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screenshot.go
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/
screenshot.go
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package chrome
import (
"bytes"
"context"
"encoding/base64"
"io/ioutil"
"github.com/unixpickle/essentials"
)
// ScreenshotPNG captures a screenshot of the page and
// returns the raw PNG image data.
func (c *Conn) ScreenshotPNG(ctx context.Context) (imageData []byte, err error) {
defer essentials.AddCtxTo("capture PNG screenshot", &err)
return c.captureScreenshot(ctx, nil)
}
// ScreenshotJPEG captures a compressed screenshot of the
// page and returns the raw JPEG image data.
//
// The quality is an integer in the range [0, 100].
func (c *Conn) ScreenshotJPEG(ctx context.Context, quality int) (imageData []byte,
err error) {
defer essentials.AddCtxTo("capture JPEG screenshot", &err)
return c.captureScreenshot(ctx, map[string]interface{}{
"format": "jpeg",
"quality": quality,
})
}
func (c *Conn) captureScreenshot(ctx context.Context, params interface{}) ([]byte,
error) {
var resObj struct {
Data string `json:"data"`
}
if err := c.call(ctx, "Page.captureScreenshot", params, &resObj); err != nil {
return nil, err
}
dataReader := bytes.NewReader([]byte(resObj.Data))
decoder := base64.NewDecoder(base64.StdEncoding, dataReader)
return ioutil.ReadAll(decoder)
}