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未验证 提交 5faef144 编写于 作者: O openharmony_ci 提交者： Gitee
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!13015 image文档挑单monthly 

Merge pull request !13015 from renhw/monthly_20221018
上级 6189388f 9a225529
隐藏空白更改
内联 并排
Showing with 83 addition and 91 deletion
zh-cn/application-dev/media/image.md
浏览文件 @ 5faef144
......@@ -19,112 +19,111 @@ const color = new ArrayBuffer(96); // 用于存放图像像素数据
let opts = { alphaType: 0, editable: true, pixelFormat: 4, scaleMode: 1, size: { height: 2, width: 3 } } // 图像像素数据
// 创建pixelmap对象
const color = new ArrayBuffer(96);
let opts = { alphaType: 0, editable: true, pixelFormat: 4, scaleMode: 1, size: { height: 2, width: 3 } }
image.createPixelMap(color, opts, (err, pixelmap) => {
console.log('Succeeded in creating pixelmap.');
})
// 用于读像素
const area = {
pixels: new ArrayBuffer(8),
offset: 0,
stride: 8,
region: { size: { height: 1, width: 2 }, x: 0, y: 0 }
}
pixelmap.readPixels(area,() => {
var bufferArr = new Uint8Array(area.pixels);
var res = true;
for (var i = 0; i < bufferArr.length; i++) {
console.info(' buffer ' + bufferArr[i]);
if(res) {
if(bufferArr[i] == 0) {
res = false;
console.log('readPixels end.');
break;
}
}
}
})
// 用于存像素
const readBuffer = new ArrayBuffer(96);
pixelmap.readPixelsToBuffer(readBuffer,() => {
var bufferArr = new Uint8Array(readBuffer);
var res = true;
for (var i = 0; i < bufferArr.length; i++) {
if(res) {
if (bufferArr[i] !== 0) {
res = false;
console.log('readPixelsToBuffer end.');
break;
}
}
// 用于读像素
const area = {
pixels: new ArrayBuffer(8),
offset: 0,
stride: 8,
region: { size: { height: 1, width: 2 }, x: 0, y: 0 }
}
})
// 用于写像素
pixelmap.writePixels(area,() => {
const readArea = { pixels: new ArrayBuffer(20), offset: 0, stride: 8, region: { size: { height: 1, width: 2 }, x: 0, y: 0 }}
pixelmap.readPixels(readArea,() => {
var readArr = new Uint8Array(readArea.pixels);
pixelmap.readPixels(area,() => {
var bufferArr = new Uint8Array(area.pixels);
var res = true;
for (var i = 0; i < readArr.length; i++) {
for (var i = 0; i < bufferArr.length; i++) {
console.info(' buffer ' + bufferArr[i]);
if(res) {
if (readArr[i] !== 0) {
if(bufferArr[i] == 0) {
res = false;
console.log('readPixels end.please check buffer');
console.log('readPixels end.');
break;
}
}
}
})
})
// 用于写像素到缓冲区
pixelmap.writeBufferToPixels(writeColor).then(() => {
// 用于存像素
const readBuffer = new ArrayBuffer(96);
pixelmap.readPixelsToBuffer(readBuffer).then (() => {
pixelmap.readPixelsToBuffer(readBuffer,() => {
var bufferArr = new Uint8Array(readBuffer);
var res = true;
for (var i = 0; i < bufferArr.length; i++) {
if(res) {
if (bufferArr[i] !== i) {
if (bufferArr[i] !== 0) {
res = false;
console.log('readPixels end.please check buffer');
console.log('readPixelsToBuffer end.');
break;
}
}
}
})
})
// 用于写像素
pixelmap.writePixels(area,() => {
const readArea = { pixels: new ArrayBuffer(20), offset: 0, stride: 8, region: { size: { height: 1, width: 2 }, x: 0, y: 0 }}
pixelmap.readPixels(readArea,() => {
var readArr = new Uint8Array(readArea.pixels);
var res = true;
for (var i = 0; i < readArr.length; i++) {
if(res) {
if (readArr[i] !== 0) {
res = false;
console.log('readPixels end.please check buffer');
break;
}
}
}
})
})
// 用于获取图片信息
pixelmap.getImageInfo((error, imageInfo) => {
if (imageInfo !== null) {
console.log('Succeeded in getting imageInfo');
}
})
const writeColor = new ArrayBuffer(96); //图像像素数据
// 用于写像素到缓冲区
pixelmap.writeBufferToPixels(writeColor).then(() => {
const readBuffer = new ArrayBuffer(96);
pixelmap.readPixelsToBuffer(readBuffer).then (() => {
var bufferArr = new Uint8Array(readBuffer);
var res = true;
for (var i = 0; i < bufferArr.length; i++) {
if(res) {
if (bufferArr[i] !== i) {
res = false;
console.log('readPixels end.please check buffer');
break;
}
}
}
})
})
// 用于获取图片信息
pixelmap.getImageInfo((error, imageInfo) => {
if (imageInfo !== null) {
console.log('Succeeded in getting imageInfo');
}
})
// 用于释放pixelmap
pixelmap.release(()=>{
console.log('Succeeded in releasing pixelmap');
// 用于释放pixelmap
pixelmap.release(()=>{
console.log('Succeeded in releasing pixelmap');
})
})
// 用于创建imagesource(uri)
let path = '/data/local/tmp/test.jpg';
const imageSourceApi = image.createImageSource(path);
const imageSourceApi1 = image.createImageSource(path);
// 用于创建imagesource(fd)
let fd = 29;
const imageSourceApi = image.createImageSource(fd);
const imageSourceApi2 = image.createImageSource(fd);
// 用于创建imagesource(data)
const data = new ArrayBuffer(96);
const imageSourceApi = image.createImageSource(data);
const imageSourceApi3 = image.createImageSource(data);
// 用于释放imagesource
imageSourceApi.release(() => {
imageSourceApi3.release(() => {
console.log('Succeeded in releasing imagesource');
})
......@@ -167,30 +166,22 @@ imageSourceApi.createPixelMap(decodingOptions, (err, pixelmap) => {
// 用于promise创建pixelmap
imageSourceApi.createPixelMap().then(pixelmap => {
console.log('Succeeded in creating pixelmap.');
})
// 函数调用发生异常时，捕捉错误信息
catch(error => {
console.log('Failed in creating pixelmap.' + error);
})
// 用于获取像素每行字节数
var num = pixelmap.getBytesNumberPerRow();
// 用于获取像素总字节数
var pixelSize = pixelmap.getPixelBytesNumber();
// 用于获取像素每行字节数
var num = pixelmap.getBytesNumberPerRow();
// 用于获取pixelmap信息
pixelmap.getImageInfo().then( imageInfo => {});
// 用于获取像素总字节数
var pixelSize = pixelmap.getPixelBytesNumber();
// 用于释放pixelmap
pixelmap.release(()=>{
console.log('Succeeded in releasing pixelmap');
})
// 用于获取pixelmap信息
pixelmap.getImageInfo().then( imageInfo => {});
// 用于捕捉释放失败信息
catch(error => {
console.log('Failed in releasing pixelmap.' + error);
// 用于释放pixelmap
pixelmap.release(()=>{
console.log('Succeeded in releasing pixelmap');
})
}).catch(error => {
console.log('Failed in creating pixelmap.' + error);
})
```
......@@ -216,7 +207,7 @@ if (imagePackerApi == null) {
}
// 如果创建imagepacker成功，则设置编码参数
let packOpts = { format:["image/jpeg"], // 支持编码的格式为jpg
let packOpts = { format:"image/jpeg", // 支持编码的格式为jpg
quality:98 } // 图片质量0-100
// 用于编码
......@@ -233,8 +224,9 @@ imageSourceApi.getImageInfo((err, imageInfo) => {
console.log('Succeeded in getting imageInfo');
})
const array = new ArrayBuffer(100); //增量数据
// 用于更新增量数据
imageSourceIncrementalSApi.updateData(array, false, 0, 10,(error, data)=> {})
imageSourceApi.updateData(array, false, 0, 10,(error, data)=> {})
```
......
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