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Mac OS: explain more accurately in comments how the tricky part of printing an Fl_RGB_Image is handled.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12454 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2017-09-13 06:29:16 +00:00
parent a1ab2eb7b2
commit 8767da2dfd
1 changed files with 13 additions and 10 deletions
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23
src/drivers/Quartz/Fl_Quartz_Graphics_Driver_image.cxx
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@ -165,19 +165,22 @@ void Fl_Quartz_Graphics_Driver::draw(Fl_RGB_Image *img, int XP, int YP, int WP,
if (!ld) ld = img->w() * img->d();
CGDataProviderRef src;
if ( has_feature(PRINTER) ) {
// When printing, the image data is used when the printed page is completed.
// At that stage, the image has possibly been deleted. It is therefore necessary
// to print a copy of the image data. The mask_ member of the Fl_RGB_Image is used to avoid
// repeating the copy operation if the image is printed again.
// The CGImage data provider deletes the copy when the Fl_RGB_Image is deleted.
uchar *copy = new uchar[ld * img->h()];
memcpy(copy, img->array, ld * img->h());
src = CGDataProviderCreateWithData(NULL, copy, ld * img->h(), dataReleaseCB);
// When printing, the data at img->array are used when the printed page is completed,
// that is, after return from this function.
// At that stage, the img object has possibly been deleted. It is therefore necessary
// to use a copy of img->array for printing. The mask_ member of img
// is used to avoid repeating the copy operation if img is printed again.
// The CGImage data provider deletes the copy at the latest of these two events:
// deletion of img, and completion of the page where img was printed.
size_t total = ld * img->h();
uchar *copy = new uchar[total];
memcpy(copy, img->array, total);
src = CGDataProviderCreateWithData(NULL, copy, total, dataReleaseCB);
*Fl_Graphics_Driver::mask(img) = 1;
} else {
// the CGImage data provider need not release the image data.
// the CGImage data provider must not release the image data.
src = CGDataProviderCreateWithData(NULL, img->array, ld * img->h(), NULL);
}
}
cgimg = CGImageCreate(img->w(), img->h(), 8, img->d()*8, ld,
lut, (img->d()&1)?kCGImageAlphaNone:kCGImageAlphaLast,
src, 0L, false, kCGRenderingIntentDefault);