🚀 go-pugleaf

Two (possibly) related questions:

(1) I am drawing the image of a page to an offscreen bitmap using PDPageDrawContentsToWindow. I need to allocate a correct height and width for the page in pixels for the resulting bitmap. What I want is an image that represents the size of the page at 100% zoom. This is what I've tried:

ASFixedRect cropBox;
PDPageGetCropBox(AVPageViewGetPage(pageView), &cropBox);
AVDevRect pageRect;
AVPageViewRectToDevice(pageView, &cropBox, &pageRect);
double zoom = ASFixedToFloat(AVPageViewGetZoom(pageView));
int pageWidth = (int) (abs(pageRect.right - pageRect.left) / zoom);
int pageHeight = (int) (abs(pageRect.bottom - pageRect.top) / zoom);

The above width and height are too large for the image drawn to my bitmap by PDPageDrawContentsToWindow.

(2) I notice that when I select File | Export | Image in Acrobat and save the page as a JPEG, the resulting image width and height are substantially larger than the width and height calculated in #1 (which are themselves too large for the PDPageDrawContentsToWindow function). How does Acrobat choose an optimal width/height to avoid aliasing? The size of my output image is arbitrary; I want to choose a width and height that are optimal to capture the image data of the original page, and understand how to scale the output of PDPageDrawContentsToWindow to those values.

Thanks!

Steve