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fpexif: Add AddOrReplaceTagByID and ..ByName methods to TExifData.

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git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@8773 8e941d3f-bd1b-0410-a28a-d453659cc2b4
This commit is contained in:
wp_xxyyzz
2023-03-24 11:08:35 +00:00
parent 8d0a937afc
commit bc05074d55
4 changed files with 46 additions and 6 deletions
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24
components/fpexif/fpeexifdata.pas
View File

@ -95,6 +95,8 @@ type
AData: TBytes; ACount: Integer; ALkupTbl: String = ''): Integer;
function AddOrReplaceTag(ATag: TTag): Integer;
function AddOrReplaceTagByID(ATagID: TTagID): TTag;
function AddOrReplaceTagByName(AFullTagName: String): TTag;
function AddTag(ATag: TTag): Integer;
function AddTagByID(ATagID: TTagID): TTag;
function AddTagByName(AFullTagName: String): TTag;
@ -640,6 +642,28 @@ begin
Result := AddTag(ATag);
end;
function TExifData.AddOrReplaceTagByID(ATagID: TTagID): TTag;
var
idx: Integer;
begin
idx := IndexOfTagID(ATagID);
if idx = -1 then
Result := AddTagByID(ATagID)
else
Result := FTagList[idx];
end;
function TExifData.AddOrReplaceTagByName(AFullTagName: String): TTag;
var
idx: Integer;
begin
idx := IndexOfTagName(AFullTagName);
if idx = -1 then
Result := AddTagByName(AFullTagName)
else
Result := FTagList[idx];
end;
function TExifData.AddTag(ATag: TTag): Integer;
var
parentID: TTagID;

12
components/fpexif/readme.txt
View File

@ -74,19 +74,19 @@ See also "console_demo".
// Read the shutter speed used when taking an image from EXIF data
WriteLn(
'ShutterSpeed: ',
imgInfo.ExifData.TagByName['ShutterSpeed'].AsString
imgInfo.ExifData.TagByName['ShutterSpeed'].AsString
);
// or better (to avoid the exception if this particular tag does not exist):
tag := imgInfo.ExifData.TagByName['ShutterSpeed'];
if tag <> nil then WriteLn('ShutterSpeed: ', tag.AsString);
// or better (to avoid the exception if this particular tag does not exist):
tag := imgInfo.ExifData.TagByName['ShutterSpeed'];
if tag <> nil then WriteLn('ShutterSpeed: ', tag.AsString);
// Add a user comment to the EXIF data
imgInfo.ExifData.TagByName['UserComment'].AsString := 'My best photo';
// Save the modified meta data to file
imgInfo.SaveToFile('MyImage_edited.jpg');
// or: imgInfo.Save; // overwrite currently loaded file
// or: imgInfo.Save; // overwrite currently loaded file
end;
finally

8
components/fpexif/tests/unittest/common/fetexifbe.pas
View File

@ -345,6 +345,10 @@ begin
CheckTrue(lTag <> nil, 'Tag "ExifImageHeight" not found for writing');
lTag.AsInteger := 267;
lTag := imgInfo.ExifData.AddTagByName('EXIF.Artist');
Checktrue(lTag <> nil, 'Tag "EXIF.Artist" not found for writing');
lTag.AsString := 'fpexif-artist';
// Save to file;
// Takes the image data from WorkFile_WithExif, replaces its EXIF with the
// current EXIF structure and writes to WorkFile_NoExif.
@ -422,6 +426,10 @@ begin
CheckTrue(lTag <> nil, 'Tag "ExifImageHeight" not found');
CheckEquals(267, lTag.AsInteger, 'Value mismatch of tag "ExifImageHeight"');
lTag := ImgInfo.ExifData.TagByName['EXIF.Artist'];
CheckTrue(lTag <> nil, 'Tag "EXIF.Artist" not found');
CheckEquals('fpexif-artist', lTag.AsString, 'Value mismatch of tag "EXIF.Artist"');
// No thumbnail in dest file!
finally

8
components/fpexif/tests/unittest/common/fetexifle.pas
View File

@ -496,6 +496,10 @@ begin
CheckTrue(lTag <> nil, 'Tag "ExifImageHeight" not found for writing');
lTag.AsInteger := 150;
lTag := imgInfo.ExifData.AddTagByName('EXIF.Artist');
Checktrue(lTag <> nil, 'Tag "EXIF.Artist" not found for writing');
lTag.AsString := 'fpexif-artist';
// Save to file;
// Takes the image data from WorkFile_WithExif, replaces its EXIF with the
// current EXIF structure and writes to WorkFile_NoExif.
@ -558,6 +562,10 @@ begin
CheckTrue(lTag <> nil, 'Tag "ExifImageHeight" not found for reading');
CheckEquals('150', lTag.AsString, 'Value mismatch of tag "ExifImageHeight"');
lTag := ImgInfo.ExifData.TagByName['EXIF.Artist'];
CheckTrue(lTag <> nil, 'Tag "EXIF.Artist" not found');
CheckEquals('fpexif-artist', lTag.AsString, 'Value mismatch of tag "EXIF.Artist"');
finally
imgInfo.Free;
end;