Shulou(Shulou.com)06/02 Report--

Preface

With the exception of the pure_api example, everything else is developed on top of agg::platform_support. These examples hide the details of how to create a render cache buffer and associate agg::rendering_buffer by calling agg::platform_support. In a word, by inheriting from agg::platform_support, you can directly call rbuf_window () to get the rendered cache. And pure_api is the most primitive program, by calling the system API function to build a most complete and detailed example program, and these things have been encapsulated in agg::platform_support. In the wx chapter, there is a detailed description of how to apply AGG for rendering.

Request

The original intention is to get the render cache of the current bitmap, pass it to agg::rendering_bufer, and then start rendering AGG.

Result

After querying a lot of information, you can only create a compatible DC, then create a compatible bitmap, then select a bitmap to get the rendering cache, and then map it to the current compatible DC.

HDC mem_dc =:: CreateCompatibleDC (hdc); / / create compatible DC

Void* buf = 0

HBITMAP bmp =:: CreateDIBSection (/ / create compatible bitmap and get cache

Mem_dc

& bmp_info

DIB_RGB_COLORS

& buf

0

0

);

/ / Selecting the object before doing anything allows you

/ / to use AGG together with native Windows GDI.

HBITMAP temp = (HBITMAP):: SelectObject (mem_dc, bmp)

/ / Map to the current DC, minus 100. you don't want to cover a small area on the right.

:: BitBlt (

Hdc

Rt.left

Rt.top

Width-100

Height

Mem_dc

0

0

SRCCOPY

);

Summary

For a detailed process, please refer to examples in the source directory for complete test cases.

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