The IlvRGBBitmapData Class
The
IlvRGBBitmapData class is dedicated to true color images, where raster data is a direct representation of the colors of the pixels.
Creating a True Color Bitmap Data of Dimensions 256 * 256 Pixels and Filling it With a Gradient
IlvRGBBitmapData* bdata = new IlvRGBBitmapData(256, 256);
for (IlUInt h = 0; h < 256; ++h)
for (IlUInt w = 0; w < 256; ++w)
bdata->fastSetRGBPixel(w, h, w, h, w);
As with
IlvIndexedBitmapData, you can then create an
IlvBitmap and display it using Rogue Wave Views standard methods.
When on an 8-bit color display, the Rogue Wave® Views library automatically converts this true color image to an indexed image using an algorithm yielding a very high quality image.
The internal representation for true color bitmap data is an array of width * height entries. Each entry is a 4-byte quadruplet describing a pixel as follows:
First byte is the alpha component.
Second byte is the red component.
Third byte is the green component.
Fourth byte is the blue component.
The array can be described top-bottom or bottom-top, so you have a line access method using
getRowStartData.
You can use various methods to access raster data:
getData returns a pointer to the raw raster data.
getRGBPixels allows you to retrieve the RGB representation of a given rectangle.
fill allows you to fill a rectangle with a given color.
copy allows you to copy a rectangle of a bitmap data to a given position in another bitmap data.
blend allows you to smoothly blend a bitmap data into another using a blend factor.
alphaCompose uses the alpha channel to compose two bitmap data.
tile allows you to tile a bitmap data into another.
stretch allows you to stretch a portion of a bitmap data into another.
stretchSmooth allows you to stretch a portion of a bitmap data into another using high quality resampling methods.
You can also independently access the color and alpha values for a given pixel.
Version 5.8
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