Unit Framebuffer
From Ultibo.org
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Description
Ultibo Framebuffer interface unit
To be documented
Constants
Framebuffer specific constants
FRAMEBUFFER_* FRAMEBUFFER_NAME_PREFIX = 'Framebuffer';
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Name prefix for Framebuffer Devices |
Framebuffer device type
FRAMEBUFFER_TYPE_* FRAMEBUFFER_TYPE_NONE = 0;
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FRAMEBUFFER_TYPE_HARDWARE = 1;
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FRAMEBUFFER_TYPE_VIRTUAL = 2;
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Framebuffer device state
FRAMEBUFFER_STATE_* FRAMEBUFFER_STATE_DISABLED = 0;
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FRAMEBUFFER_STATE_ENABLED = 1;
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Framebuffer cursor state
FRAMEBUFFER_CURSOR_* FRAMEBUFFER_CURSOR_DISABLED = 0;
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FRAMEBUFFER_CURSOR_ENABLED = 1;
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Framebuffer device flag
FRAMEBUFFER_FLAG_* FRAMEBUFFER_FLAG_NONE = $00000000;
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FRAMEBUFFER_FLAG_DMA = $00000001;
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If set the framebuffer supports DMA for read/write operations |
FRAMEBUFFER_FLAG_MARK = $00000002;
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If set the framebuffer requires mark after write operations |
FRAMEBUFFER_FLAG_COMMIT = $00000004;
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If set the framebuffer requires commit after write operations |
FRAMEBUFFER_FLAG_BLANK = $00000008;
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If set the framebuffer supports blanking the screen |
FRAMEBUFFER_FLAG_CACHED = $00000010;
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If set framebuffer is in cached memory and cache cleaning should be used |
FRAMEBUFFER_FLAG_SWAP = $00000020;
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If set framebuffer requires byte order of colors to be reversed (BGR <-> RGB) |
FRAMEBUFFER_FLAG_BACKLIGHT = $00000040;
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If set the framebuffer supports setting the backlight brightness |
FRAMEBUFFER_FLAG_VIRTUAL = $00000080;
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If set the framebuffer supports virtual width and height |
FRAMEBUFFER_FLAG_OFFSETX = $00000100;
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If set the framebuffer supports virtual offset X (Horizontal Pan/Flip etc) |
FRAMEBUFFER_FLAG_OFFSETY = $00000200;
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If set the framebuffer supports virtual offset Y (Vertical Pan/Flip etc) |
FRAMEBUFFER_FLAG_SYNC = $00000400;
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If set the framebuffer supports waiting for vertical sync |
FRAMEBUFFER_FLAG_CURSOR = $00000800;
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If set the framebuffer supports a hardware mouse cursor |
Framebuffer transfer flag
FRAMEBUFFER_TRANSFER_* FRAMEBUFFER_TRANSFER_NONE = $00000000;
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FRAMEBUFFER_TRANSFER_DMA = $00000001;
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Use DMA for transfer operations (Note: Buffers must be DMA compatible) |
Type definitions
Framebuffer palette
PFramebufferPalette = ^TFramebufferPalette;
TFramebufferPalette = record
Start:LongWord;
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The number of the first valid entry in the palette |
Count:LongWord;
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The total number of entries in the palette |
Entries:array[0..255] of LongWord;
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The palette entries in COLOR_FORMAT_DEFAULT format |
Framebuffer properties
PFramebufferProperties = ^TFramebufferProperties;
TFramebufferProperties = record
Flags:LongWord;
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Framebuffer device flags (eg FRAMEBUFFER_FLAG_COMMIT) (Ignored for Allocate/SetProperties) |
Address:LongWord;
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Framebuffer address (Ignored for Allocate/SetProperties) |
Size:LongWord;
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Framebuffer size (Bytes) (Ignored for Allocate/SetProperties) |
Pitch:LongWord;
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Framebuffer pitch (Bytes per Line) (Ignored for Allocate/SetProperties) |
Depth:LongWord;
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Framebuffer depth (Bits per Pixel)(8/16/24/32) |
Order:LongWord;
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Framebuffer pixel order (BGR/RGB) |
Mode:LongWord;
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Framebuffer alpha mode (Enabled/Reversed/Ignored) |
Format:LongWord;
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Framebuffer color format (eg COLOR_FORMAT_ARGB32) (Ignored for Allocate/SetProperties) |
PhysicalWidth:LongWord;
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Framebuffer Physical Width (Pixels) |
PhysicalHeight:LongWord;
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Framebuffer Physical Height (Pixels) |
VirtualWidth:LongWord;
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Framebuffer Virtual Width (Pixels) |
VirtualHeight:LongWord;
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Framebuffer Virtual Height (Pixels) |
OffsetX:LongWord;
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Framebuffer Virtual Offset X (Pixels) |
OffsetY:LongWord;
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Framebuffer Virtual Offset Y (Pixels) |
OverscanTop:LongWord;
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Framebuffer Overscan Top (Pixels) |
OverscanBottom:LongWord;
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Framebuffer Overscan Bottom (Pixels) |
OverscanLeft:LongWord;
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Framebuffer Overscan Left (Pixels) |
OverscanRight:LongWord;
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Framebuffer Overscan Right (Pixels) |
Rotation:LongWord;
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Framebuffer Rotation (eg FRAMEBUFFER_ROTATION_180) |
CursorX:LongWord;
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Framebuffer Cursor X (Pixels) (Ignored for Allocate / SetProperties) |
CursorY:LongWord;
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Framebuffer Cursor Y (Pixels) (Ignored for Allocate / SetProperties) |
CursorState:LongWord;
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Framebuffer Cursor State (eg FRAMEBUFFER_CURSOR_ENABLED) (Ignored for Allocate / SetProperties) |
Framebuffer enumeration callback
TFramebufferEnumerate = function(Framebuffer:PFramebufferDevice; Data:Pointer):LongWord;
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Framebuffer notification callback
TFramebufferNotification = function(Device:PDevice; Data:Pointer; Notification:LongWord):LongWord;
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Framebuffer device allocate
TFramebufferDeviceAllocate = function(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
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Framebuffer device release
TFramebufferDeviceRelease = function(Framebuffer:PFramebufferDevice):LongWord;
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Framebuffer device blank
TFramebufferDeviceBlank = function(Framebuffer:PFramebufferDevice; Blank:Boolean):LongWord;
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Framebuffer device read
TFramebufferDeviceRead = function(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Len,Flags:LongWord):LongWord;
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Framebuffer device write
TFramebufferDeviceWrite = function(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Len,Flags:LongWord):LongWord;
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Framebuffer device mark
TFramebufferDeviceMark = function(Framebuffer:PFramebufferDevice; X,Y,Width,Height,Flags:LongWord):LongWord;
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Framebuffer device commit
TFramebufferDeviceCommit = function(Framebuffer:PFramebufferDevice; Address,Size,Flags:LongWord):LongWord;
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Framebuffer device get rect
TFramebufferDeviceGetRect = function(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Width,Height,Skip,Flags:LongWord):LongWord;
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Framebuffer device put rect
TFramebufferDevicePutRect = function(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Width,Height,Skip,Flags:LongWord):LongWord;
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Framebuffer device copy rect
TFramebufferDeviceCopyRect = function(Framebuffer:PFramebufferDevice; X1,Y1,X2,Y2,Width,Height,Flags:LongWord):LongWord;
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Framebuffer device fill rect
TFramebufferDeviceFillRect = function(Framebuffer:PFramebufferDevice; X,Y,Width,Height,Color,Flags:LongWord):LongWord;
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Framebuffer device get line
TFramebufferDeviceGetLine = function(Framebuffer:PFramebufferDevice; Y:LongWord):Pointer;
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Framebuffer device get point
TFramebufferDeviceGetPoint = function(Framebuffer:PFramebufferDevice; X,Y:LongWord):Pointer;
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Framebuffer device wait sync
TFramebufferDeviceWaitSync = function(Framebuffer:PFramebufferDevice):LongWord;
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Framebuffer device get offset
TFramebufferDeviceGetOffset = function(Framebuffer:PFramebufferDevice; var X,Y:LongWord):LongWord;
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Framebuffer device set offset
TFramebufferDeviceSetOffset = function(Framebuffer:PFramebufferDevice; X,Y:LongWord;Pan:Boolean):LongWord;
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Framebuffer device get palette
TFramebufferDeviceGetPalette = function(Framebuffer:PFramebufferDevice; Palette:PFramebufferPalette):LongWord;
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Framebuffer device set palette
TFramebufferDeviceSetPalette = function(Framebuffer:PFramebufferDevice; Palette:PFramebufferPalette):LongWord;
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Framebuffer device set backlight
TFramebufferDeviceSetBacklight = function(Framebuffer:PFramebufferDevice; Brightness:LongWord):LongWord;
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Framebuffer device set cursor
TFramebufferDeviceSetCursor = function(Framebuffer:PFramebufferDevice; Width,Height,HotspotX,HotspotY:LongWord; Image:Pointer; Len:LongWord):LongWord;
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Framebuffer device update cursor
TFramebufferDeviceUpdateCursor = function(Framebuffer:PFramebufferDevice; Enabled:Boolean; X,Y:LongInt; Relative:Boolean):LongWord;
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Framebuffer device get properties
TFramebufferDeviceGetProperties = function(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
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Framebuffer device set properties
TFramebufferDeviceSetProperties = function(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
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Framebuffer device
PFramebufferDevice = ^TFramebufferDevice;
TFramebufferDevice = record
| Device Properties | |
Device:TDevice;
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The Device entry for this Framebuffer device |
| Framebuffer Properties | |
FramebufferId:LongWord;
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Unique Id of this Framebuffer device in the Framebuffer device table |
FramebufferState:LongWord;
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Framebuffer device state (eg FRAMEBUFFER_STATE_ENABLED) |
DeviceAllocate:TFramebufferDeviceAllocate;
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A device specific DeviceAllocate method implementing a standard framebuffer device interface (Mandatory) |
DeviceRelease:TFramebufferDeviceRelease;
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A device specific DeviceRelease method implementing a standard framebuffer device interface (Mandatory) |
DeviceBlank:TFramebufferDeviceBlank;
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A device specific DeviceBlank method implementing a standard framebuffer device interface (Optional) |
DeviceRead:TFramebufferDeviceRead;
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A device specific DeviceRead method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceWrite:TFramebufferDeviceWrite;
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A device specific DeviceWrite method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceMark:TFramebufferDeviceMark;
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A device specific DeviceMark method implementing a standard framebuffer device interface (Optional) |
DeviceCommit:TFramebufferDeviceCommit;
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A device specific DeviceCommit method implementing a standard framebuffer device interface (Optional) |
DeviceGetRect:TFramebufferDeviceGetRect;
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A device specific DeviceGetRect method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DevicePutRect:TFramebufferDevicePutRect;
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A device specific DevicePutRect method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceCopyRect:TFramebufferDeviceCopyRect;
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A device specific DeviceCopyRect method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceFillRect:TFramebufferDeviceFillRect;
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A device specific DeviceFillRect method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceGetLine:TFramebufferDeviceGetLine;
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A device specific DeviceGetLine method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceGetPoint:TFramebufferDeviceGetPoint;
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A device specific DeviceGetPoint method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceWaitSync:TFramebufferDeviceWaitSync;
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A device specific DeviceWaitSync method implementing a standard framebuffer device interface (Optional) |
DeviceGetOffset:TFramebufferDeviceGetOffset;
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A device specific DeviceGetOffset method implementing a standard framebuffer device interface (Optional) |
DeviceSetOffset:TFramebufferDeviceSetOffset;
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A device specific DeviceSetOffset method implementing a standard framebuffer device interface (Optional) |
DeviceGetPalette:TFramebufferDeviceGetPalette;
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A device specific DeviceGetPalette method implementing a standard framebuffer device interface (Optional) |
DeviceSetPalette:TFramebufferDeviceSetPalette;
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A device specific DeviceSetPalette method implementing a standard framebuffer device interface (Optional) |
DeviceSetBacklight:TFramebufferDeviceSetBacklight;
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A device specific DeviceSetBacklight method implementing a standard framebuffer device interface (Optional) |
DeviceSetCursor:TFramebufferDeviceSetCursor;
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A device specific DeviceSetCursor method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceUpdateCursor:TFramebufferDeviceUpdateCursor;
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A device specific DeviceUpdateCursor method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceGetProperties:TFramebufferDeviceGetProperties;
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A device specific DeviceGetProperties method implementing a standard framebuffer device interface (Or nil if the default method is suitable) |
DeviceSetProperties:TFramebufferDeviceSetProperties;
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A device specific DeviceSetProperties method implementing a standard framebuffer device interface (Mandatory) |
| Statistics Properties | |
AllocateCount:LongWord;
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ReleaseCount:LongWord;
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ReadCount:LongWord;
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WriteCount:LongWord;
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GetCount:LongWord;
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PutCount:LongWord;
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CopyCount:LongWord;
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FillCount:LongWord;
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| Driver Properties | |
Lock:TMutexHandle;
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Device lock |
Address:LongWord;
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Framebuffer address |
Size:LongWord;
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Framebuffer size (Bytes) |
Pitch:LongWord;
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Framebuffer pitch (Bytes per Line) |
Depth:LongWord;
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Framebuffer depth (Bits per Pixel)(8/16/24/32) |
Order:LongWord;
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Framebuffer pixel order (BGR/RGB) |
Mode:LongWord;
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Framebuffer alpha mode (Enabled/Reversed/Ignored) |
Format:LongWord;
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Framebuffer color format (eg COLOR_FORMAT_ARGB32) |
PhysicalWidth:LongWord;
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Framebuffer Physical Width (Pixels) |
PhysicalHeight:LongWord;
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Framebuffer Physical Height (Pixels) |
VirtualWidth:LongWord;
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Framebuffer Virtual Width (Pixels) |
VirtualHeight:LongWord;
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Framebuffer Virtual Height (Pixels) |
OffsetX:LongWord;
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Framebuffer Virtual Offset X (Pixels) |
OffsetY:LongWord;
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Framebuffer Virtual Offset Y (Pixels) |
OverscanTop:LongWord;
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Framebuffer Overscan Top (Pixels) |
OverscanBottom:LongWord;
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Framebuffer Overscan Bottom (Pixels) |
OverscanLeft:LongWord;
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Framebuffer Overscan Left (Pixels) |
OverscanRight:LongWord;
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Framebuffer Overscan Right (Pixels) |
Rotation:LongWord;
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Framebuffer Rotation (eg FRAMEBUFFER_ROTATION_180) |
CursorX:LongWord;
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Framebuffer Cursor X (Pixels) |
CursorY:LongWord;
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Framebuffer Cursor Y (Pixels) |
CursorState:LongWord;
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Framebuffer Cursor State (eg FRAMEBUFFER_CURSOR_ENABLED) |
| Buffer Properties | |
LineBuffer:Pointer;
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Buffer for line fills |
CopyBuffer:Pointer;
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Buffer for overlapped copy |
| Cursor Properties | |
CursorUpdate:LongBool;
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Flag to indicate if cursor update (Show/Hide) is in progress |
CursorImage:Pointer;
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Buffer for cursor image pixels (COLOR_FORMAT_DEFAULT) |
CursorInput:Pointer;
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Buffer for cursor image pixels (Native color format) |
CursorBuffer:Pointer;
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Buffer for pixels currently under cursor (Native color format) |
CursorOutput:Pointer;
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Buffer for cursor pixels currently displayed (Native color format) |
CursorWidth:LongWord;
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Framebuffer Cursor Width (Pixels) |
CursorHeight:LongWord;
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Framebuffer Cursor Height (Pixels) |
CursorHotspotX:LongWord;
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Framebuffer Cursor Hotspot X (Pixels) |
CursorHotspotY:LongWord;
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Framebuffer Cursor Hotspot Y (Pixels) |
| Internal Properties | |
Prev:PFramebufferDevice;
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Previous entry in Framebuffer device table |
Next:PFramebufferDevice;
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Next entry in Framebuffer device table |
Public variables
Initialization handlers
FramebufferInitHandler:TFramebufferInit;
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Function declarations
Initialization functions
procedure FramebufferInit;
Description: Initialize the Framebuffer unit and Framebuffer device table
| Note | Called only during system startup |
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Framebuffer functions
function FramebufferDeviceAllocate(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
Description: Allocate and enable a framebuffer device using supplied properties or defaults
| Framebuffer | The framebuffer device to allocate |
|---|---|
| Properties | The framebuffer properties (Width/Height/Depth etc) to use for allocation (Optional) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceRelease(Framebuffer:PFramebufferDevice):LongWord;
Description: Disable and release a framebuffer device
| Framebuffer | The framebuffer device to release |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceBlank(Framebuffer:PFramebufferDevice; Blank:Boolean):LongWord;
Description: Blank (Turn off) the display of a framebuffer device
| Framebuffer | The framebuffer device to blank |
|---|---|
| Blank | Turn off the display if True/Turn on the display if False |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support blank, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. Devices that support blank should set the flag FRAMEBUFFER_FLAG_BLANK. |
function FramebufferDeviceRead(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Len,Flags:LongWord):LongWord;
Description: Read one or more pixels from framebuffer device memory to a supplied buffer
| Framebuffer | The framebuffer device to read from |
|---|---|
| X | The column to start reading from |
| Y | The row to start reading from |
| Buffer | Pointer to a buffer to receive the read pixels |
| Len | The number of pixels to read starting at X,Y |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Pixel data will be returned in the color format of the framebuffer. The default method assumes that framebuffer memory is DMA coherent and does not require cache cleaning before a DMA read. |
function FramebufferDeviceWrite(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Len,Flags:LongWord):LongWord;
Description: Write one or more pixels to framebuffer device memory from a supplied buffer
| Framebuffer | The framebuffer device to write to |
|---|---|
| X | The column to start writing from |
| Y | The row to start writing from |
| Buffer | Pointer to a buffer containing the pixels to write |
| Len | The number of pixels to write starting at X,Y |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Caller must ensure pixel data is in the correct color format for the framebuffer. The default method assumes that framebuffer memory is DMA coherent and does not require cache invalidation after a DMA write. |
function FramebufferDeviceMark(Framebuffer:PFramebufferDevice; X,Y,Width,Height,Flags:LongWord):LongWord;
Description: Mark a region written to the framebuffer and signal the device to take any neccessary actions
| Framebuffer | The framebuffer device to mark |
|---|---|
| X | The starting column of the mark |
| Y | The starting row of the mark |
| Width | The number of columns to mark |
| Height | The number of rows to mark |
| Flags | The flags used for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support mark, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. Devices that support and require mark should set the flag FRAMEBUFFER_FLAG_MARK. |
function FramebufferDeviceCommit(Framebuffer:PFramebufferDevice; Address,Size,Flags:LongWord):LongWord;
Description: Commit a region written to the framebuffer and signal the device to take any neccessary actions
| Framebuffer | The framebuffer device to commit |
|---|---|
| Address | The starting address of the commit |
| Size | The size in bytes of the commit |
| Flags | The flags used for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support commit, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. Devices that support and require commit should set the flag FRAMEBUFFER_FLAG_COMMIT. |
function FramebufferDeviceGetRect(Framebuffer:PFramebufferDevice; X,Y:LongWord; Buffer:Pointer; Width,Height,Skip,Flags:LongWord):LongWord;
Description: Get a rectangular area of pixels from framebuffer memory to a supplied buffer
| Framebuffer | The framebuffer device to get from |
|---|---|
| X | The starting column of the get |
| Y | The starting row of the get |
| Buffer | Pointer to a block of memory large enough to hold the pixels in a contiguous block of rows |
| Width | The number of columns to get |
| Height | The number of rows to get |
| Skip | The number of pixels to skip in the buffer after each row (Optional) |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Pixel data will be returned in the color format of the framebuffer. The default method assumes that framebuffer memory is DMA coherent and does not require cache cleaning before a DMA read. |
function FramebufferDevicePutRect(Framebuffer:PFramebufferDevice; X,Y:LongWord;Buffer:Pointer; Width,Height,Skip,Flags:LongWord):LongWord;
Description: Put a rectangular area of pixels from a supplied buffer to framebuffer memory
| Framebuffer | The framebuffer device to put to |
|---|---|
| X | The starting column of the put |
| Y | The starting row of the put |
| Buffer | Pointer to a block of memory containing the pixels in a contiguous block of rows |
| Width | The number of columns to put |
| Height | The number of rows to put |
| Skip | The number of pixels to skip in the buffer after each row (Optional) |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Caller must ensure pixel data is in the correct color format for the framebuffer. The default method assumes that framebuffer memory is DMA coherent and does not require cache invalidation after a DMA write. |
function FramebufferDeviceCopyRect(Framebuffer:PFramebufferDevice; X1,Y1,X2,Y2,Width,Height,Flags:LongWord):LongWord;
Description: Copy a rectangular area of pixels within framebuffer memory
| Framebuffer | The framebuffer device to copy on |
|---|---|
| X1 | The starting column to copy from |
| Y1 | The starting row to copy from |
| X2 | The starting column to copy to |
| Y2 | The starting row to copy to |
| Width | The number of columns to copy |
| Height | The number of rows to copy |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | The default method assumes that framebuffer memory is DMA coherent and does not require cache clean/invalidate before or after a DMA read/write. |
function FramebufferDeviceFillRect(Framebuffer:PFramebufferDevice; X,Y,Width,Height,Color,Flags:LongWord):LongWord;
Description: Fill a rectangular area of pixels within framebuffer memory
| Framebuffer | The framebuffer device to fill on |
|---|---|
| X | The starting column of the fill |
| Y | The starting row of the fill |
| Width | The number of columns to fill |
| Height | The number of rows to fill |
| Color | The color to use for the fill |
| Flags | The flags for the transfer (eg FRAMEBUFFER_TRANSFER_DMA) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Color must be specified in the correct format for the framebuffer. The default method assumes that framebuffer memory is DMA coherent and does not require cache invalidation after a DMA write. |
function FramebufferDeviceGetLine(Framebuffer:PFramebufferDevice; Y:LongWord):Pointer;
Description: Get the address of the start of a row in framebuffer memory
| Framebuffer | The framebuffer device to get the start address from |
|---|---|
| Y | The row to get the start address of |
| Return | Pointer to the start address of the row or nil on failure |
function FramebufferDeviceGetPoint(Framebuffer:PFramebufferDevice; X,Y:LongWord):Pointer;
Description: Get the address of the specified row and column in framebuffer memory
| Framebuffer | The framebuffer device to get the address from |
|---|---|
| X | The column to get the start address of |
| Y | The row to get the start address of |
| Return | Pointer to the address of the row and column or nil on failure |
function FramebufferDeviceWaitSync(Framebuffer:PFramebufferDevice):LongWord;
Description: Wait for the next vertical sync signal from the display hardware
| Framebuffer | The framebuffer device to wait for |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support wait sync, returns ERROR_CALL_NOT_IMPLEMENTED if not supported.
Devices that support wait sync should set the flag FRAMEBUFFER_FLAG_SYNC |
function FramebufferDeviceGetOffset(Framebuffer:PFramebufferDevice; var X,Y:LongWord):LongWord;
Description: Get the virtual offset X and Y from a framebuffer device
| Framebuffer | The framebuffer device to get the offset from |
|---|---|
| X | The X (Column) offset value in pixels returned from the device if successful |
| Y | The Y (Row) offset value in pixels returned from the device if successful |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | X and Y are relative to the virtual buffer and NOT the physical screen (Where applicable)
Not all framebuffer devices support X and/or Y offset
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function FramebufferDeviceSetOffset(Framebuffer:PFramebufferDevice; X,Y:LongWord; Pan:Boolean):LongWord;
Description: Set the virtual offset X and Y of a framebuffer device
| Framebuffer | The framebuffer device to set the offset for |
|---|---|
| X | The X (Column) offset value in pixels to set |
| Y | The Y (Row) offset value in pixels to set |
| Pan | If True then pan the display without updating the Offset X and/or Y |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | X and Y are relative to the virtual buffer and NOT the physical screen (Where applicable)
Not all framebuffer devices support X and/or Y offset, returns ERROR_CALL_NOT_IMPLEMENTED if not supported
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function FramebufferDeviceGetPalette(Framebuffer:PFramebufferDevice; Palette:PFramebufferPalette):LongWord;
Description: Get the 8 bit color palette from a framebuffer device
| Framebuffer | The framebuffer device to get the palette from |
|---|---|
| Palette | Pointer to a TFramebufferPalette structure for the palette data |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support 8 bit palette, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. |
function FramebufferDeviceSetPalette(Framebuffer:PFramebufferDevice; Palette:PFramebufferPalette):LongWord;
Description: Set the 8 bit color palette of a framebuffer device
| Framebuffer | The framebuffer device to set the palette for |
|---|---|
| Palette | Pointer to a TFramebufferPalette structure for the palette data |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support 8 bit palette, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. |
function FramebufferDeviceSetBacklight(Framebuffer:PFramebufferDevice; Brightness:LongWord):LongWord;
Description: Set the brightness of the backlight of a framebuffer device
| Framebuffer | The framebuffer device to set the backlight |
|---|---|
| Brightness | The brightness value to set (Normally 0 to 100) |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Not all framebuffer devices support set backlight, returns ERROR_CALL_NOT_IMPLEMENTED if not supported. Devices that support set backlight should set the flag FRAMEBUFFER_FLAG_BACKLIGHT. |
function FramebufferDeviceSetCursor(Framebuffer:PFramebufferDevice; Width,Height,HotspotX,HotspotY:LongWord; Image:Pointer; Len:LongWord):LongWord;
Description: Set the mouse cursor image and properties of a framebuffer device
| Framebuffer | The framebuffer device to set the cursor |
|---|---|
| Width | The width of the cursor image in pixels |
| Height | The height of the cursor image in pixels |
| HotspotX | The X hotspot of the cursor image, where the cursor X location will be (Normally 0) |
| HotspotY | The Y hotspot of the cursor image, where the cursor Y location will be (Normally 0) |
| Image | A buffer containing the cursor image pixels in COLOR_FORMAT_DEFAULT format |
| Len | The length of the image buffer in bytes |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | For devices that don't support hardware mouse cursor a software cursor will be implemented
If image is nil then the default cursor image will be used |
function FramebufferDeviceUpdateCursor(Framebuffer:PFramebufferDevice; Enabled:Boolean; X,Y:LongInt; Relative:Boolean):LongWord;
Description: Update the position and state for the mouse cursor of a framebuffer device
| Framebuffer | The framebuffer device to update the cursor |
|---|---|
| Enabled | If true then show the cursor else hide it |
| X | The cursor X location in pixels |
| Y | The cursor Y location in pixels |
| Relative | If true then X and Y are considered relative to the current position |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | For devices that don't support hardware mouse cursor a software cursor will be implemented |
function FramebufferDeviceGetProperties(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
Description: Get the current properties from a framebuffer device
| Framebuffer | The framebuffer device to get properties from |
|---|---|
| Properties | Pointer to a TFramebufferProperties structure to return |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceSetProperties(Framebuffer:PFramebufferDevice; Properties:PFramebufferProperties):LongWord;
Description: Set the current properties for a framebuffer device
| Framebuffer | The framebuffer device to set properties for |
|---|---|
| Properties | Pointer to a TFramebufferProperties structure containing the properties |
| Return | ERROR_SUCCESS if completed or another error code on failure |
| Note | Changing certain properties may cause the framebuffer to be reallocated |
function FramebufferDeviceCheckFlag(Framebuffer:PFramebufferDevice; Flag:LongWord):Boolean;
Description: Check if a framebuffer device supports a flag value
| Framebuffer | The framebuffer device to check |
|---|---|
| Flag | The framebuffer flag to check (eg FRAMEBUFFER_FLAG_BACKLIGHT) |
| Return | True if flag is supported, False if not or on error |
function FramebufferDeviceGetFormat(Framebuffer:PFramebufferDevice):LongWord;
Description: Get the color format of a framebuffer device
| Framebuffer | The framebuffer device to get from |
|---|---|
| Return | The color format of the framebuffer (eg COLOR_FORMAT_RGB24) |
function FramebufferDeviceCreate:PFramebufferDevice;
Description: Create a new Framebuffer entry
| Return | Pointer to new Framebuffer entry or nil if Framebuffer could not be created |
|---|
function FramebufferDeviceCreateEx(Size:LongWord):PFramebufferDevice;
Description: Create a new Framebuffer entry
| Size | Size in bytes to allocate for new Framebuffer (Including the Framebuffer entry) |
|---|---|
| Return | Pointer to new Framebuffer entry or nil if Framebuffer could not be created |
function FramebufferDeviceDestroy(Framebuffer:PFramebufferDevice):LongWord;
Description: Destroy an existing Framebuffer entry
| Framebuffer | The framebuffer device to destroy |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceRegister(Framebuffer:PFramebufferDevice):LongWord;
Description: Register a new Framebuffer in the Framebuffer table
| Framebuffer | The framebuffer device to register |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceDeregister(Framebuffer:PFramebufferDevice):LongWord;
Description: Deregister a Framebuffer from the Framebuffer table
| Framebuffer | The framebuffer device to deregister |
|---|---|
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceFind(FramebufferId:LongWord):PFramebufferDevice;
Description: Find a framebuffer device by ID in the framebuffer table
| FramebufferId | The ID number of the framebuffer to find |
|---|---|
| Return | Pointer to framebuffer device entry or nil if not found |
function FramebufferDeviceFindByName(const Name:String):PFramebufferDevice; inline;
Description: Find a framebuffer device by name in the framebuffer table
| Name | The name of the framebuffer to find (eg Framebuffer0) |
|---|---|
| Return | Pointer to framebuffer device entry or nil if not found |
function FramebufferDeviceFindByDescription(const Description:String):PFramebufferDevice; inline;
Description: Find a framebuffer device by description in the framebuffer table
| Description | The description of the framebuffer to find (eg BCM2836 Framebuffer) |
|---|---|
| Return | Pointer to framebuffer device entry or nil if not found |
function FramebufferDeviceEnumerate(Callback:TFramebufferEnumerate; Data:Pointer):LongWord;
Description: Enumerate all framebuffer devices in the framebuffer table
| Callback | The callback function to call for each framebuffer in the table |
|---|---|
| Data | A private data pointer to pass to callback for each framebuffer in the table |
| Return | ERROR_SUCCESS if completed or another error code on failure |
function FramebufferDeviceNotification(Framebuffer:PFramebufferDevice; Callback:TFramebufferNotification; Data:Pointer; Notification,Flags:LongWord):LongWord;
Description: Register a notification for framebuffer device changes
| Framebuffer | The framebuffer device to notify changes for (Optional, pass nil for all framebuffer devices) |
|---|---|
| Callback | The function to call when a notification event occurs |
| Data | A private data pointer to pass to callback when a notification event occurs |
| Notification | The events to register for notification of (eg DEVICE_NOTIFICATION_REGISTER) |
| Flags | The flags to control the notification (eg NOTIFIER_FLAG_WORKER) |
RTL framebuffer functions
function SysFramebufferAvailable:Boolean;
Description: Check if a framebuffer device is available
| Note | None documented |
|---|
Framebuffer helper functions
function FramebufferDeviceGetCount:LongWord; inline;
Description: Get the current framebuffer device count
| Note | None documented |
|---|
function FramebufferDeviceGetDefault:PFramebufferDevice; inline;
Description: Get the current default framebuffer device
| Note | None documented |
|---|
function FramebufferDeviceSetDefault(Framebuffer:PFramebufferDevice):LongWord;
Description: Set the current default framebuffer device
| Note | None documented |
|---|
function FramebufferDeviceCheck(Framebuffer:PFramebufferDevice):PFramebufferDevice;
Description: Check if the supplied Framebuffer device is in the Framebuffer table
| Note | None documented |
|---|
function FramebufferDeviceSwap(Value:LongWord):LongWord; inline;
Description: No longer required (See ColorDefaultToFormat and ColorFormatToDefault)
| Note | None documented |
|---|
procedure FramebufferDeviceHideCursor(Framebuffer:PFramebufferDevice);
Description: Restore the framebuffer area under the cursor from the cursor buffer
| Note | Caller must hold the framebuffer lock
Driver support function only, not intended for direct use by applications |
|---|
procedure FramebufferDeviceShowCursor(Framebuffer:PFramebufferDevice);
Description: Save the framebuffer area under the cursor to the cursor buffer and merge the cursor input with it to create the cursor output. Put the output to the framebuffer
| Note | Caller must hold the framebuffer lock
Driver support function only, not intended for direct use by applications |
|---|
function FramebufferCursorToString(State:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function FramebufferDepthToString(Depth:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function FramebufferOrderToString(Order:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function FramebufferModeToString(Mode:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
function FramebufferRotationToString(Rotation:LongWord):String;
Description: To be documented
| Note | None documented |
|---|
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