Unit uBitmap

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Description

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Ultibo Bitmap utility unit

Functions to draw or save a standard bitmap image to or from an Ultibo graphics console window.

These functions originally appeared in the Ultibo forum and examples of how to use them can be found there:

• DrawBitmap - https://ultibo.org/forum/viewtopic.php?f=13&t=312

• SaveBitmap - https://ultibo.org/forum/viewtopic.php?f=13&t=313

Constants

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None defined

Type definitions

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None defined

Public variables

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None defined

Function declarations

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uBitmap functions

function DrawBitmap(Handle:TWindowHandle; const Filename:String; X,Y:LongWord):Boolean;

Description: A function for drawing a standard bitmap image onto an Ultibo graphics console window

Handle	The handle of an existing graphics console window
Filename	The name of the file to load the bitmap from
X	The column position for the left edge of the bitmap
Y	The row position for the top row of the bitmap
Return	True if successful or False if an error occurred

function DrawBitmapFromStream(Handle:TWindowHandle; Stream:TStream; X,Y:LongWord):Boolean;

Description: A function for drawing a standard bitmap image onto an Ultibo graphics console window from a stream

Handle	The handle of an existing graphics console window
Stream	A stream object containing the bitmap exactly as it would appear in a file (including the header etc)
X	The column position for the left edge of the bitmap
Y	The row position for the top row of the bitmap
Return	True if successful or False if an error occurred

function DrawBitmapFromBuffer(Handle:TWindowHandle; const Buf; Len,X,Y:LongWord):Boolean;

Description: A function for drawing a standard bitmap image onto an Ultibo graphics console window from a memory buffer

Handle	The handle of an existing graphics console window
Buf	A memory buffer containing the bitmap exactly as it would appear in a file (including the header etc)
X	The column position for the left edge of the bitmap
Y	The row position for the top row of the bitmap
Return	True if successful or False if an error occurred

function SaveBitmap(Handle:TWindowHandle; const Filename:String; X,Y,Width,Height,BPP:LongWord):Boolean;

Description: A function for saving all or part of an Ultibo graphics console window to a standard bitmap file

Handle	The handle of an existing graphics console window
Filename	The name of the file to save the bitmap to
X	The column position for the left edge of the bitmap
Y	The row position for the top row of the bitmap
Width	The width (in pixels) of the bitmap
Height	The height (in pixels) of the bitmap
BPP	The bits per pixel value for the bitmap (eg 16, 24 or 32)
Return	True if successful or False if an error occurred

function LoadBitmapToStream(const Filename:String; Stream:TStream; out Width,Height,Format:LongWord):Boolean;

Description: A function to extract a standard bitmap image into a stream object as a raw image and return the size and format

Filename	The name of the file to load the bitmap from
Stream	A stream object to receive the extracted image
Width	The width in pixels of the extracted image
Height	The height in pixels of the extracted image
Format	The color format of the extracted image (eg COLOR_FORMAT_RGB24)
Return	True if successful or False if an error occurred

function LoadBitmapToBuffer(const Filename:String; var Buf; var Len:LongWord; out Width,Height,Format:LongWord):Boolean;

Description: A function to extract a standard bitmap image into a memory buffer as a raw image and return the size and format

Filename	The name of the file to load the bitmap from
Buf	A memory buffer to receive the extracted image (Must be large enough to contain the extracted image)
Len	The size in bytes of the extracted image (Pass 0 to find how many bytes are required)
Width	The width in pixels of the extracted image
Height	The height in pixels of the extracted image
Format	The color format of the extracted image (eg COLOR_FORMAT_RGB24)
Return	True if successful or False if an error occurred

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