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L_ColorResBitmapList

#include "l_bitmap.h"

L_LTKRN_API L_INT L_ColorResBitmapList(hList, nBitsPerPixel, uFlags, pPalette, hPalette, uColors)

Converts all bitmaps in a list from any bits-per-pixel to any bits-per-pixel.

Parameters

HBITMAPLIST hList

Handle to the list of bitmaps.

L_INT nBitsPerPixel

The number of bits per pixel to increase or decrease the bitmaps to. Valid values are 1, 2, 3, 4, 5, 6, 7, 8, 16, 24, 32, 48, and 64.

L_UINT uFlags

Processing options. Note that the palette and dithering options are useful only when the resulting bitmaps require a palette (when they are 8 bits per pixel or less). You can combine values when appropriate by using a bitwise OR ( | ). The following are valid values:

Value	Meaning
CRF_FIXEDPALETTE	[0x01] Use LEAD's fixed palette.
CRF_OPTIMIZEDPALETTE	[0x02] Create an optimized palette.
CRF_NETSCAPEPALETTE	[0x40] Use the fixed palette that is employed by Netscape Navigator and by Microsoft Internet Explorer.
CRF_USERPALETTE	[0x10] Use the palette specified in the `pPalette` parameter.
CRF_USERHPALETTE	[0x0100] Use the palette specified in the `hPalette` parameter, without supplying optimized colors. Please note that this cannot Or-ed with CRF_USERPALETTE.
CRF_IDENTITYPALETTE	[0x08] Insert the Windows system palette. You can combine this flag with CRF_OPTIMIZEDPALETTE.
CRF_FASTMATCHPALETTE	[0x20] Use a predefined table to speed conversion using your own palette. Refer to L_CreateUserMatchTable.
CRF_BYTEORDERBGR	[0x04] Use BGR color order. This flag only has meaning when going to 16 bits per pixel or higher.
CRF_BYTEORDERRGB	[0x00] Use RGB color. This flag only has meaning when going to 16 bits per pixel or higher.
CRF_BYTEORDERGRAY	[0x80] Grayscale.Destination bitmap should be 12 or 16-bit grayscale. 12 and 16-bit grayscale images are only supported in Document and Medical Imaging toolkits.
CRF_SLOWMATCH	[0x0200] Use with the CRF_OPTIMIZEDPALETTE flag to use a slower but more accurate matching process.
CRF_FAVORPURECOLORS	[0x0400] Give colors that occur frequently in the image palette entries of their own in the optimized palette.
CRF_NODITHERING	[0x00000000] Use nearest color matching.
CRF_FLOYDSTEINDITHERING	[0x00010000] Use Floyd-Steinberg dithering.
CRF_STUCKIDITHERING	[0x00020000] Use Stucki dithering.
CRF_BURKESDITHERING	[0x00030000] Use Burkes dithering.
CRF_SIERRADITHERING	[0x00040000] Use Sierra dithering.
CRF_STEVENSONARCEDITHERING	[0x00050000] Use Stevenson Arce dithering.
CRF_JARVISDITHERING	[0x00060000] Use Jarvis dithering.
CRF_ORDEREDDITHERING	[0x00070000] Use ordered dithering, which is faster but less accurate than other dithering methods.
CRF_CLUSTEREDDITHERING	[0x00080000] Use clustered dithering.
CRF_BYTEORDERROMM	[0x0800] Use ROMM color. This flag only has meaning when going to 24 or 48 bits per pixel.

L_RGBQUAD* pPalette

The custom palette to use. Specify this parameter as follows:

If you want to use the fixed palette or a fully optimized palette, pass NULL in this parameter and in hPalette.

If you want to supply the entire palette, specify CRF_USERPALETTE in the uFlags parameter and pass the address of your palette. Click here to see how to fill in the palette.

If you want the function to fill part of your palette with optimized colors, specify CRF_OPTIMIZEDPALETTE in the uFlags parameter and pass the address of your palette in pPalette and NULL in hPalette. Click here to see how to fill in the palette.

L_HPALETTE hPalette

The custom palette to use. Specify this parameter as follows:

If you want to use the fixed palette or a fully optimized palette, pass NULL in this parameter and in pPalette.

If you want to supply the entire palette, specify CRF_USERHPALETTE in the uFlags parameter and pass the handle of your palette. Click here to see how to fill in the palette.

If you want the function to fill part of your palette with optimized colors, specify CRF_OPTIMIZEDPALETTE in the uFlags parameter and pass NULL for pPalette and the handle of your palette in hPalette. Click here to see how to fill in the palette.

L_UINT uColors

The number of colors in the palette. Pass 0 to get the default (such as 256 for 8 bits per pixel). Otherwise, do one of the following:

If you specify a palette in the pPalette or hPalette parameter, pass the number of entries in your palette (including reserved entries).

If you specify NULL in the pPalette and in the hPalette parameters and you specify CRF_OPTIMIZEDPALETTE in the uFlags parameter, you can use this parameter to limit the number of colors that the function maps in the optimized palette.

Returns

Value	Meaning
SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

You can use this function to create an optimized palette for all bitmaps in the list.

NOTE: Using this function to change the color order of a 24-bit or 32-bit image (i.e. RGB to BGR) will have no effect on the image when painting or saving (to a file). If you want to change the visual appearance, you can simply swap the Order member of the BITMAPHANDLE.

Required DLLs and Libraries