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The following image handlers are available. If you initialize the image alpha channel yourself using wxImage::SetAlpha, you should save it in either PNG, TGA, or TIFF format to avoid losing it as these are the only handlers that currently support saving with alpha.
#Wxtoimg poor quality image full
Currently the BMP, PNG, TGA, and TIFF format handlers have full alpha channel support for loading so if you want to use alpha you have to use one of these formats.
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Before using wxImage::GetAlpha you should check if this image contains an alpha channel with wxImage::HasAlpha. While all images have RGB data, not all images have an alpha channel. The constants wxIMAGE_ALPHA_TRANSPARENT and wxIMAGE_ALPHA_OPAQUE can be used to indicate those values in a more readable form. Starting from wxWidgets 2.5.0 wxImage supports alpha channel data, that is in addition to a byte for the red, green and blue colour components for each pixel it also stores a byte representing the pixel opacity.Īn alpha value of 0 corresponds to a transparent pixel (null opacity) while a value of 255 means that the pixel is 100% opaque. One colour value of the image may be used as a mask colour which will lead to the automatic creation of a wxMask object associated to the bitmap object.
#Wxtoimg poor quality image code
By splitting the responsibilities between wxImage/wxBitmap like this then it's easier to use generic code shared by all platforms and image types for generic operations and platform specific code where performance or compatibility is needed. OTOH, wxBitmap is intended to be a wrapper of whatever is the native image format that is quickest/easiest to draw to a DC or to be the target of the drawing operations performed on a wxMemoryDC. It includes generic code for scaling, resizing, clipping, and other manipulations of the image data. It is all generic, platform independent and image file format independent code. More on the difference between wxImage and wxBitmap: wxImage is just a buffer of RGB bytes with an optional buffer for the alpha bytes. This bitmap can then be drawn in a device context, using wxDC::DrawBitmap. Instead, a platform-specific wxBitmap object must be created from it using the wxBitmap::wxBitmap(wxImage,int depth) constructor. Functions are available to set and get image bits, so it can be used for basic image manipulation.Ī wxImage cannot (currently) be drawn directly to a wxDC. An image can be loaded from a file in a variety of formats, and is extensible to new formats via image format handlers. This class encapsulates a platform-independent image.Īn image can be created from data, or using wxBitmap::ConvertToImage.