libhwcomposer/hwc_utils.h

/*
 * Copyright (C) 2010 The Android Open Source Project
 * Copyright (C) 2012, The Linux Foundation. All rights reserved.
 *
 * 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.
 */

#ifndef HWC_UTILS_H
#define HWC_UTILS_H

#define HWC_REMOVE_DEPRECATED_VERSIONS 1
#include <fcntl.h>
#include <hardware/hwcomposer.h>
#include <gr.h>
#include <gralloc_priv.h>

#define ALIGN_TO(x, align)     (((x) + ((align)-1)) & ~((align)-1))
#define LIKELY( exp )       (__builtin_expect( (exp) != 0, true  ))
#define UNLIKELY( exp )     (__builtin_expect( (exp) != 0, false ))
#define FINAL_TRANSFORM_MASK 0x000F
#define MAX_NUM_DISPLAYS 4 //Yes, this is ambitious
#define MAX_NUM_LAYERS 32

//Fwrd decls
struct hwc_context_t;
struct framebuffer_device_t;

namespace qService {
class QService;
}

namespace overlay {
class Overlay;
}

namespace qhwc {
//fwrd decl
class QueuedBufferStore;
class ExternalDisplay;

struct MDPInfo {
    int version;
    char panel;
    bool hasOverlay;
};

struct DisplayAttributes {
    uint32_t vsync_period; //nanos
    uint32_t xres;
    uint32_t yres;
    uint32_t stride;
    float xdpi;
    float ydpi;
    int fd;
    bool connected; //Applies only to pluggable disp.
    //Connected does not mean it ready to use.
    //It should be active also. (UNBLANKED)
    bool isActive;
};

struct ListStats {
    int numAppLayers; //Total - 1, excluding FB layer.
    int skipCount;
    int fbLayerIndex; //Always last for now. = numAppLayers
    //Video specific
    int yuvCount;
    int yuvIndex;
    bool needsAlphaScale;
};


struct LayerProp {
    uint32_t mFlags; //qcom specific layer flags
    LayerProp():mFlags(0) {};
};

// LayerProp::flag values
enum {
    HWC_MDPCOMP = 0x00000001,
};

class LayerCache {
    public:
    LayerCache() {
        canUseLayerCache = false;
        numHwLayers = 0;
        for(uint32_t i = 0; i < MAX_NUM_LAYERS; i++) {
            hnd[i] = NULL;
        }
    }
    //LayerCache optimization
    void updateLayerCache(hwc_display_contents_1_t* list);
    void resetLayerCache(int num);
    void markCachedLayersAsOverlay(hwc_display_contents_1_t* list);
    private:
    uint32_t numHwLayers;
    bool canUseLayerCache;
    buffer_handle_t hnd[MAX_NUM_LAYERS];

};




// -----------------------------------------------------------------------------
// Utility functions - implemented in hwc_utils.cpp
void dumpLayer(hwc_layer_1_t const* l);
void setListStats(hwc_context_t *ctx, const hwc_display_contents_1_t *list,
        int dpy);
void initContext(hwc_context_t *ctx);
void closeContext(hwc_context_t *ctx);
//Crops source buffer against destination and FB boundaries
void calculate_crop_rects(hwc_rect_t& crop, hwc_rect_t& dst,
        const int fbWidth, const int fbHeight, int orient);
bool isSecuring(hwc_context_t* ctx);
bool isExternalActive(hwc_context_t* ctx);

//Sync point impl.
int hwc_sync(hwc_context_t *ctx, hwc_display_contents_1_t* list, int dpy);

// Inline utility functions
static inline bool isSkipLayer(const hwc_layer_1_t* l) {
    return (UNLIKELY(l && (l->flags & HWC_SKIP_LAYER)));
}

// Returns true if the buffer is yuv
static inline bool isYuvBuffer(const private_handle_t* hnd) {
    return (hnd && (hnd->bufferType == BUFFER_TYPE_VIDEO));
}

// Returns true if the buffer is secure
static inline bool isSecureBuffer(const private_handle_t* hnd) {
    return (hnd && (private_handle_t::PRIV_FLAGS_SECURE_BUFFER & hnd->flags));
}
//Return true if buffer is marked locked
static inline bool isBufferLocked(const private_handle_t* hnd) {
    return (hnd && (private_handle_t::PRIV_FLAGS_HWC_LOCK & hnd->flags));
}

//Return true if buffer is for external display only
static inline bool isExtOnly(const private_handle_t* hnd) {
    return (hnd && (hnd->flags & private_handle_t::PRIV_FLAGS_EXTERNAL_ONLY));
}

//Return true if buffer is for external display only with a BLOCK flag.
static inline bool isExtBlock(const private_handle_t* hnd) {
    return (hnd && (hnd->flags & private_handle_t::PRIV_FLAGS_EXTERNAL_BLOCK));
}

//Return true if buffer is for external display only with a Close Caption flag.
static inline bool isExtCC(const private_handle_t* hnd) {
    return (hnd && (hnd->flags & private_handle_t::PRIV_FLAGS_EXTERNAL_CC));
}

// Initialize uevent thread
void init_uevent_thread(hwc_context_t* ctx);
// Initialize vsync thread
void init_vsync_thread(hwc_context_t* ctx);

inline void getLayerResolution(const hwc_layer_1_t* layer,
                               int& width, int& height)
{
    hwc_rect_t displayFrame  = layer->displayFrame;
    width = displayFrame.right - displayFrame.left;
    height = displayFrame.bottom - displayFrame.top;
}

static inline int openFb(int dpy) {
    int fd = -1;
    const char *devtmpl = "/dev/graphics/fb%u";
    char name[64] = {0};
    snprintf(name, 64, devtmpl, dpy);
    fd = open(name, O_RDWR);
    return fd;
}

template <class T>
inline void swap(T& a, T& b) {
    T tmp = a;
    a = b;
    b = tmp;
}

}; //qhwc namespace

struct vsync_state {
    pthread_mutex_t lock;
    pthread_cond_t  cond;
    bool enable;
};

// -----------------------------------------------------------------------------
// HWC context
// This structure contains overall state
struct hwc_context_t {
    hwc_composer_device_1_t device;
    const hwc_procs_t* proc;
    //Framebuffer device
    framebuffer_device_t *mFbDev;
    //Overlay object - NULL for non overlay devices
    overlay::Overlay *mOverlay;
    //QService object
    qService::QService *mQService;
    // External display related information
    qhwc::ExternalDisplay *mExtDisplay;
    qhwc::MDPInfo mMDP;
    qhwc::DisplayAttributes dpyAttr[HWC_NUM_DISPLAY_TYPES];
    qhwc::ListStats listStats[HWC_NUM_DISPLAY_TYPES];
    qhwc::LayerCache *mLayerCache;
    qhwc::LayerProp *layerProp[HWC_NUM_DISPLAY_TYPES];

    //Securing in progress indicator
    bool mSecuring;
    //Display in secure mode indicator
    bool mSecureMode;
    //Lock to prevent set from being called while blanking
    mutable Locker mBlankLock;
    //Lock to protect set when detaching external disp
    mutable Locker mExtSetLock;
    //Vsync
    struct vsync_state vstate;
};

#endif //HWC_UTILS_H