                        ctx->mFlags &= ~0x7;
                        ctx->mFlags |= MDP_ROT_180;
                        break;
                    case 270:
                        ctx->mFlags &= ~0x7;
                        ctx->mFlags |= MDP_ROT_270;
                        break;
                    default:
                        ALOGE("Invalid value for COPYBIT_ROTATION_DEG");
                        status = -EINVAL;
                        break;
                }
                break;
            case COPYBIT_PLANE_ALPHA:
                if (value < 0)      value = MDP_ALPHA_NOP;
                if (value >= 256)   value = 255;
                ctx->mAlpha = (uint8_t)value;
                break;
            case COPYBIT_DITHER:
                if (value == COPYBIT_ENABLE) {
                    ctx->mFlags |= MDP_DITHER;
                } else if (value == COPYBIT_DISABLE) {
                    ctx->mFlags &= ~MDP_DITHER;
                }
                break;
            case COPYBIT_BLUR:
                if (value == COPYBIT_ENABLE) {
                    ctx->mFlags |= MDP_BLUR;
                } else if (value == COPYBIT_DISABLE) {
                    ctx->mFlags &= ~MDP_BLUR;
                }
                break;
            case COPYBIT_BLEND_MODE:
                if(value == COPYBIT_BLENDING_PREMULT) {
                    ctx->mFlags |= MDP_BLEND_FG_PREMULT;
                } else {
                    ctx->mFlags &= ~MDP_BLEND_FG_PREMULT;
                }
                break;
            case COPYBIT_TRANSFORM:
                ctx->mFlags &= ~0x7;
                ctx->mFlags |= value & 0x7;
                break;
            case COPYBIT_BLIT_TO_FRAMEBUFFER:
                if (COPYBIT_ENABLE == value) {
                    ctx->mBlitToFB = value;
                } else if (COPYBIT_DISABLE == value) {
                    ctx->mBlitToFB = value;
                } else {
                    ALOGE ("%s:Invalid input for COPYBIT_BLIT_TO_FRAMEBUFFER : %d",
                            __FUNCTION__, value);
                }
                break;
            case COPYBIT_FG_LAYER:
                if(value == COPYBIT_ENABLE) {
                     ctx->mFlags |= MDP_IS_FG;
                } else if (value == COPYBIT_DISABLE) {
                    ctx->mFlags &= ~MDP_IS_FG;
                }
                break ;
            default:
                status = -EINVAL;
                break;
        }
    } else {
        status = -EINVAL;
    }
    return status;
}

/** Get a static info value */
static int get(struct copybit_device_t *dev, int name)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    int value;
    if (ctx) {
        switch(name) {
            case COPYBIT_MINIFICATION_LIMIT:
                value = MAX_SCALE_FACTOR;
                break;
            case COPYBIT_MAGNIFICATION_LIMIT:
                value = MAX_SCALE_FACTOR;
                break;
            case COPYBIT_SCALING_FRAC_BITS:
                value = 32;
                break;
            case COPYBIT_ROTATION_STEP_DEG:
                value = 90;
                break;
            default:
                value = -EINVAL;
        }
    } else {
        value = -EINVAL;
    }
    return value;
}

static int set_sync_copybit(struct copybit_device_t *dev,
    int acquireFenceFd)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    if (acquireFenceFd != -1) {
        if (ctx->list.sync.acq_fen_fd_cnt < (MDP_MAX_FENCE_FD - 1)) {
            ctx->acqFence[ctx->list.sync.acq_fen_fd_cnt++] = acquireFenceFd;
        } else {
            int ret = -EINVAL;
            struct blitReq *list = &ctx->list;

            // Since fence is full kick off what is already in the list
            ret = msm_copybit(ctx, list);
            if (ret < 0) {
                ALOGE("%s: Blit call failed", __FUNCTION__);
                return -EINVAL;
            }
            list->count = 0;
            list->sync.acq_fen_fd_cnt = 0;
            ctx->acqFence[list->sync.acq_fen_fd_cnt++] = acquireFenceFd;
        }
    }
    return 0;
}

/** do a stretch blit type operation */
static int stretch_copybit(
    struct copybit_device_t *dev,
    struct copybit_image_t const *dst,
    struct copybit_image_t const *src,
    struct copybit_rect_t const *dst_rect,
    struct copybit_rect_t const *src_rect,
    struct copybit_region_t const *region)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    struct blitReq *list;
    int status = 0;
    private_handle_t *yv12_handle = NULL;

    if (ctx) {
        list = &ctx->list;

        if (ctx->mAlpha < 255) {
            switch (src->format) {
                // we don't support plane alpha with RGBA formats
                case HAL_PIXEL_FORMAT_RGBA_8888:
                case HAL_PIXEL_FORMAT_BGRA_8888:
                    ALOGE ("%s : Unsupported Pixel format %d", __FUNCTION__,
                           src->format);
                    return -EINVAL;
            }
        }

        if (src_rect->l < 0 || (uint32_t)src_rect->r > src->w ||
            src_rect->t < 0 || (uint32_t)src_rect->b > src->h) {
            // this is always invalid
            ALOGE ("%s : Invalid source rectangle : src_rect l %d t %d r %d b %d",\
                   __FUNCTION__, src_rect->l, src_rect->t, src_rect->r, src_rect->b);

            return -EINVAL;
        }

        if (src->w > MAX_DIMENSION || src->h > MAX_DIMENSION) {
            ALOGE ("%s : Invalid source dimensions w %d h %d", __FUNCTION__, src->w, src->h);
            return -EINVAL;
        }

        if (dst->w > MAX_DIMENSION || dst->h > MAX_DIMENSION) {
            ALOGE ("%s : Invalid DST dimensions w %d h %d", __FUNCTION__, dst->w, dst->h);
            return -EINVAL;
        }

        if(src->format ==  HAL_PIXEL_FORMAT_YV12) {
            int usage =
            GRALLOC_USAGE_PRIVATE_IOMMU_HEAP | GRALLOC_USAGE_PRIVATE_UNCACHED;
            if (0 == alloc_buffer(&yv12_handle,src->w,src->h,
                                  src->format, usage)){
                if(0 == convertYV12toYCrCb420SP(src,yv12_handle)){
                    (const_cast<copybit_image_t *>(src))->format =
                        HAL_PIXEL_FORMAT_YCrCb_420_SP;
                    (const_cast<copybit_image_t *>(src))->handle =
                        yv12_handle;
                    (const_cast<copybit_image_t *>(src))->base =
                        (void *)yv12_handle->base;
                }
                else{
                    ALOGE("Error copybit conversion from yv12 failed");
                    if(yv12_handle)
                        free_buffer(yv12_handle);
                    return -EINVAL;
                }
            }
            else{
                ALOGE("Error:unable to allocate memeory for yv12 software conversion");
                return -EINVAL;
            }
        }
        const uint32_t maxCount =
                (uint32_t)(sizeof(list->req)/sizeof(list->req[0]));
        const struct copybit_rect_t bounds = { 0, 0, (int)dst->w, (int)dst->h };
        struct copybit_rect_t clip;
        status = 0;
        while ((status == 0) && region->next(region, &clip)) {
            intersect(&clip, &bounds, &clip);
            mdp_blit_req* req = &list->req[list->count];
            int flags = 0;

            private_handle_t* src_hnd = (private_handle_t*)src->handle;
            if(src_hnd != NULL && src_hnd->flags & private_handle_t::PRIV_FLAGS_DO_NOT_FLUSH) {
                flags |=  MDP_BLIT_NON_CACHED;
            }

            set_infos(ctx, req, flags);
            set_image(&req->dst, dst);
            set_image(&req->src, src);
            set_rects(ctx, req, dst_rect, src_rect, &clip);

            if (req->src_rect.w<=0 || req->src_rect.h<=0)
                continue;

            if (req->dst_rect.w<=0 || req->dst_rect.h<=0)
                continue;

            if (++list->count == maxCount) {
                status = msm_copybit(ctx, list);
                list->sync.acq_fen_fd_cnt = 0;
                list->count = 0;
            }
        }
        if(yv12_handle) {
            //Before freeing the buffer we need buffer passed through blit call
            if (list->count != 0) {
                status = msm_copybit(ctx, list);
                list->sync.acq_fen_fd_cnt = 0;
                list->count = 0;
            }
            free_buffer(yv12_handle);
        }
    } else {
        ALOGE ("%s : Invalid COPYBIT context", __FUNCTION__);
        status = -EINVAL;
    }
    return status;
}

/** Perform a blit type operation */
static int blit_copybit(
    struct copybit_device_t *dev,
    struct copybit_image_t const *dst,
    struct copybit_image_t const *src,
    struct copybit_region_t const *region)
{
    struct copybit_rect_t dr = { 0, 0, (int)dst->w, (int)dst->h };
    struct copybit_rect_t sr = { 0, 0, (int)src->w, (int)src->h };
    return stretch_copybit(dev, dst, src, &dr, &sr, region);
}

static int finish_copybit(struct copybit_device_t *dev)
{
    // NOP for MDP copybit
    if(!dev)
       return -EINVAL;

    return 0;
}
static int clear_copybit(struct copybit_device_t *dev,
                         struct copybit_image_t const *buf,
                         struct copybit_rect_t *rect)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    uint32_t color = 0; // black color

    if (!ctx) {
        ALOGE ("%s: Invalid copybit context", __FUNCTION__);
        return -EINVAL;
    }

    struct blitReq list1;
    memset((char *)&list1 , 0 ,sizeof (struct blitReq) );
    list1.count = 1;
    int rel_fen_fd = -1;
    int my_tmp_get_fence = -1;

    list1.sync.acq_fen_fd  =  ctx->acqFence;
    list1.sync.rel_fen_fd  =  &my_tmp_get_fence;
    list1.sync.acq_fen_fd_cnt = ctx->list.sync.acq_fen_fd_cnt;
    mdp_blit_req* req = &list1.req[0];

    if(!req) {
        ALOGE ("%s : Invalid request", __FUNCTION__);
        return -EINVAL;
    }

    set_image(&req->dst, buf);
    set_image(&req->src, buf);

    if (rect->l < 0 || (uint32_t)(rect->r - rect->l) > req->dst.width ||
       rect->t < 0 || (uint32_t)(rect->b - rect->t) > req->dst.height) {
       ALOGE ("%s : Invalid rect : src_rect l %d t %d r %d b %d",\
       __FUNCTION__, rect->l, rect->t, rect->r, rect->b);
       return -EINVAL;
    }

    req->dst_rect.x  = rect->l;
    req->dst_rect.y  = rect->t;
    req->dst_rect.w  = rect->r - rect->l;
    req->dst_rect.h  = rect->b - rect->t;

    req->src_rect = req->dst_rect;

    req->const_color.b = (uint32_t)((color >> 16) & 0xff);
    req->const_color.g = (uint32_t)((color >> 8) & 0xff);
    req->const_color.r = (uint32_t)((color >> 0) & 0xff);
    req->const_color.alpha = MDP_ALPHA_NOP;

    req->transp_mask = MDP_TRANSP_NOP;
    req->flags = MDP_SOLID_FILL | MDP_MEMORY_ID_TYPE_FB | MDP_BLEND_FG_PREMULT;
    int status = msm_copybit(ctx, &list1);

    ctx->list.sync.acq_fen_fd_cnt = 0;
    if (my_tmp_get_fence !=  -1)
        close(my_tmp_get_fence);

    return status;
}

/** Fill the rect on dst with RGBA color **/
static int fill_color(struct copybit_device_t *dev,
                      struct copybit_image_t const *dst,
                      struct copybit_rect_t const *rect,
                      uint32_t color)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    if (!ctx) {
        ALOGE("%s: Invalid copybit context", __FUNCTION__);
        return -EINVAL;
    }

    if (dst->w > MAX_DIMENSION || dst->h > MAX_DIMENSION) {
        ALOGE("%s: Invalid DST w=%d h=%d", __FUNCTION__, dst->w, dst->h);
        return -EINVAL;
    }

    if (rect->l < 0 || (uint32_t)(rect->r - rect->l) > dst->w ||
        rect->t < 0 || (uint32_t)(rect->b - rect->t) > dst->h) {
        ALOGE("%s: Invalid destination rect: l=%d t=%d r=%d b=%d",
                __FUNCTION__, rect->l, rect->t, rect->r, rect->b);
        return -EINVAL;
    }

    int status = 0;
    struct blitReq* list = &ctx->list;
    mdp_blit_req* req = &list->req[list->count++];
    set_infos(ctx, req, MDP_SOLID_FILL);
    set_image(&req->src, dst);
    set_image(&req->dst, dst);

    req->dst_rect.x = rect->l;
    req->dst_rect.y = rect->t;
    req->dst_rect.w = rect->r - rect->l;
    req->dst_rect.h = rect->b - rect->t;
    req->src_rect = req->dst_rect;

    req->const_color.r = (uint32_t)((color >> 0) & 0xff);
    req->const_color.g = (uint32_t)((color >> 8) & 0xff);
    req->const_color.b = (uint32_t)((color >> 16) & 0xff);
    req->const_color.alpha = (uint32_t)((color >> 24) & 0xff);

    if (list->count == sizeof(list->req)/sizeof(list->req[0])) {
        status = msm_copybit(ctx, list);
        list->sync.acq_fen_fd_cnt = 0;
        list->count = 0;
    }
    return status;
}

/*****************************************************************************/

/** Close the copybit device */
static int close_copybit(struct hw_device_t *dev)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    if (ctx) {
        close(ctx->mFD);
        free(ctx);
    }
    return 0;
}

static int flush_get_fence(struct copybit_device_t *dev, int* fd)
{
    struct copybit_context_t* ctx = (struct copybit_context_t*)dev;
    struct blitReq *list = &ctx->list;
    int ret = -EINVAL;

    if (list->count) {
        ret = msm_copybit(ctx, list);
        if (ret < 0)
            ALOGE("%s: Blit call failed", __FUNCTION__);
        list->count = 0;
    }
    *fd = ctx->relFence;
    list->sync.acq_fen_fd_cnt = 0;
    ctx->relFence = -1;
    return ret;
}

/** Open a new instance of a copybit device using name */
static int open_copybit(const struct hw_module_t* module, const char* name,
                        struct hw_device_t** device)
{
    int status = -EINVAL;

    if (!strcmp(name, COPYBIT_HARDWARE_COPYBIT0)) {
        return COPYBIT_FAILURE;
    }
    copybit_context_t *ctx;
    ctx = (copybit_context_t *)malloc(sizeof(copybit_context_t));
    memset(ctx, 0, sizeof(*ctx));

    ctx->device.common.tag = HARDWARE_DEVICE_TAG;
    ctx->device.common.version = 1;
    ctx->device.common.module = const_cast<hw_module_t*>(module);
    ctx->device.common.close = close_copybit;
    ctx->device.set_parameter = set_parameter_copybit;
    ctx->device.get = get;
    ctx->device.blit = blit_copybit;
    ctx->device.set_sync = set_sync_copybit;
    ctx->device.stretch = stretch_copybit;
    ctx->device.finish = finish_copybit;
    ctx->device.fill_color = fill_color;
    ctx->device.flush_get_fence = flush_get_fence;
    ctx->device.clear = clear_copybit;
    ctx->mAlpha = MDP_ALPHA_NOP;
    ctx->mFlags = 0;
    ctx->sync.flags = 0;
    ctx->relFence = -1;
    for (int i=0; i < MDP_MAX_FENCE_FD; i++) {
        ctx->acqFence[i] = -1;
    }
    ctx->sync.acq_fen_fd = ctx->acqFence;
    ctx->sync.rel_fen_fd = &ctx->relFence;
    ctx->list.count = 0;
    ctx->list.sync.acq_fen_fd_cnt = 0;
    ctx->list.sync.rel_fen_fd = ctx->sync.rel_fen_fd;
    ctx->list.sync.acq_fen_fd = ctx->sync.acq_fen_fd;
    ctx->mFD = open("/dev/graphics/fb0", O_RDWR, 0);
    if (ctx->mFD < 0) {
        status = errno;
        ALOGE("Error opening frame buffer errno=%d (%s)",
              status, strerror(status));
        status = -status;
    } else {
        status = 0;
        *device = &ctx->device.common;
    }
    return status;
}