G2D主要功能:
1)旋轉:支持90、180、270旋轉;
2)scale:放縮;
3)鏡像反轉:H / V;
4)透明疊加:實現兩個rgb圖片疊加;
5)格式轉換:yuv轉rgb等多種格式相互間轉換;
6)矩形填充,等諸多功能;
G2D配置
源碼目錄
tina-v853-docker/kernel/linux-4.9/drivers/char/sunxi_g2d
make kernel_menuconfig 配置
Device Drivers > Character devices > sunxi g2d driver
Device Tree 設備樹配置
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 = <0x0 0x05410000 0x0 0xbffff>; interrupts = ; clocks = <&clk_g2d>; iommus = <&mmu_aw 3 1>; status = "okay"; };
注:status 要設定為“okay” 狀態。
重新編譯內核
使用燒錄工具PhoenixSuit 將編譯打包好的img鏡像燒錄到開發板。
adb shell 打開控制終端查看設備節點G2D:
通過G2D設備節點進行操作
static int SampleG2d_G2dOpen(SAMPLE_G2D_CTX *p_g2d_ctx) { int ret = 0; p_g2d_ctx->mG2dFd = open("/dev/g2d", O_RDWR, 0); if (p_g2d_ctx->mG2dFd < 0) ? ?{ ? ? ? ?aloge("fatal error! open /dev/g2d failed"); ? ? ? ?ret = -1; ? ?} ? ?return ret; }
G2D sample具體應用
G2D sample目錄
進行rotation,scale,格式轉換
具體實現:將 nv21 格式的1920x1080圖轉換成rgb888 格式并放縮為640x360 大小。具體用到兩個功能,格式轉換和放縮。
首先根據1920x1080 nv21 格式以及 640x360 rgb888 格式申請虛擬地址空間以及轉換成物理地址(注意:g2d 轉換是在物理地址中完成的)
1920x1080 nv21 格式空間大?。ㄝ斎胛募?/strong>
Y 占 19201080 = 2073600 字節
UV 占 19201080 / 2 = 1036800 字節
640x360 rgb888 格式空間大?。ㄝ敵鑫募?/strong>
RGB 占 6403603 = 691200 字節
另外:虛擬地址轉換成物理地址使用如下函數:
g2d_getPhyAddrByVirAddr()
申請虛擬空間并轉換成物理空間完整函數如下:
static int PrepareFrmBuff(SAMPLE_G2D_CTX *p_g2d_ctx) { SampleG2dConfig *pConfig = NULL; unsigned int size = 0; pConfig = &p_g2d_ctx->mConfigPara; 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_PIXEL_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]); } return 0; }
通過fopen 傳菜間兩個文件句柄,fd_in fd_out 用來操作輸入輸出兩個文件資源。
p_g2d_ctx->fd_in = fopen(p_g2d_ctx->mConfigPara.SrcFile,"r"); if(NULL == p_g2d_ctx->fd_in) { aloge("open src file failed"); 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("open out file failed"); ret = -1; goto _err2; } fseek(p_g2d_ctx->fd_out, 0, SEEK_SET);
讀出 1920x1080 nv21 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,并開始轉換
ret = SampleG2d_G2dOpen(p_g2d_ctx); if (ret < 0) ? ?{ ? ? ? ?aloge("fatal error! open /dev/g2d fail!"); ? ? ? ?goto _err2; ? ?} ? ?ret = SampleG2d_G2dConvert(p_g2d_ctx); ? ?if (ret < 0) ? ?{ ? ? ? ?aloge("fatal error! g2d convert fail!"); ? ? ? ?goto _close_g2d; ? ?} //具體轉化函數: static int SampleG2d_G2dConvert_scale(SAMPLE_G2D_CTX *p_g2d_ctx) { ? ?int ret = 0; ? ?g2d_blt_h blit; ? ?g2d_fmt_enh eSrcFormat, eDstFormat; ? ?SampleG2dConfig *pConfig = NULL; ? ?pConfig = &p_g2d_ctx->mConfigPara; ret = convert_PIXEL_FORMAT_E_to_g2d_fmt_enh(pConfig->mPicFormat, &eSrcFormat); if(ret!=SUCCESS) { aloge("fatal error! src pixel format[0x%x] is invalid!", pConfig->mPicFormat); return -1; } ret = convert_PIXEL_FORMAT_E_to_g2d_fmt_enh(pConfig->mDstPicFormat, &eDstFormat); if(ret!=SUCCESS) { aloge("fatal error! dst pixel format[0x%x] is invalid!", pConfig->mPicFormat); return -1; } //config blit memset(&blit, 0, sizeof(g2d_blt_h)); if(0 != pConfig->mDstRotate) { aloge("fatal_err: rotation can't be performed when do scaling"); } blit.flag_h = G2D_BLT_NONE_H; // angle rotation used // switch(pConfig->mDstRotate) // { // case 0: // blit.flag_h = G2D_BLT_NONE_H; //G2D_ROT_0, G2D_BLT_NONE_H // break; // case 90: // blit.flag_h = G2D_ROT_90; // break; // case 180: // blit.flag_h = G2D_ROT_180; // break; // case 270: // blit.flag_h = G2D_ROT_270; // break; // default: // aloge("fatal error! rotation[%d] is invalid!", 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] = (unsigned int)p_g2d_ctx->src_frm_info.p_phy_addr[0]; blit.src_image_h.laddr[1] = (unsigned int)p_g2d_ctx->src_frm_info.p_phy_addr[1]; blit.src_image_h.laddr[2] = (unsigned int)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_ALPHA blit.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] = (unsigned int)p_g2d_ctx->dst_frm_info.p_phy_addr[0]; blit.dst_image_h.laddr[1] = (unsigned int)p_g2d_ctx->dst_frm_info.p_phy_addr[1]; blit.dst_image_h.laddr[2] = (unsigned int)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.dst_image_h.alpha = 0xff; blit.dst_image_h.mode = G2D_PIXEL_ALPHA; //G2D_PIXEL_ALPHA, G2D_GLOBAL_ALPHA blit.dst_image_h.fd = -1; blit.dst_image_h.use_phy_addr = 1; ret = ioctl(p_g2d_ctx->mG2dFd, G2D_CMD_BITBLT_H, (unsigned long)&blit); if(ret < 0) ? ?{ ? ? ? ?aloge("fatal error! bit-block(image) transfer failed[%d]", ret); ? ? ? ?system("cd /sys/class/sunxi_dump;echo 0x14A8000,0x14A8100 > dump;cat dump"); } return ret; }
轉化完成后將640x360 rgb888 圖資通過fd_out句柄存儲起來
if(pConfig->mDstPicFormat == MM_PIXEL_FORMAT_RGB_888) { out_len = p_g2d_ctx->dst_frm_info.frm_width * p_g2d_ctx->dst_frm_info.frm_height *3; g2d_flushCache((void *)p_g2d_ctx->dst_frm_info.p_vir_addr[0], out_len); fwrite(p_g2d_ctx->dst_frm_info.p_vir_addr[0], 1, out_len, p_g2d_ctx->fd_out); }
轉化步驟總結
通過步驟3中的模塊化分析,可以看出g2d 轉化大概分為一下步驟:
為打開 iomen 初始化;
為src以及dst圖資申請虛擬地址空間并轉換成物理地址空間;
將src圖資放入虛擬地址空間,然后自動映射到物理地址空間;
打開g2d 設備節點進行轉換(最重要的一環,可以通過手冊分析具體怎么轉換的);
將轉換好的dst圖資保存起來;
審核編輯:劉清
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原文標題:詳解全志V85x內G2D模塊實現圖片格式步驟方法
文章出處:【微信號:gh_79acfa3aa3e3,微信公眾號:全志在線】歡迎添加關注!文章轉載請注明出處。
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