使用Image_NativeModule完成位图操作

创建位图，获取位图的宽、高、pixelFormat、alphaType、rowStride信息、对位图进行操作以及释放位图实例。

开发步骤

添加链接库

在进行应用开发之前，开发者需要打开native工程的src/main/cpp/CMakeLists.txt，在target_link_libraries依赖中添加libpixelmap.so以及日志依赖libhilog_ndk.z.so。

target_link_libraries(entry PUBLIC libhilog_ndk.z.so libpixelmap.so)

Native接口调用

具体接口说明请参考API文档。

在hello.cpp中实现C API接口调用逻辑，示例代码如下：

位图接口使用示例

在初始化参数后创建Pixelmap实例，进行图片像素数据的读写，对图片进行缩放、位置变换、反转、旋转、裁剪等操作。

   #include <linux/kd.h>
   #include <string>

   #include <hilog/log.h>
   #include <multimedia/image_framework/image/pixelmap_native.h>

   #undef LOG_DOMAIN
   #undef LOG_TAG
   #define LOG_DOMAIN 0x3200
   #define LOG_TAG "MY_TAG"

   Image_ErrorCode PixelmapTest()
   {
       uint8_t data[96];
       size_t dataSize = 96;
       for (int i = 0; i < dataSize; i++) {
           data[i] = i + 1;
       }

       //创建参数结构体实例，并设置参数。
       OH_Pixelmap_InitializationOptions *createOpts;
       OH_PixelmapInitializationOptions_Create(&createOpts);
       OH_PixelmapInitializationOptions_SetWidth(createOpts, 6);
       OH_PixelmapInitializationOptions_SetHeight(createOpts, 4);
       OH_PixelmapInitializationOptions_SetPixelFormat(createOpts, PIXEL_FORMAT_RGBA_8888);
       OH_PixelmapInitializationOptions_SetAlphaType(createOpts, PIXELMAP_ALPHA_TYPE_UNKNOWN);

       //创建Pixelmap实例。
       OH_PixelmapNative *pixelmap = nullptr;
       Image_ErrorCode errCode = OH_PixelmapNative_CreatePixelmap(data, dataSize, createOpts, &pixelmap);

       //读取图像像素数据，结果写入数组里。
       uint8_t destination[96];
       size_t destinationSize = 96;
       errCode = OH_PixelmapNative_ReadPixels(pixelmap, destination, &destinationSize);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_ReadPixels failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //读取缓冲区中的图片数据，结果写入Pixelmap中。
       uint8_t source[96];
       size_t sourceSize = 96;
       for (int i = 0; i < sourceSize; i++) {
           source[i] = i + 1;
       }
       errCode = OH_PixelmapNative_WritePixels(pixelmap, source, sourceSize);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_WritePixels failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //创建图片信息实例，并获取图像像素信息。
       OH_Pixelmap_ImageInfo *imageInfo;
       OH_PixelmapImageInfo_Create(&imageInfo);
       errCode = OH_PixelmapNative_GetImageInfo(pixelmap, imageInfo);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_GetImageInfo failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //获取图片的宽，高，pixel格式，透明度等信息。
       uint32_t width, height, rowStride;
       int32_t pixelFormat, alphaType;
       OH_PixelmapImageInfo_GetWidth(imageInfo, &width);
       OH_PixelmapImageInfo_GetHeight(imageInfo, &height);
       OH_PixelmapImageInfo_GetRowStride(imageInfo, &rowStride);
       OH_PixelmapImageInfo_GetPixelFormat(imageInfo, &pixelFormat);
       OH_PixelmapImageInfo_GetAlphaType(imageInfo, &alphaType);
       OH_PixelmapImageInfo_Release(imageInfo);
       OH_LOG_INFO(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest GetImageInfo success, width: %{public}d, height: %{public}d, rowStride: %{public}d, pixelFormat: %{public}d, alphaType: %{public}d.", width, height, rowStride, pixelFormat, alphaType);

       //设置透明比率来让Pixelap达到对应的透明效果。
       errCode = OH_PixelmapNative_Opacity(pixelmap, 0.5);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Opacity failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //对图片进行缩放。
       errCode = OH_PixelmapNative_Scale(pixelmap, 2.0, 1.0);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Scale failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //对图片进行位置变换。
       errCode = OH_PixelmapNative_Translate(pixelmap, 50.0, 10.0);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Translate failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //对图片进行旋转。
       errCode = OH_PixelmapNative_Rotate(pixelmap, 90.0);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Rotate failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //对图片进行翻转。
       errCode = OH_PixelmapNative_Flip(pixelmap, true, true);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Flip failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //对图片进行裁剪。
       Image_Region region;
       region.x = 100;
       region.y = 100;
       region.width = 6;
       region.height = 4;
       errCode = OH_PixelmapNative_Crop(pixelmap, &region);
       if (errCode != IMAGE_SUCCESS) {
           OH_LOG_ERROR(LOG_APP, "ImagePixelmapNativeCTest pixelmapTest OH_PixelmapNative_Crop failed, errCode: %{public}d.", errCode);
           return errCode;
       }

       //释放Pixelmap, InitializationOptions实例。
       OH_PixelmapNative_Release(pixelmap);
       OH_PixelmapInitializationOptions_Release(createOpts);
       return IMAGE_SUCCESS;
   }