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MUI_Bitmap
The Bitmap class allows including self-made image data in MUI applications. Usually, image class was intended to be used for this purpose but unfortunately, its design was not very useful.
In its most simple usage, Bitmap class just display a given BitMap. However, you can also tell it to do automatic color remapping to match the current display context and you can define a transparent color to make the BitMap appear on any background.
| Attribute | Version | ISG | Type |
|---|---|---|---|
| MUIA_Bitmap_Alpha | V20 | ISG | ULONG |
| MUIA_Bitmap_Bitmap | V8 | ISG | struct BitMap * |
| MUIA_Bitmap_Height | V8 | ISG | LONG |
| MUIA_Bitmap_MappingTable | V8 | ISG | UBYTE * |
| MUIA_Bitmap_Precision | V11 | ISG | LONG |
| MUIA_Bitmap_RemappedBitmap | V11 | ..G | struct BitMap * |
| MUIA_Bitmap_SourceColors | V8 | ISG | ULONG * |
| MUIA_Bitmap_Transparent | V8 | ISG | LONG |
| MUIA_Bitmap_UseFriend | V11 | I.. | BOOL |
| MUIA_Bitmap_Width | V8 | ISG | LONG |
MUIA_Bitmap_Alpha -- V20 [ISG], ULONG, 0x80423e71
If specified, MUI will consider the BitMap to contain alpha informations. The only supported BitMap format is 32-bit ARGB. The value of MUIA_Bitmap_Alpha is an ULONG specifying the intensity of the alpha blitting. You usually want to specify 0xffffffff. Alpha blitting won't work on CLUT screens.
MUIA_Bitmap_Bitmap, MUIA_Bitmap_Height, MUIA_Bitmap_Width
MUIA_Bitmap_Bitmap -- V8 [ISG], struct BitMap *, 0x804279bd
This attribute specifies a pointer to a struct BitMap. Note that specifying only a BitMap isn't enough, you have to tell MUI about the pixel width and height with MUIA_Bitmap_Width and MUIA_Bitmap_Height, too.
If you plan to dynamically modify either the bitmap or any other visibile stuff you will need to cause the surrounding group to do a full relayout by first removing the Bitmap object, then set the new attributes and finally readd the Bitmap object.
MUIA_Bitmap_Width, MUIA_Bitmap_Height, MUIA_Bitmap_Transparent, MUIA_Bitmap_SourceColors, MUIA_Bitmap_MappingTable
MUIA_Bitmap_Height -- V8 [ISG], LONG, 0x80421560
Define the pixel height of the BitMap.
Note: By default, the bitmap object has a minimum size of 1 pixel and an unlimited maxium size. If the space is too small to hold your BitMap, it will be clipped. Usually, you will use MUIA_FixWidth and MUIA_FixHeight with BitMap objects to make them always exactly as big as the bitmap.
MUIA_Bitmap_Bitmap, MUIA_Bitmap_Width, MUIA_Bitmap_Transparent, MUIA_Bitmap_SourceColors, MUIA_Bitmap_MappingTable
MUIA_Bitmap_MappingTable -- V8 [ISG], UBYTE *, 0x8042e23d
Address of an array of UBYTEs, one for each color of the source BitMap. MUI will remap the BitMap according to the contents of the array.
Since MUI applications usually don't know about their display environment, this tag is rarely used. Instead, MUIA_Bitmap_SourceColors can be used to allow context sensitive color remapping.
MUIA_Bitmap_Bitmap, MUIA_Bitmap_Height, MUIA_Bitmap_Width, MUIA_Bitmap_Transparent
MUIA_Bitmap_Precision -- V11 [ISG], LONG, 0x80420c74
Specify the precision value for remapping images. Use the same predefined values as for ObtainBestPen() here, e.g.
- PRECISION_EXACT
- PRECISION_IMAGE
- PRECISION_ICON
- PRECISION_GUI
MUIA_Bitmap_RemappedBitmap -- V11 [..G], struct BitMap *, 0x80423a47
Between MUIM_Setup and MUIM_Cleanup, this attribute will hold a pointer to the remapped bitmap.
MUIA_Bitmap_SourceColors -- V8 [ISG], ULONG *, 0x80425360
This attribute defines the color palette of the source BitMap. If specified, MUI will try to locate these colors on the current screen and remap the BitMap accordingly.
You can e.g. specify some great looking 8-color images for several buttons of your application and MUI will ensure they look fine even on 4-color screens or on screens with completely different colors.
When running Kickstart V39 or higher, MUI will use ObtainBestPen() to find or create your colors. Below V39, a simple color-map search is performed to find the best matching entry, but no colors will be changed.
The source palette is specified with an array of ULONGs, three entries per color, 32 bits per gun.
/* MagicWB-like palette for an 8-color image */
const ULONG aboutlogo_colors[24] =
{
0xaaaaaaaa, 0xaaaaaaaa, 0xa0a0a0a0,
0x00000000, 0x00000000, 0x00000000,
0xffffffff, 0xffffffff, 0xffffffff,
0x66666666, 0x88888888, 0xbbbbbbbb,
0x99999999, 0x99999999, 0x99999999,
0xbbbbbbbb, 0xbbbbbbbb, 0xbbbbbbbb,
0xbbbbbbbb, 0xaaaaaaaa, 0x99999999,
0xffffffff, 0xbbbbbbbb, 0xaaaaaaaa
};MUIA_Bitmap_Bitmap, MUIA_Bitmap_Height, MUIA_Bitmap_Width, MUIA_Bitmap_MappingTable, MUIA_Bitmap_MappingTable
MUIA_Bitmap_Transparent -- V8 [ISG], LONG, 0x80422805
If specified, MUI will consider this color of the BitMap to be transparent. A mask plane will be generated and used for blitting, the background will shine through.
Currently, only 0 is supported, i.e. only color 0 can be made the "shine through" color.
MUIA_Bitmap_Bitmap, MUIA_Bitmap_Height, MUIA_Bitmap_Width, MUIA_Bitmap_SourceColors, MUIA_Bitmap_MappingTable
MUIA_Bitmap_UseFriend -- V11 [I..], BOOL, 0x804239d8
This attribute will make MUI to try to allocate the remapped bitmap in a way that allows fastest displaying.
MUIA_Bitmap_Width -- V8 [ISG], LONG, 0x8042eb3a
Define the pixel width of the BitMap.
Note: By default, the bitmap object has a minimum size of 1 pixel and an unlimited maxium size. If the space is too small to hold your BitMap, it will be clipped. Usually, you will use MUIA_FixWidth and MUIA_FixHeight with BitMap objects to make them always exactly as big as the bitmap.
MUIA_Bitmap_Bitmap, MUIA_Bitmap_Height, MUIA_Bitmap_Transparent, MUIA_Bitmap_SourceColors, MUIA_Bitmap_MappingTable
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Updated: 11-Oct-2021 |