I am evaluating how difficult it would be to use an external library for drawing images in LabWindows. The library comes with binaries
only that were generated in MS Visual Studio, so I assume they can be linked loaded into LabWindows.
Are there likely to be linking issues if the external libraries referenence some Microsoft library not included in LabWindows.
Or does LabWindows have the full complement of Microsoft libraries so anything in Visual Studio will link?
There is an API for drawing a image to memory and also drawing an image to a Hardware Device Context.
The question is should I be able to use these functions when linked and called from a labwindows gui app to
first draw the pixmap nd then copy the pixmap to a LabWindows Canvas?
Canvases don't support alpha channels but the library drawing routing uses an alpha channel.
I am newbie to LabWindows.
Here is the Labwindows function that looks like what I should use
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CanvasDrawBitmap
int CanvasDrawBitmap (int panelHandle, int controlID, int bitmapID, Rect sourceRectangle, Rect destinationRectangle);
Here are the external API functions
-------------
// List of supported color formats for GM_DrawLayerListToMemory
typedef uint32 GM_ColorFormat_t32; enum
{
GM_ColorFormat_32Bit_ABGR = 0, // 32-bit color (alpha, blue, green, red)
GM_ColorFormat_32Bit_ARGB = 1, // 32-bit color (alpha, red, green, blue)
GM_ColorFormat_16Bit_565 = 2, // 16-bit color (5 bits red, 6 bits green, 5 bits blue)
GM_ColorFormat_NumFormats
};
Draws one or more layers to the provided device context at the given location. If aWorldBounds is not NULL, at least the specified area will be drawn. The aspect ratio of the screen pixels will be maintained, so slightly more of the world bounds than specified may be drawn. If aWorldBounds is NULL, the entire specified layer or all of the loaded layers will be rendered.
GM_DrawLayerListToMemory
GM_Error_t32 GM_DrawLayerListToMemory
(
GM_LayerHandle_t32* aLayerList, // List of layers to draw or NULL for all
uint32 aLayerCount, // Number of layers in list (0 for all)
GM_DrawFlags_t32 aDrawFlags, // Flags controlling how the draw is performed
const GM_Rectangle_t* aWorldBounds, // World bounds to draw or NULL for all
GM_ColorFormat_t32 aColorFormat, // Color format used in data buffer
sint32 aPixelWidth, // Width in pixels to draw
sint32 aPixelHeight, // Height in pixels to draw
void* aDataBuf, // Buffer to hold output color data
sint32 aRowWidthBytes // Width of a single row in the array in bytes
);
Draws one or more layers to the provided memory buffer at the given location. If aWorldBounds is not NULL, at least the specified area will be drawn. The aspect ratio of the screen pixels will be maintained, so slightly more of the world bounds than specified may be drawn. If aWorldBounds is NULL, the entire specified layer or all of the loaded layers will be rendered.
GM_DrawLayerList
GM_Error_t32 GM_DrawLayerList
(
HDC aDC, // Device context to draw to
GM_LayerHandle_t32* aLayerList, // List of layers to draw or NULL for all
uint32 aLayerCount, // Number of layers in list (0 for all)
GM_DrawFlags_t32 aDrawFlags, // Flags controlling how the draw is performed
const GM_Rectangle_t* aWorldBounds, // World bounds to draw or NULL for all
sint32 aLeftPixel, // Left pixel coordinate to draw to
sint32 aTopPixel, // Top pixel coordinate to draw to
sint32 aPixelWidth, // Width in pixels to draw
sint32 aPixelHeight // Height in pixels to draw
);
