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ImageAttributes.SetRemapTable method

Applies to: desktop apps only

The ImageAttributes::SetRemapTable method sets the color-remap table for a specified category.

Syntax

Status SetRemapTable(
  [in]            UINT mapSize,
  [in]            const ColorMap *map,
  [in, optional]  ColorAdjustType type
);

Parameters

mapSize [in]

Type: UINT

INT that specifies the number of elements in the map array.

map [in]

Type: const ColorMap*

Pointer to an array of ColorMap structures that defines the color map.

type [in, optional]

Type: ColorAdjustType

Element of the ColorAdjustType enumeration that specifies the category for which the color-remap table is set. The default value is ColorAdjustTypeDefault.

Return value

Type:

Type: Status

If the method succeeds, it returns Ok, which is an element of the Status enumeration.

If the method fails, it returns one of the other elements of the Status enumeration.

Remarks

A color-remap table is an array of ColorMap structures. Each ColorMap structure has two Color objects: one that specifies an old color and one that specifies a corresponding new color. During rendering, any color that matches one of the old colors in the remap table is changed to the corresponding new color.

An ImageAttributes object maintains color and grayscale settings for five adjustment categories: default, bitmap, brush, pen, and text. For example, you can specify a color remap for the default category, a color-remap table for the bitmap category, and still a different color-remap table for the pen category.

The default color- and grayscale-adjustment settings apply to all categories that don't have adjustment settings of their own. For example, if you never specify any adjustment settings for the pen category, then the default settings apply to the pen category.

As soon as you specify a color- or grayscale-adjustment setting for a certain category, the default adjustment settings no longer apply to that category. For example, suppose you specify a collection of adjustment settings for the default category. If you set the color-remap table for the pen category by passing ColorAdjustTypePen to the ImageAttributes::SetRemapTable method, then none of the default adjustment settings will apply to pens.

Examples

The following example creates an Image object based on a .bmp file and then draws the image. The code creates an ImageAttributes object and sets its default remap table so that red is converted to blue. Then the code draws the image again using the color adjustment specified by the remap table.



VOID Example_SetRemapTable(HDC hdc)
{
   Graphics graphics(hdc);

   // Create an Image object based on a .bmp file.
   // The image has one red stripe and one green stripe.
   Image image(L"RedGreenStripes.bmp");

   // Create an ImageAttributes object and set its remap table.
   ImageAttributes imageAtt;
   ColorMap cMap;
   cMap.oldColor = Color(255, 255, 0, 0);  // red 
   cMap.newColor = Color(255, 0, 0, 255);  // blue
   imageAtt.SetRemapTable(12, &cMap,
      ColorAdjustTypeDefault);

   // Draw the image with no color adjustment.
   graphics.DrawImage(&image, 10, 10, image.GetWidth(), image.GetHeight());
 
   // Draw the image with red converted to blue.
   graphics.DrawImage(&image,
      Rect(100, 10, image.GetWidth(), image.GetHeight()),  // dest rect
      0, 0, image.GetWidth(), image.GetHeight(),           // source rect
      UnitPixel,
      &imageAtt);
}
				

The following illustration shows the output of the preceding code.

Illustration showing a rectangle with red and green regions, then the same rectangle with the red region replaced with blue

Requirements

Minimum supported client

Windows XP, Windows 2000 Professional

Minimum supported server

Windows 2000 Server

Product

GDI+ 1.0

Header

Gdiplusimageattributes.h (include Gdiplus.h)

Library

Gdiplus.lib

DLL

Gdiplus.dll

See also

ImageAttributes
Bitmap
ImageAttributes::ClearRemapTable
Color
ColorAdjustType
ColorMap
Image
Metafile
Recoloring

 

 

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Build date: 3/6/2012

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