Copybit HAL模块分析报告.doc

Copybit HAL模块分析报告Rockie C1、copybit模块的继承关系图2、copybit模块支持的图像格式注意，并不是所有硬件都支持这么多格式 COPYBIT_FORMAT_RGBA_8888 = HAL_PIXEL_FORMAT_RGBA_8888, COPYBIT_FORMAT_RGBX_8888 = HAL_PIXEL_FORMAT_RGBX_8888, COPYBIT_FORMAT_RGB_888 = HAL_PIXEL_FORMAT_RGB_888, COPYBIT_FORMAT_RGB_565 = HAL_PIXEL_FORMAT_RGB_565, COPYBIT_FORMAT_BGRA_8888 = HAL_PIXEL_FORMAT_BGRA_8888, COPYBIT_FORMAT_RGBA_5551 = HAL_PIXEL_FORMAT_RGBA_5551, COPYBIT_FORMAT_RGBA_4444 = HAL_PIXEL_FORMAT_RGBA_4444, COPYBIT_FORMAT_YCbCr_422_SP = HAL_PIXEL_FORMAT_YCbCr_422_SP,COPYBIT_FORMAT_YCbCr_420_SP = HAL_PIXEL_FORMAT_YCbCr_420_SP,3、copybit支持的功能* 图像旋转 90、180、270、水平翻转、垂直翻转* Alpha Blending 数值范围0-255* 抖动* 透明* 模糊* 剪裁* Stretch（缩放）* Bit Blit（块拷贝，支持xy坐标）4、图像结构体struct copybit_image_t /* width 宽度*/ uint32_t w; /* height 高度 */ uint32_t h; /* format COPYBIT_FORMAT_xxx格式 */ int32_t format; /* base of buffer with image 基址*/ void *base; /* handle to the image 图像句柄，Native_handle.h (systemcoreincludecutils)中定义*/ native_handle_t* handle;5、copybit模块支持的函数接口（1）设置参数int (*set_parameter)(struct copybit_device_t *dev, int name, int value);（2）获取信息int (*get)(struct copybit_device_t *dev, int name);（3）Blit操作int (*blit)(struct copybit_device_t *dev,struct copybit_image_t const *dst,struct copybit_image_t const *src,struct copybit_region_t const *region);（4）Stretch操作int (*stretch)(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);高通Copybit 模块 HAL分析1、Copybit Module写法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: ©bit_module_methods ;2、私有函数（1）min(int a, int b)（2）max(int a, int b)（3）void MULDIV(uint32_t *a, uint32_t *b, int mul, int div)（4）void intersect(struct copybit_rect_t *out, const struct copybit_rect_t *lhs, const struct copybit_rect_t *rhs)作用：Clip函数（5）get_format(int format)作用：获取图形格式（6）void set_image(struct mdp_img *img, const struct copybit_image_t *rhs)作用：将Copybitimage结构体转换为mdp image结构（7）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)作用：设置矩形框（8）void set_infos(struct copybit_context_t *dev, struct mdp_blit_req *req)作用：设置mdp请求（9）int msm_copybit(struct copybit_context_t *dev, void const *list)作用：执行copybit操作3、共有函数（1）int set_parameter_copybit( struct copybit_device_t *dev, int name, int value)作用：设置参数参数类型： 旋转 0 90 180 270 Alpha 0-255 抖动 使能/禁止 模糊 使能/禁止 透明 0-7(2) int get(struct copybit_device_t *dev, int name)作用：获取固定参数参数：最小缩放小数位4-msm7k 8-msm8k最大缩放小数位4-msm7k 8-msm8kCopybit缩放小数位32Copybit旋转步进角度（90）（3）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)作用，做stretch 和blit操作通过一个while循环，积攒12个region，一次调用硬件驱动ioctl函数，将数据传入驱动，进行stretch操作。（4）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)作用：该操作没有stretch操作4、高通驱动中的不足之处：查看内核2D驱动可知，MSM7k的做法是将buffer数据通过copy from user函数复制到内核态，再