博客停更很久了，提起笔来渐感生疏啊！看来，还是得抽出时间来更新更新啊！好了，感慨也发完了，是时候切入正题了。本篇博客主要以本人在实际项目的开发中，为了定位OpenHarmony显示异常究竟是GPU渲染,合成的问题，还是DC端送显异常的问题而来。这里为了后续的复盘，也为可能有共同需求的朋友所以记录下来，最终发展成为如何dump OpenHarmony渲染和合成图层SurfaceBuffer为png图片。(主要是教大家如何把锅甩给队友)！通过本篇博客，读者将会至少学会如下两点:
这里需要注意一点的是，这里的合成指的是GPU(Client)的合成方式！
好了不多说了，直接开干！
能搜寻到这篇博客的，肯定是对OpenHarmony SurfaceBuffer有一定掌握的朋友，所以这里就不会过多解释一些名词和代码逻辑了。总之这是一篇专业性比较强的文章(因为一般的朋友也不会搜这个)！
注意:本篇的介绍是基于OpenHarmony 3.2 release平台为基础的，其中涉及的代码路径如下：
foundation/graphic/graphic_2d/rosen/modules/render_service/core/pipeline/rs_render_service_visitor.cpp
foundation/graphic/graphic_2d/rosen/modules/composer/hdi_backend/src/hdi_backend.cpp
由于此篇博客是实战类型的，所以也就不必对小伙伴们吆喝什么的了，这里没有九块九包邮，也没有九块九上车。有的只有是兄弟就砍一刀。
我们知道OpenHarmony中各个渲染图层是以RSSurfaceRenderNode存在的，所以我们只需要将RSSurfaceRenderNode对应的SurfaceBuffer保存成png图片即可。这里我们直接上我封装好的逻辑代码:
//头文件
#ifndef HDI_BACKEND_UTIL_H
#define HDI_BACKEND_UTIL_H
#include <vector>
#include <iostream>
#include <string>
#include "surface_buffer.h"
#include <unordered_map>
#include <refbase.h>
#include <parameter.h>
#include <parameters.h>
#include "pipeline/rs_surface_render_node.h"
namespace OHOS {
namespace Rosen {
using WriteToPngParam = struct {
uint32_t width;
uint32_t height;
uint32_t stride;
uint32_t bitDepth;
const uint8_t *data;
};
class RSBaseRenderUtil {
public:
static const int ALLSURFACES = 2;
static bool WriteHdiOutToPng(const sptr<SurfaceBuffer> &buffer, const BufferHandle *bufferHandle);
static bool WriteSurfaceBufferToPng(const sptr<SurfaceBuffer> &buffer);
static bool WriteSurfaceRenderNodeToPng(const RSSurfaceRenderNode& node);
private:
static bool WriteToPng(const std::string &filename, const WriteToPngParam ¶m);
};
} // namespace Rosen
} // namespace OHOS
#endif // HDI_BACKEND_UTIL_H
//具体实现
#include "hdi_backend_util.h"
#include "png.h"
#include "hdi_log.h"
#include <sys/time.h>
namespace OHOS {
namespace Rosen {
bool RSBaseRenderUtil::WriteToPng(const std::string &filename, const WriteToPngParam ¶m)
{
HLOGI("RSBaseRenderUtil::WriteToPng filename = %s{public}", filename.c_str());
png_structp pngStruct = png_create_write_struct(PNG_LIBPNG_VER_STRING, nullptr, nullptr, nullptr);
if (pngStruct == nullptr) {
return false;
}
png_infop pngInfo = png_create_info_struct(pngStruct);
if (pngInfo == nullptr) {
png_destroy_write_struct(&pngStruct, nullptr);
return false;
}
FILE *fp = fopen(filename.c_str(), "wb");
if (fp == nullptr) {
png_destroy_write_struct(&pngStruct, &pngInfo);
return false;
}
png_init_io(pngStruct, fp);
// set png header
png_set_IHDR(pngStruct, pngInfo,
param.width, param.height,
param.bitDepth,
PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE,
PNG_COMPRESSION_TYPE_BASE,
PNG_FILTER_TYPE_BASE);
png_set_packing(pngStruct); // set packing info
png_write_info(pngStruct, pngInfo); // write to header
for (uint32_t i = 0; i < param.height; i++) {
png_write_row(pngStruct, param.data + (i * param.stride));
}
png_write_end(pngStruct, pngInfo);
// free
png_destroy_write_struct(&pngStruct, &pngInfo);
int ret = fclose(fp);
return ret == 0;
}
bool RSBaseRenderUtil::WriteHdiOutToPng(const sptr<SurfaceBuffer> &buffer, const BufferHandle *bufferHandle)
{
if((std::atoi((system::GetParameter("rosen.dump.surfacebuffer", "0")).c_str()) == ALLSURFACES) )
{
HLOGE("allow WriteHdiOutToPng");
{
if (bufferHandle == nullptr) {
return false;
}
struct timeval now;
gettimeofday(&now, nullptr);
constexpr int secToUsec = 1000 * 1000;
int64_t nowVal = static_cast<int64_t>(now.tv_sec) * secToUsec + static_cast<int64_t>(now.tv_usec);
std::string filename = "/data/hdioutput/hdi_output_layer_" +
std::to_string(nowVal) + ".png";
WriteToPngParam param;
param.width = static_cast<uint32_t>(bufferHandle->width);
param.height = static_cast<uint32_t>(bufferHandle->height);
param.data = (uint8_t*)(buffer->GetVirAddr());
param.stride = static_cast<uint32_t>(bufferHandle->stride);
param.bitDepth = 8;
WriteToPng(filename, param);
}
}
return false;
}
bool RSBaseRenderUtil::WriteSurfaceBufferToPng(const sptr<SurfaceBuffer> &buffer)
{
if((std::atoi((system::GetParameter("rosen.dump.surfacebuffer", "0")).c_str()) == ALLSURFACES) )
{
HLOGE("allow WriteHdiOutToPng");
{
BufferHandle *bufferHandle = buffer->GetBufferHandle();
if (bufferHandle == nullptr) {
return false;
}
struct timeval now;
gettimeofday(&now, nullptr);
constexpr int secToUsec = 1000 * 1000;
int64_t nowVal = static_cast<int64_t>(now.tv_sec) * secToUsec + static_cast<int64_t>(now.tv_usec);
std::string filename = "/data/hdioutput/hdi_output_layer_" +
std::to_string(nowVal) + ".png";
WriteToPngParam param;
param.width = static_cast<uint32_t>(bufferHandle->width);
param.height = static_cast<uint32_t>(bufferHandle->height);
param.data = (uint8_t*)(buffer->GetVirAddr());
param.stride = static_cast<uint32_t>(bufferHandle->stride);
param.bitDepth = 8;
WriteToPng(filename, param);
}
}
return false;
}
bool RSBaseRenderUtil::WriteSurfaceRenderNodeToPng(const RSSurfaceRenderNode& node)
{
if((std::atoi((system::GetParameter("rosen.dump.rendernode", "0")).c_str()) == ALLSURFACES))
{
sptr<SurfaceBuffer> buffer = node.GetBuffer();
if (buffer == nullptr) {
return false;
}
BufferHandle *bufferHandle = buffer->GetBufferHandle();
if (bufferHandle == nullptr) {
return false;
}
struct timeval now;
gettimeofday(&now, nullptr);
constexpr int secToUsec = 1000 * 1000;
int64_t nowVal = static_cast<int64_t>(now.tv_sec) * secToUsec + static_cast<int64_t>(now.tv_usec);
std::string filename = "/data/SurfaceRenderNode_" +
node.GetName() + "_" +
std::to_string(node.GetId()) + "_" +
std::to_string(nowVal) + ".png";
WriteToPngParam param;
param.width = static_cast<uint32_t>(bufferHandle->width);
param.height = static_cast<uint32_t>(bufferHandle->height);
param.data = (uint8_t*)(buffer->GetVirAddr());
param.stride = static_cast<uint32_t>(bufferHandle->stride);
param.bitDepth = 8;
return WriteToPng(filename, param);
}
return false;
}
}// namespace Rosen
} // namespace OHOS
接下来我们要做的就是在OpenHarmony的处理逻辑中，调用什么的源码进行dump，具体操作步骤如下:
在rs_render_service_visitor.cpp中引入上述头文件，并且在下面引入dump
//foundation/graphic/graphic_2d/rosen/modules/render_service/core/pipeline/rs_render_service_visitor.cpp
void RSRenderServiceVisitor::ProcessSurfaceRenderNode(RSSurfaceRenderNode& node)
{
...
//不一定要在这个地方，只需要是渲染后对对应的RSSurfaceRenderNode操作即可
RSBaseRenderUtil::WriteSurfaceRenderNodeToPng(node);
...
}
当我们想要dump时候，只需要将对应parma打开即可
rosen.dump.rendernode
接着就可以在data目录下看到生成的png图片
这块我们可以在hdi_backend.cpp的如下方法中添加相关的逻辑，如下:
int32_t HdiBackend::SetScreenClientInfo(const FrameBufferEntry &fbEntry, const OutputPtr &output)
{
...
RSBaseRenderUtil::WriteSurfaceBufferToPng(fbEntry.buffer);
...
}
这当然上述仅仅是提供了一种思路，具体的上述源码逻辑用在什么地方，读者可以根据自己的需要自行调整。这里我们简单测试一下，看看生成的dump文件如下:
到这里dump的相关逻辑就告一段落了，细心的朋友也许会发现dump渲染和合成的图层代码逻辑基本完全一致。是的，这是因为无论是渲染的图层还是合成之后的图层它们都是通过SurfaceBuffer来进行存储指向的。
其中，我们引用上述封装好的dump函数时候，我们在对应的BUILD.gn中必须，引入如下的库和头文件，如下
deps = [
"//foundation/graphic/graphic_2d:libsurface",
"//foundation/graphic/graphic_2d/rosen/modules/render_service_base:librender_service_base",
]
public_deps = [
"//foundation/graphic/graphic_2d/utils:buffer_handle",
"//third_party/libpng:libpng",
]
external_deps = [ "init:libbegetutil" ]
include_dirs = [
"//drivers/peripheral/display/interfaces/include",
"//third_party/libpng",
]
这里我们简单总结下dump OpenHarmony中各种图层SurfaceBuffer内容的思路:
这里重点补充一下，关于dump SurfaceBuffer获取的信息大小，格式,以及存储计算规则是否正确可以通过hidumper -s RenderService -a allInfo 进行查看，如下:
# hidumper -s RenderService
-------------------------------[ability]-------------------------------
----------------------------------RenderService---------------------------------
------Graphic2D--RenderSerice ------
Usage:
h |help text for the tool
screen |dump all screen infomation in the system
surface |dump all surface information
composer fps |dump the fps info of composer
[surface name] fps |dump the fps info of surface
composer fpsClear |clear the fps info of composer
[surface name] fpsClear |clear the fps info of surface
nodeNotOnTree |dump nodeNotOnTree info
allSurfacesMem |dump surface mem info
RSTree |dump RSTree info
EventParamList |dump EventParamList info
allInfo |dump all info
# hidumper -s RenderService -a allInfo
-------------------------------[ability]-------------------------------
----------------------------------RenderService---------------------------------
-- ScreenInfo
screen[0]: id=2, powerstatus=POWER_STATUS_ON, backlight=-1, screenType=EXTERNAL_TYPE
supportedMode[0]: 720x400, refreshrate=70
supportedMode[1]: 640x480, refreshrate=60
supportedMode[2]: 640x480, refreshrate=75
supportedMode[3]: 800x600, refreshrate=60
supportedMode[4]: 800x600, refreshrate=75
supportedMode[5]: 1024x768, refreshrate=60
supportedMode[6]: 1152x864, refreshrate=75
supportedMode[7]: 1280x1024, refreshrate=60
supportedMode[8]: 1280x1024, refreshrate=75
supportedMode[9]: 1920x1080, refreshrate=60
activeMode: 1920x1080, refreshrate=60
capability: name=Unknown, phywidth=530, phyheight=300,supportlayers=0, virtualDispCount=0, propCount=0, type=INVILID_DISP_INTF, supportWriteBack=false
-- LayerInfo
surface [ScreenLockWindow] NodeId[2954937499653] LayerId[2]://锁屏界面
zOrder = 0, visibleNum = 1, transformType = 0 <no rotation>, compositionType = 0 <client composistion>, blendType = 3 <SRC_OVER blending>, layerAlpha = [enGlobalAlpha(1), enPixelAlpha(0), alpha0(0), alpha1(0), gAlpha(255)].
layerRect = [0, 0, 1920, 1080], visibleRegion = [0, 0, 1920, 1080], dirtyRegion = [0, 0, 1920, 1080], cropRect = [0, 0, 1920, 1080].
BufferQueue:
default-size = [1920x1080], FIFO = 3, name = ScreenLockWindow, uniqueId = 2954937499653, usedBufferListLen = 3, freeBufferListLen = 2, dirtyBufferListLen = 0, totalBuffersMemSize = 24300.00(KiB).
bufferQueueCache:
sequence = 8, state = 0 <released>, timestamp = 780011576923, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 9, state = 0 <released>, timestamp = 840016378613, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 13, state = 3 <acquired>, timestamp = 900011540119, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
FrameBufferSurface
BufferQueue:
default-size = [0x0], FIFO = 3, name = FrameBuffer, uniqueId = 2954937499648, usedBufferListLen = 2, freeBufferListLen = 1, dirtyBufferListLen = 0, totalBuffersMemSize = 16200.00(KiB).
bufferQueueCache:
sequence = 2, state = 3 <acquired>, timestamp = 900046439, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 73, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 4, state = 0 <released>, timestamp = 840051447, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 73, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
-- Node Not On Tree
node Id[6597069766667]:
BufferQueue:
default-size = [0x0], FIFO = 3, name = SystemUi_BannerNotice, uniqueId = 2954937499659, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
node Id[6597069766666]:
BufferQueue:
default-size = [0x0], FIFO = 3, name = SystemUi_DropdownPanel, uniqueId = 2954937499658, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
node Id[6597069766658]:
BufferQueue:
default-size = [0x0], FIFO = 3, name = SystemUi_VolumePanel, uniqueId = 2954937499654, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
node Id[7146825580544]:
BufferQueue:
default-size = [0x0], FIFO = 3, name = imeWindow, uniqueId = 2954937499652, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
node Id[6962141986820]:
BufferQueue:
default-size = [0x0], FIFO = 3, name = RecentView, uniqueId = 2954937499651, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
-- All Surfaces Memory Size
the memory size of all surfaces buffer is : 94680.00 KiB.
BufferQueue:
default-size = [0x0], FIFO = 3, name = SystemUi_DropdownPanel, uniqueId = 2954937499658, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
BufferQueue:
default-size = [1920x32], FIFO = 3, name = SystemUi_PrivacyIndicator, uniqueId = 2954937499657, usedBufferListLen = 3, freeBufferListLen = 1, dirtyBufferListLen = 0, totalBuffersMemSize = 720.00(KiB).
bufferQueueCache:
sequence = 12, state = 1 <requested>, timestamp = 40645170158, damageRect = [0, 0, 1920, 32], config = [1920x32, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 32, bufferMemSize = 240.00(KiB).
sequence = 14, state = 3 <acquired>, timestamp = 40912469187, damageRect = [0, 0, 1920, 32], config = [1920x32, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 32, bufferMemSize = 240.00(KiB).
sequence = 17, state = 0 <released>, timestamp = 40827680126, damageRect = [0, 0, 1920, 32], config = [1920x32, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 32, bufferMemSize = 240.00(KiB).
BufferQueue:
default-size = [1920x1080], FIFO = 3, name = EntryView, uniqueId = 2954937499650, usedBufferListLen = 3, freeBufferListLen = 2, dirtyBufferListLen = 0, totalBuffersMemSize = 24300.00(KiB).
bufferQueueCache:
sequence = 5, state = 0 <released>, timestamp = 31794906265, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 6, state = 0 <released>, timestamp = 32561536655, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 7, state = 3 <acquired>, timestamp = 32644867137, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
BufferQueue:
default-size = [1920x108], FIFO = 3, name = SystemUi_NavigationBar, uniqueId = 2954937499656, usedBufferListLen = 3, freeBufferListLen = 2, dirtyBufferListLen = 0, totalBuffersMemSize = 2430.00(KiB).
bufferQueueCache:
sequence = 11, state = 0 <released>, timestamp = 40827680126, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
sequence = 16, state = 0 <released>, timestamp = 40912469187, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
sequence = 19, state = 3 <acquired>, timestamp = 60012066524, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
BufferQueue:
default-size = [0x0], FIFO = 3, name = SystemUi_VolumePanel, uniqueId = 2954937499654, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
BufferQueue:
default-size = [1920x1080], FIFO = 3, name = ScreenLockWindow, uniqueId = 2954937499653, usedBufferListLen = 3, freeBufferListLen = 2, dirtyBufferListLen = 0, totalBuffersMemSize = 24300.00(KiB).
bufferQueueCache:
sequence = 8, state = 0 <released>, timestamp = 780011576923, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 9, state = 0 <released>, timestamp = 840016378613, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
sequence = 13, state = 3 <acquired>, timestamp = 900011540119, damageRect = [0, 0, 1920, 1080], config = [1920x1080, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 1080, bufferMemSize = 8100.00(KiB).
BufferQueue:
default-size = [0x0], FIFO = 3, name = imeWindow, uniqueId = 2954937499652, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
BufferQueue:
default-size = [0x0], FIFO = 3, name = RecentView, uniqueId = 2954937499651, usedBufferListLen = 0, freeBufferListLen = 0, dirtyBufferListLen = 0, totalBuffersMemSize = 0.00(KiB).
bufferQueueCache:
BufferQueue:
default-size = [1920x108], FIFO = 3, name = SystemUi_StatusBar, uniqueId = 2954937499655, usedBufferListLen = 3, freeBufferListLen = 2, dirtyBufferListLen = 0, totalBuffersMemSize = 2430.00(KiB).
bufferQueueCache:
sequence = 10, state = 0 <released>, timestamp = 40827680126, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
sequence = 15, state = 3 <acquired>, timestamp = 60012066524, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
sequence = 18, state = 0 <released>, timestamp = 40912469187, damageRect = [0, 0, 1920, 108], config = [1920x108, 8, 12, 9, 3000], bufferWith = 1920, bufferHeight = 108, bufferMemSize = 810.00(KiB).
-- RenderServiceTreeDump:
Animating Node: [];
| BASE_NODE[0], isOnTheTree: 1, children[2963527434241 ]
| DISPLAY_NODE[2963527434241], isOnTheTree: 1, children[6597069766656 6597069766661 6597069766664 6597069766665 6962141986816 ]
| SURFACE_NODE[6597069766656], isOnTheTree: 1, hasConsumer: 1, Name [ScreenLockWindow], parent [2963527434241], { Region Size 1: [0, 0, 1920, 1080] }, SurfaceBgAlpha[ 255 ], children[]
| SURFACE_NODE[6597069766661], isOnTheTree: 1, hasConsumer: 1, Name [SystemUi_StatusBar], parent [2963527434241], { Region Size 0: }, SurfaceBgAlpha[ 0 ], children[]
| SURFACE_NODE[6597069766664], isOnTheTree: 1, hasConsumer: 1, Name [SystemUi_NavigationBar], parent [2963527434241], { Region Size 0: }, SurfaceBgAlpha[ 0 ], children[]
| SURFACE_NODE[6597069766665], isOnTheTree: 1, hasConsumer: 1, Name [SystemUi_PrivacyIndicator], parent [2963527434241], { Region Size 0: }, SurfaceBgAlpha[ 0 ], children[]
| SURFACE_NODE[6962141986816], isOnTheTree: 1, hasConsumer: 1, Name [EntryView], parent [2963527434241], { Region Size 0: }, SurfaceBgAlpha[ 0 ], children[]
-- EventParamListDump:
rosen.RsDFXEvent.RS_COMPOSITION_TIMEOUT.timeOutThresholdMs: 100
rosen.RsDFXEvent.RS_COMPOSITION_TIMEOUT.eventIntervalMs: 60000
-- QosDump:
QOS is disabled
至此OpenHarmony dump渲染和合成图层SurfaceBuffer指南整个就完成了，读者是感到意犹未尽呢，还是想说一句尼玛，瞎扯淡呢！
好了，OpenHarmony dump渲染和合成图层SurfaceBuffer指南就告一段落了，各位青山不改绿水长流，各位江湖见！当然各位读者的点赞和关注是我写作路上前进的最大动力了，如果有啥不对或者不爽的也可以踩一踩也无妨！你们的鼓励和批评是博主前进路上最大的动力。
各位读友，千万不要喷我，因为我这也是第一次深入到OpenHarmony显示这块的源码逻辑，为啥我深入到了这块，因为入职了一家原厂。所以我现在是菜鸟一杯，如果有对OpenHarmony graphic刚兴趣的朋友，也可以联系我，一起学习进步！