RenderPageToString and page size question

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   Hi,

I use the RenderPageToString to get a bitmap from the pdf content.
But default it has a certain size.

I want to create a bitmap in a different size of let's say page 1.
If I use the SetPageDimensions function it crops the bitmap to a part of the page content and does not resize the content (clipped). I tried using the setpagebox, but did not get the right solution out.

Qs:
How can I create a smaller output bitmap than the original size which contains the full page content? 
( I am able to create the original bitmap and afterwards resize this one, but that is more time consuming)

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wjbons Members Profile Find Members Posts Beginner Joined: 17 Jun 10 Status: Offline Points: 17	Post Options Post Reply Quote wjbons Report Post Thanks(0) Quote Reply Topic: RenderPageToString and page size question Posted: 01 Nov 10 at 8:43AM
	Hi, I use the RenderPageToString to get a bitmap from the pdf content. But default it has a certain size. I want to create a bitmap in a different size of let's say page 1. If I use the SetPageDimensions function it crops the bitmap to a part of the page content and does not resize the content (clipped). I tried using the setpagebox, but did not get the right solution out. Qs: How can I create a smaller output bitmap than the original size which contains the full page content? ( I am able to create the original bitmap and afterwards resize this one, but that is more time consuming)

Dimitry Members Profile Find Members Posts Team Player Joined: 18 Feb 10 Status: Offline Points: 37	Post Options Post Reply Quote Dimitry Report Post Thanks(0) Quote Reply Posted: 01 Nov 10 at 7:08PM
	Actually there are two ways to render page to bitmap of certain size: 1. The first way is to define DPI for RenderPageToString(). Unlike output bitmap size, actual page size isn't affected by rendering with various DPI. So PageWidth() and PageHeight() will be same until being changed via SetPageDimensions(). 2. The second way is just to resize output Bitmap using Canvas.CopyRect(). Here is code sample: // Image1: TImage; - destination for resized Bitmap // Bitmap: TBitmap; - our source Bitmap var s, d: TRect; begin s.Left := 0; s.Top := 0; s.Right := Bitmap.Width; s.Bottom := Bitmap.Height; d.Left := 0; d.Top := 0; d.Right := Round(Bitmap.Width/2); // width and height are resized by 50% d.Bottom := Round(Bitmap.Width/2); Image1.Canvas.CopyRect(d, Bitmap.Canvas, s); end; The first way gives definitely highest output quality, but the second is much faster because it uses StretchBlt() API inside.
	Regards, Dmitry

wjbons Members Profile Find Members Posts Beginner Joined: 17 Jun 10 Status: Offline Points: 17	Post Options Post Reply Quote wjbons Report Post Thanks(0) Quote Reply Posted: 02 Nov 10 at 10:30AM
	thanks for your help.