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Implement MS16052: Use quality '50' when saving PNG Snapshots

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This commit is contained in:
Zach Fox 2018-06-19 10:32:01 -07:00
parent 9ace80c709
commit 3ef41664dc
1 changed files with 11 additions and 5 deletions
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16
interface/src/ui/Snapshot.cpp
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@ -365,15 +365,23 @@ QFile* Snapshot::savedFileForSnapshot(QImage& shot,
// DON'T append ".jpg" to the filename. QT will save the image in the format associated with the // DON'T append ".jpg" to the filename. QT will save the image in the format associated with the
// filename's suffix. // filename's suffix.
// If you want lossless Snapshots, supply a `.png` filename. Otherwise, use `.jpeg` or `.jpg`. // If you want lossless Snapshots, supply a `.png` filename. Otherwise, use `.jpeg` or `.jpg`.
// For PNGs, we use a "quality" of "50". The output image quality is the same as "100"
// is the same as "0" -- the difference lies in the amount of compression applied to the PNG,
// which slightly affects the time it takes to save the image.
// Otherwise, ".jpg" is appended to the user's requested filename so that the image is saved in JPG format. // Otherwise, ".jpg" is appended to the user's requested filename so that the image is saved in JPG format.
// If the user hasn't supplied a specific filename for the snapshot: // If the user hasn't supplied a specific filename for the snapshot:
// Save the snapshot in JPG format according to FILENAME_PATH_FORMAT // Save the snapshot in JPG format at "100" quality according to FILENAME_PATH_FORMAT
int imageQuality = 100;
QString filename; QString filename;
if (!userSelectedFilename.isNull()) { if (!userSelectedFilename.isNull()) {
QFileInfo snapshotFileInfo(userSelectedFilename); QFileInfo snapshotFileInfo(userSelectedFilename);
QString userSelectedFilenameSuffix = snapshotFileInfo.suffix(); QString userSelectedFilenameSuffix = snapshotFileInfo.suffix();
userSelectedFilenameSuffix = userSelectedFilenameSuffix.toLower();
if (SUPPORTED_IMAGE_FORMATS.contains(userSelectedFilenameSuffix)) { if (SUPPORTED_IMAGE_FORMATS.contains(userSelectedFilenameSuffix)) {
filename = userSelectedFilename; filename = userSelectedFilename;
if (userSelectedFilenameSuffix == "png") {
imageQuality = 50;
}
} else { } else {
filename = userSelectedFilename + ".jpg"; filename = userSelectedFilename + ".jpg";
} }
@ -381,8 +389,6 @@ QFile* Snapshot::savedFileForSnapshot(QImage& shot,
filename = FILENAME_PATH_FORMAT.arg(username, now.toString(DATETIME_FORMAT)); filename = FILENAME_PATH_FORMAT.arg(username, now.toString(DATETIME_FORMAT));
} }
const int IMAGE_QUALITY = 100;
if (!isTemporary) { if (!isTemporary) {
// If user has requested specific path then use it, else use the application value // If user has requested specific path then use it, else use the application value
QString snapshotFullPath; QString snapshotFullPath;
@ -432,7 +438,7 @@ QFile* Snapshot::savedFileForSnapshot(QImage& shot,
imageFile = new QFile(snapshotFullPath); imageFile = new QFile(snapshotFullPath);
} }
shot.save(imageFile, 0, IMAGE_QUALITY); shot.save(imageFile, 0, imageQuality);
imageFile->close(); imageFile->close();
return imageFile; return imageFile;
@ -447,7 +453,7 @@ QFile* Snapshot::savedFileForSnapshot(QImage& shot,
} }
imageTempFile->setAutoRemove(isTemporary); imageTempFile->setAutoRemove(isTemporary);
shot.save(imageTempFile, 0, IMAGE_QUALITY); shot.save(imageTempFile, 0, imageQuality);
imageTempFile->close(); imageTempFile->close();
return imageTempFile; return imageTempFile;