第第頁(yè)全志V85x內(nèi)G2D模塊實(shí)現(xiàn)圖片格式步驟方法G2D主要功能：

1）旋轉(zhuǎn)：支持90、180、270旋轉(zhuǎn)；

2）scale：放縮；

3）鏡像反轉(zhuǎn)：H/V；

4）透明疊加：實(shí)現(xiàn)兩個(gè)rgb圖片疊加；

5）格式轉(zhuǎn)換：yuv轉(zhuǎn)rgb等多種格式相互間轉(zhuǎn)換；

6）矩形填充，等諸多功能；

G2D配置

源碼目錄

（ti）na-v853-docker/kernel/（linux）-4.9/drivers/char/sunxi_g2d

makekernel_menuconfig配置

DeviceDrivers>Characterdevices>sunxig2ddriver

DeviceTree設(shè)備樹配置

sun8iw21p1.dtsi路徑：

tina-v853-docker/kernel/linux-4.9/arch/（arm）/boot/dts/sun8iw21p1.dtsi

g2d:g2d@05410000{compatible="allwinner,sunxi-g2d";reg=;interrupts=;clocks=

注：status要設(shè)定為“okay”狀態(tài)。

重新編譯內(nèi)核

使用燒錄工具PhoenixSuit將編譯打包好的img鏡像燒錄到開發(fā)板。

（ad）bshell打開控制終端查看設(shè)備節(jié)點(diǎn)G2D：

通過G2D設(shè)備節(jié)點(diǎn)進(jìn)行操作

staticintSampleG2d_G2dOpen(SAMPLE_G2D_CTX*p_g2d_ctx){intret=0;p_g2d_ctx->mG2dFd=open("/dev/g2d",O_RDWR,0);if(p_g2d_ctx->mG2dFd

G2Dsample具體應(yīng)用

G2Dsample目錄

進(jìn)行rotation，scale，格式轉(zhuǎn)換

具體實(shí)現(xiàn)：將nv21格式的1920x1080圖轉(zhuǎn)換成rgb888格式并放縮為640x360大小。具體用到兩個(gè)功能，格式轉(zhuǎn)換和放縮。

首先根據(jù)1920x1080nv21格式以及640x360rgb888格式申請(qǐng)?zhí)摂M地址空間以及轉(zhuǎn)換成物理地址（注意：g2d轉(zhuǎn)換是在物理地址中完成的）

1920x1080nv21格式空間大?。ㄝ斎胛募?/p>

Y占19202380=2073600字節(jié)

UV占19202380/2=1036800字節(jié)

640x360rgb888格式空間大小（輸出文件）：

RGB占6403603=691200字節(jié)

另外：虛擬地址轉(zhuǎn)換成物理地址使用如下函數(shù)：

g2d_getPhyAddrByVirAddr（）

申請(qǐng)?zhí)摂M空間并轉(zhuǎn)換成物理空間完整函數(shù)如下：

staticintPrepareFrmBuff(SAMPLE_G2D_CTX*p_g2d_ctx){SampleG2（dC）onfig*pConfig=NULL;unsignedintsize=0;pConfig=p_g2d_ctx->src_frm_info.frm_width=pConfig->mSrcWidth;p_g2d_ctx->src_frm_info.frm_height=pConfig->mSrcHeight;p_g2d_ctx->dst_frm_info.frm_width=pConfig->mDstWidth;p_g2d_ctx->dst_frm_info.frm_height=pConfig->mDstHeight;size=ALIGN(p_g2d_ctx->src_frm_info.frm_width,16)*ALIGN(p_g2d_ctx->src_frm_info.frm_height,16);if(pConfig->mPicFormat==MM_（PI）XEL_FORMAT_YVU_SEMIPLANAR_420||pConfig->mPicFormat==MM_PIXEL_FORMAT_YUV_SEMIPLANAR_420){p_g2d_ctx->src_frm_info.p_vir_addr[0]=(void*)g2d_allocMem(size);if(NULL==p_g2d_ctx->src_frm_info.p_vir_addr[0]){aloge("malloc_src_frm_y_mem_failed");return-1;}p_g2d_ctx->src_frm_info.p_vir_addr[1]=(void*)g2d_allocMem(size/2);if(NULL==p_g2d_ctx->src_frm_info.p_vir_addr[1]){g2d_freeMem(p_g2d_ctx->src_frm_info.p_vir_addr[0]);aloge("malloc_src_frm_c_mem_failed");return-1;}p_g2d_ctx->src_frm_info.p_phy_addr[0]=(void*)g2d_getPhyAddrByVirAddr(p_g2d_ctx->src_frm_info.p_vir_addr[0]);p_g2d_ctx->src_frm_info.p_phy_addr[1]=(void*)g2d_getPhyAddrByVirAddr(p_g2d_ctx->src_frm_info.p_vir_addr[1]);}if(pConfig->mDstPicFormat==MM_PIXEL_FORMAT_RGB_888){size=p_g2d_ctx->dst_frm_info.frm_width*p_g2d_ctx->dst_frm_info.frm_height*3;p_g2d_ctx->dst_frm_info.p_vir_addr[0]=(void*)g2d_allocMem(size);if(NULL==p_g2d_ctx->dst_frm_info.p_vir_addr[0]){if(p_g2d_ctx->src_frm_info.p_vir_addr[0]!=NULL){g2d_freeMem(p_g2d_ctx->src_frm_info.p_vir_addr[0]);}if(p_g2d_ctx->src_frm_info.p_vir_addr[1]!=NULL){g2d_freeMem(p_g2d_ctx->src_frm_info.p_vir_addr[1]);}aloge("malloc_dst_frm_y_mem_failed");return-1;}p_g2d_ctx->dst_frm_info.p_phy_addr[0]=(void*)g2d_getPhyAddrByVirAddr(p_g2d_ctx->dst_frm_info.p_vir_addr[0]);}return0;}

通過fopen傳菜間兩個(gè)文件句柄，fd_infd_out用來(lái)操作輸入輸出兩個(gè)文件資源。

p_g2d_ctx->fd_in=fopen(p_g2d_ctx->mConfigPara.SrcFile,"r");if(NULL==p_g2d_ctx->fd_in){aloge("opensrcfilefailed");ret=-1;goto_err2;}fseek(p_g2d_ctx->fd_in,0,SEEK_SET);p_g2d_ctx->fd_out=fopen(p_g2d_ctx->mConfigPara.DstFile,"wb");if(NULL==p_g2d_ctx->fd_out){aloge("openoutfilefailed");ret=-1;goto_err2;}fseek(p_g2d_ctx->fd_out,0,SEEK_SET);

讀出1920x1080nv21圖資放入虛擬空間

read_len=p_g2d_ctx->src_frm_info.frm_width*p_g2d_ctx->src_frm_info.frm_height;if(pConfig->mPicFormat==MM_PIXEL_FORMAT_YVU_SEMIPLANAR_420||pConfig->mPicFormat==MM_PIXEL_FORMAT_YUV_SEMIPLANAR_420){size1=fread(p_g2d_ctx->src_frm_info.p_vir_addr[0],1,read_len,p_g2d_ctx->fd_in);if(size1!=read_len){aloge("read_y_data_frm_src_file_invalid");}size2=fread(p_g2d_ctx->src_frm_info.p_vir_addr[1],1,read_len/2,p_g2d_ctx->fd_in);if(size2!=read_len/2){aloge("read_c_data_frm_src_file_invalid");}fclose(p_g2d_ctx->fd_in);g2d_flushCache((void*)p_g2d_ctx->src_frm_info.p_vir_addr[0],read_len);g2d_flushCache((void*)p_g2d_ctx->src_frm_info.p_vir_addr[1],read_len/2);}

打開g2d初始化，并開始轉(zhuǎn)換

ret=SampleG2d_G2dOpen(p_g2d_ctx);if(retmPicFormat,if(ret!=SUCCESS){aloge("fatalerror!srcpixelformat[0x%x]isinvalid!",pConfig->mPicFormat);return-1;}ret=convert_PIXEL_FORMAT_E_to_g2d_fmt_enh(pConfig->mDstPicFormat,if(ret!=SUCCESS){aloge("fatalerror!dstpixelformat[0x%x]isinvalid!",pConfig->mPicFormat);return-1;}//configblit（mems）et(if(0!=pConfig->mDstRotate){aloge("fatal_err:rotation（can）'tbepe（rf）ormedwhendoscaling");}blit.flag_h=G2D_BLT_NONE_H;//anglerotationused//switch(pConfig->mDstRotate)//{//case0://blit.flag_h=G2D_BLT_NONE_H;//G2D_ROT_0,G2D_BLT_NONE_H//break;//case90://blit.flag_h=G2D_ROT_90;//break;//case180://blit.flag_h=G2D_ROT_180;//break;//case270://blit.flag_h=G2D_ROT_270;//break;//default://aloge("fatalerror!rotation[%d]isinvalid!",pConfig->mDstRotate);//blit.flag_h=G2D_BLT_NONE_H;//break;//}//blit.src_image_h.bbuff=1;//blit.src_image_h.color=0xff;blit.src_image_h.format=eSrcFormat;blit.src_image_h.laddr[0]=(unsignedint)p_g2d_ctx->src_frm_info.p_phy_addr[0];blit.src_image_h.laddr[1]=(unsignedint)p_g2d_ctx->src_frm_info.p_phy_addr[1];blit.src_image_h.laddr[2]=(unsignedint)p_g2d_ctx->src_frm_info.p_phy_addr[2];//blit.src_image_h.haddr[]=blit.src_image_h.width=p_g2d_ctx->src_frm_info.frm_width;blit.src_image_h.height=p_g2d_ctx->src_frm_info.frm_height;blit.src_image_h.align[0]=0;blit.src_image_h.align[1]=0;blit.src_image_h.align[2]=0;blit.src_image_h.clip_rect.x=pConfig->mSrcRectX;blit.src_image_h.clip_rect.y=pConfig->mSrcRectY;blit.src_image_h.clip_rect.w=pConfig->mSrcRectW;blit.src_image_h.clip_rect.h=pConfig->mSrcRectH;blit.src_image_h.gamut=G2D_BT601;blit.src_image_h.bpremul=0;//blit.src_image_h.alpha=0xff;blit.src_image_h.mode=G2D_PIXEL_ALPHA;//G2D_PIXEL_ALPHA,G2D_GLOBAL_ALPHAblit.src_image_h.fd=-1;blit.src_image_h.use_phy_addr=1;//blit.dst_image_h.bbuff=1;//blit.dst_image_h.color=0xff;blit.dst_image_h.format=eDstFormat;blit.dst_image_h.laddr[0]=(unsignedint)p_g2d_ctx->dst_frm_info.p_phy_addr[0];blit.dst_image_h.laddr[1]=(unsignedint)p_g2d_ctx->dst_frm_info.p_phy_addr[1];blit.dst_image_h.laddr[2]=(unsignedint)p_g2d_ctx->dst_frm_info.p_phy_addr[2];//blit.dst_image_h.haddr[]=blit.dst_image_h.width=p_g2d_ctx->dst_frm_info.frm_width;blit.dst_image_h.height=p_g2d_ctx->dst_frm_info.frm_height;blit.dst_image_h.align[0]=0;blit.dst_image_h.align[1]=0;blit.dst_image_h.align[2]=0;blit.dst_image_h.clip_rect.x=pConfig->mDstRectX;blit.dst_image_h.clip_rect.y=pConfig->mDstRectY;blit.dst_image_h.clip_rect.w=pConfig->mDstRectW;blit.dst_image_h.clip_rect.h=pConfig->mDstRectH;blit.dst_image_h.gamut=G2D_BT601;blit.dst_image_h.bpremul=0;//blit