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|
{
fpGUI - Free Pascal GUI Library
GFXBase - Abstract declarations to be implemented on each platform
Copyright (C) 2000 - 2006 See the file AUTHORS, included in this
distribution, for details of the copyright.
See the file COPYING.modifiedLGPL, included in this distribution,
for details about redistributing fpGUI.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
}
unit GfxBase;
{$IFDEF Debug}
{$ASSERTIONS On}
{$ENDIF}
{$ifdef fpc}
{$mode objfpc}{$H+}
{$endif}
interface
uses
SysUtils,
Classes;
{$INCLUDE keys.inc}
resourcestring
// Exception message strings, to be used by target implementations
SUnsupportedPixelFormat = 'Pixel format (%d bits/pixel) is not supported';
SIncompatibleCanvasForBlitting = 'Cannot blit from %s to %s';
type
TSize = record
cx, cy: Integer;
end;
{ We use a special 3x3 matrix for transformations of coordinates. As the
only allowed transformations are translations and scalations, we need a
matrix with the following content ([x,y] is a variable):
[0,0] 0 [2,0]
0 [1,1] [2,1]
0 0 1
[0,0]: X scalation
[2,0]: X translation
[1,1]: Y scalation
[2,1]: Y translation
NOTE: This may change in the future! Don't assume anything about the
structure of TGfxMatrix! TGfxCanvas only allows you to read and
write the current transformation matrix so that the matrix can
easily be saved and restored.
}
TGfxMatrix = record
_00, _20, _11, _21: Integer;
end;
const
GfxIdentityMatrix: TGfxMatrix = (_00: 1; _20: 0; _11: 1; _21: 0);
type
PGfxColor = ^TGfxColor;
TGfxColor = packed record
Red, Green, Blue, Alpha: Word;
end;
PGfxPixel = ^TGfxPixel;
TGfxPixel = LongWord;
TGfxFormatType = (
ftInvalid,
ftMono, // Monochrome
ftPal4, // 4 bpp using palette
ftPal4A, // 4 bpp using palette with alpha values > 0
ftPal8, // 8 bpp using palette
ftPal8A, // 8 bpp using palette with alpha values > 0
ftRGB16, // 15/16 bpp RGB
ftRGBA16, // 16 bpp RGBA
ftRGB24, // 24 bpp RGB
ftRGB32, // 32 bpp RGB
ftRGBA32); // 32 bpp RGBA
TGfxPixelFormat = record
case FormatType: TGfxFormatType of
ftRGB16, ftRGBA16, ftRGB24, ftRGB32, ftRGBA32: (
RedMask: TGfxPixel;
GreenMask: TGfxPixel;
BlueMask: TGfxPixel;
AlphaMask: TGfxPixel); // only used for RGBA types
end;
const
FormatTypeBPPTable: array[TGfxFormatType] of Integer =
(0, 1, 4, 4, 8, 8, 16, 16, 24, 32, 32);
{ Predefined colors }
colTransparent: TGfxColor = (Red: $0000; Green: $0000; Blue: $0000; Alpha: $ffff);
colBlack: TGfxColor = (Red: $0000; Green: $0000; Blue: $0000; Alpha: $0000);
colBlue: TGfxColor = (Red: $0000; Green: $0000; Blue: $ffff; Alpha: $0000);
colGreen: TGfxColor = (Red: $0000; Green: $ffff; Blue: $0000; Alpha: $0000);
colCyan: TGfxColor = (Red: $0000; Green: $ffff; Blue: $ffff; Alpha: $0000);
colRed: TGfxColor = (Red: $ffff; Green: $0000; Blue: $0000; Alpha: $0000);
colMagenta: TGfxColor = (Red: $ffff; Green: $0000; Blue: $ffff; Alpha: $0000);
colYellow: TGfxColor = (Red: $ffff; Green: $ffff; Blue: $0000; Alpha: $0000);
colWhite: TGfxColor = (Red: $ffff; Green: $ffff; Blue: $ffff; Alpha: $0000);
colGray: TGfxColor = (Red: $8000; Green: $8000; Blue: $8000; Alpha: $0000);
colLtGray: TGfxColor = (Red: $c000; Green: $c000; Blue: $c000; Alpha: $0000);
colDkBlue: TGfxColor = (Red: $0000; Green: $0000; Blue: $8000; Alpha: $0000);
colDkGreen: TGfxColor = (Red: $0000; Green: $8000; Blue: $0000; Alpha: $0000);
colDkCyan: TGfxColor = (Red: $0000; Green: $8000; Blue: $8000; Alpha: $0000);
colDkRed: TGfxColor = (Red: $8000; Green: $0000; Blue: $0000; Alpha: $0000);
colDkMagenta: TGfxColor = (Red: $8000; Green: $0000; Blue: $8000; Alpha: $0000);
colDkYellow: TGfxColor = (Red: $8000; Green: $8000; Blue: $0000; Alpha: $0000);
webBlack: TGfxColor = (Red: $0000; Green: $0000; Blue: $0000; Alpha: $0000);
webMaroon: TGfxColor = (Red: $8000; Green: $0000; Blue: $0000; Alpha: $0000);
webGreen: TGfxColor = (Red: $0000; Green: $8000; Blue: $0000; Alpha: $0000);
webOlive: TGfxColor = (Red: $8000; Green: $8000; Blue: $0000; Alpha: $0000);
webNavy: TGfxColor = (Red: $0000; Green: $0000; Blue: $8000; Alpha: $0000);
webPurple: TGfxColor = (Red: $8000; Green: $0000; Blue: $8000; Alpha: $0000);
webTeal: TGfxColor = (Red: $0000; Green: $8000; Blue: $8000; Alpha: $0000);
webGray: TGfxColor = (Red: $8000; Green: $8000; Blue: $8000; Alpha: $0000);
webSilver: TGfxColor = (Red: $c000; Green: $c000; Blue: $c000; Alpha: $0000);
webRed: TGfxColor = (Red: $ffff; Green: $0000; Blue: $0000; Alpha: $0000);
webLime: TGfxColor = (Red: $0000; Green: $ffff; Blue: $0000; Alpha: $0000);
webYellow: TGfxColor = (Red: $ffff; Green: $ffff; Blue: $0000; Alpha: $0000);
webBlue: TGfxColor = (Red: $0000; Green: $0000; Blue: $ffff; Alpha: $0000);
webFuchsia: TGfxColor = (Red: $ffff; Green: $0000; Blue: $ffff; Alpha: $0000);
webAqua: TGfxColor = (Red: $0000; Green: $ffff; Blue: $ffff; Alpha: $0000);
webWhite: TGfxColor = (Red: $ffff; Green: $ffff; Blue: $ffff; Alpha: $0000);
// Some predefined pixel formats:
PixelFormatMono: TGfxPixelFormat = (
FormatType: ftMono;
RedMask: 0;
GreenMask: 0;
BlueMask: 0;
AlphaMask: 0);
PixelFormatPal4: TGfxPixelFormat = (
FormatType: ftPal4;
RedMask: 0;
GreenMask: 0;
BlueMask: 0;
AlphaMask: 0);
PixelFormatPal4A: TGfxPixelFormat = (
FormatType: ftPal4A;
RedMask: 0;
GreenMask: 0;
BlueMask: 0;
AlphaMask: 0);
PixelFormatPal8: TGfxPixelFormat = (
FormatType: ftPal8;
RedMask: 0;
GreenMask: 0;
BlueMask: 0;
AlphaMask: 0);
PixelFormatPal8A: TGfxPixelFormat = (
FormatType: ftPal8A;
RedMask: 0;
GreenMask: 0;
BlueMask: 0;
AlphaMask: 0);
PixelFormatRGB24: TGfxPixelFormat = (
FormatType: ftRGB24;
RedMask: $0000ff;
GreenMask: $00ff00;
BlueMask: $ff0000;
AlphaMask: 0);
PixelFormatBGR24: TGfxPixelFormat = (
FormatType: ftRGB24;
RedMask: $ff0000;
GreenMask: $00ff00;
BlueMask: $0000ff;
AlphaMask: 0);
PixelFormatRGB32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $0000ff;
GreenMask: $00ff00;
BlueMask: $ff0000;
AlphaMask: 0);
PixelFormatRGBA32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $000000ff;
GreenMask: $0000ff00;
BlueMask: $00ff0000;
AlphaMask: $ff000000);
PixelFormatARGB32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $0000ff00;
GreenMask: $00ff0000;
BlueMask: $ff000000;
AlphaMask: $000000ff);
PixelFormatBGR32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $ff0000;
GreenMask: $00ff00;
BlueMask: $0000ff;
AlphaMask: 0);
PixelFormatBGRA32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $00ff0000;
GreenMask: $0000ff00;
BlueMask: $000000ff;
AlphaMask: $ff000000);
PixelFormatABGR32: TGfxPixelFormat = (
FormatType: ftRGB32;
RedMask: $ff000000;
GreenMask: $00ff0000;
BlueMask: $0000ff00;
AlphaMask: $000000ff);
type
EGfxError = class(Exception);
EGfxUnsupportedPixelFormat = class(EGfxError)
constructor Create(const APixelFormat: TGfxPixelFormat);
end;
TFCustomImage = class;
TFCustomApplication = class;
TFCustomWindow = class;
TGfxWindowOption = (
woWindow, woBorderless, woPopup, woToolWindow, woChildWindow,
woX11SkipWMHints);
TGfxWindowOptions = set of TGfxWindowOption;
TGfxCursor = (crDefault, crNone, crArrow, crCross, crIBeam, crSize, crSizeNS,
crSizeWE, cpUpArrow, crHourGlass, crNoDrop, crHelp);
{ TFCustomFont }
TGfxFontClass = (fcSerif, fcSansSerif, fcTypewriter, fcDingbats);
TFCustomFont = class
protected
FHandle: Cardinal;
public
class function GetDefaultFontName(const AFontClass: TGfxFontClass): String; virtual;
property Handle: Cardinal read FHandle;
end;
{ TGfxPalette }
TGfxPalette = class
private
FRefCount: LongInt;
FEntryCount: Integer;
FEntries: PGfxColor;
function GetEntry(AIndex: Integer): TGfxColor;
public
constructor Create(AEntryCount: Integer; AEntries: PGfxColor);
destructor Destroy; override;
procedure AddRef;
procedure Release;
property EntryCount: Integer read FEntryCount;
property Entries[AIndex: Integer]: TGfxColor read GetEntry;
end;
{ TFCustomCanvas }
TGfxLineStyle = (lsSolid, lsDot);
TFCustomCanvas = class(TObject)
private
FMatrix: TGfxMatrix;
protected
FWidth: Integer;
FHeight: Integer;
FPixelFormat: TGfxPixelFormat;
function DoExcludeClipRect(const ARect: TRect): Boolean; virtual; abstract;
function DoIntersectClipRect(const ARect: TRect): Boolean; virtual; abstract;
function DoUnionClipRect(const ARect: TRect): Boolean; virtual; abstract;
function DoGetClipRect: TRect; virtual; abstract;
procedure DoDrawArc(const ARect: TRect; StartAngle, EndAngle: Single); virtual; abstract;
procedure DoDrawCircle(const ARect: TRect); virtual; abstract;
procedure DoDrawLine(const AFrom, ATo: TPoint); virtual; abstract;
procedure DoDrawRect(const ARect: TRect); virtual;
procedure DoDrawPoint(const APoint: TPoint); virtual; abstract;
procedure DoFillRect(const ARect: TRect); virtual; abstract;
procedure DoTextOut(const APosition: TPoint; const AText: String); virtual; abstract;
procedure DoCopyRect(ASource: TFCustomCanvas; const ASourceRect: TRect; const ADestPos: TPoint); virtual; abstract;
procedure DoMaskedCopyRect(ASource, AMask: TFCustomCanvas; const ASourceRect: TRect; const AMaskPos, ADestPos: TPoint); virtual; abstract;
procedure DoDrawImageRect(AImage: TFCustomImage; ASourceRect: TRect; const ADestPos: TPoint); virtual; abstract;
public
constructor Create;
// Transformations
function Transform(APoint: TPoint): TPoint;
function Transform(ARect: TRect): TRect;
function ReverseTransform(APoint: TPoint): TPoint;
function ReverseTransform(ARect: TRect): TRect;
procedure AppendTranslation(ADelta: TPoint);
// Graphics state
procedure SaveState; virtual; abstract;
procedure RestoreState; virtual; abstract;
procedure EmptyClipRect; virtual;
procedure SetColor_(AColor: TGfxPixel); virtual; abstract;
procedure SetColor(AColor: TGfxColor); virtual;
procedure SetFont(AFont: TFCustomFont); virtual; abstract;
procedure SetLineStyle(ALineStyle: TGfxLineStyle); virtual; abstract;
function ExcludeClipRect(const ARect: TRect): Boolean;
function IntersectClipRect(const ARect: TRect): Boolean;
function UnionClipRect(const ARect: TRect): Boolean;
function GetClipRect: TRect;
function MapColor(const AColor: TGfxColor): TGfxPixel; virtual; abstract;
// Drawing functions
procedure DrawArc(const ARect: TRect; StartAngle, EndAngle: Single);
procedure DrawCircle(const ARect: TRect);
procedure DrawLine(const AFrom, ATo: TPoint);
procedure DrawPolyLine(const Coords: array of TPoint); virtual;
procedure DrawRect(const ARect: TRect);
procedure DrawPoint(const APoint: TPoint);
procedure FillRect(const ARect: TRect);
// Fonts
function FontCellHeight: Integer; virtual; abstract;
function TextExtent(const AText: String): TSize; virtual;
function TextWidth(const AText: String): Integer; virtual;
procedure TextOut(const APosition: TPoint; const AText: String);
// Bit block transfers
procedure Copy(ASource: TFCustomCanvas; const ADestPos: TPoint); virtual;
procedure CopyRect(ASource: TFCustomCanvas; const ASourceRect: TRect; const ADestPos: TPoint);
procedure MaskedCopy(ASource, AMask: TFCustomCanvas; const ADestPos: TPoint);
{!!!: procedure MaskedCopyRect(ASource, AMask: TGfxCanvas; const ASourceRect: TRect;
const ADestPos: TPoint); virtual;}
procedure MaskedCopyRect(ASource, AMask: TFCustomCanvas; const ASourceRect: TRect; const AMaskPos, ADestPos: TPoint);
// Image drawing
procedure DrawImage(AImage: TFCustomImage; const ADestPos: TPoint);
procedure DrawImageRect(AImage: TFCustomImage; ASourceRect: TRect; const ADestPos: TPoint);
// Properties
property Width: Integer read FWidth;
property Height: Integer read FHeight;
property PixelFormat: TGfxPixelFormat read FPixelFormat;
property Matrix: TGfxMatrix read FMatrix write FMatrix;
end;
TFCustomImage = class(TObject)
private
FWidth, FHeight: Integer;
FPixelFormat: TGfxPixelFormat;
FPalette: TGfxPalette;
procedure SetPalette(APalette: TGfxPalette);
protected
public
constructor Create(AWidth, AHeight: Integer; APixelFormat: TGfxPixelFormat); virtual;
destructor Destroy; override;
procedure Lock(var AData: Pointer; var AStride: LongWord); virtual; abstract;
procedure Unlock; virtual;
procedure SetPixelsFromData(AData: Pointer; AStride: LongWord);
property Width: Integer read FWidth;
property Height: Integer read FHeight;
property PixelFormat: TGfxPixelFormat read FPixelFormat;
property Palette: TGfxPalette read FPalette write SetPalette;
end;
{ TFCustomScreen }
TFCustomScreen = class(TObject)
public
constructor Create; virtual;
end;
{ TFCustomApplication }
TFCustomApplication = class(TComponent)
private
FOnIdle: TNotifyEvent;
FQuitWhenLastWindowCloses: Boolean;
public
Forms: TList;
public
{ Default methods }
constructor Create; virtual;
destructor Destroy; override;
procedure AddWindow(AWindow: TFCustomWindow); virtual; abstract;
procedure Initialize(ADisplayName: String = ''); virtual; abstract;
procedure Run; virtual; abstract;
procedure Quit; virtual; abstract;
{ Properties }
property OnIdle: TNotifyEvent read FOnIdle write FOnIdle;
property QuitWhenLastWindowCloses: Boolean read FQuitWhenLastWindowCloses write FQuitWhenLastWindowCloses;
end;
{ TFCustomWindow }
// Lifetime handling
TGfxCanCloseEvent = function(Sender: TObject): Boolean of object;
// Keyboard
TGfxKeyEvent = procedure(Sender: TObject; AKey: Word; AShift: TShiftState) of object;
TGfxKeyCharEvent = procedure(Sender: TObject; AKeyChar: Char) of object;
// Mouse
TMouseButton = (mbLeft, mbRight, mbMiddle);
TGfxMouseButtonEvent = procedure(Sender: TObject; AButton: TMouseButton; AShift: TShiftState; const AMousePos: TPoint) of object;
TGfxMouseMoveEvent = procedure(Sender: TObject; AShift: TShiftState; const AMousePos: TPoint) of object;
TGfxMouseWheelEvent = procedure(Sender: TObject; AShift: TShiftState; AWheelDelta: Single; const AMousePos: TPoint) of object;
// Painting
TGfxPaintEvent = procedure(Sender: TObject; const ARect: TRect) of object;
TFCustomWindow = class
private
FCursor: TGfxCursor;
FOnCreate: TNotifyEvent;
FOnCanClose: TGfxCanCloseEvent;
FOnClose: TNotifyEvent;
FOnFocusIn: TNotifyEvent;
FOnFocusOut: TNotifyEvent;
FOnHide: TNotifyEvent;
FOnKeyPressed: TGfxKeyEvent;
FOnKeyReleased: TGfxKeyEvent;
FOnKeyChar: TGfxKeyCharEvent;
FOnMouseEnter: TGfxMouseMoveEvent;
FOnMouseLeave: TNotifyEvent;
FOnMousePressed: TGfxMouseButtonEvent;
FOnMouseReleased: TGfxMouseButtonEvent;
FOnMouseMove: TGfxMouseMoveEvent;
FOnMouseWheel: TGfxMouseWheelEvent;
FOnPaint: TGfxPaintEvent;
FOnMove: TNotifyEvent;
FOnResize: TNotifyEvent;
FOnShow: TNotifyEvent;
procedure SetWidth(AWidth: Integer);
procedure SetHeight(AHeight: Integer);
procedure SetCursor(ACursor: TGfxCursor);
procedure SetWindowOptions(const AValue: TGfxWindowOptions); virtual;
protected
FHandle: Cardinal;
FCanvas: TFCustomCanvas;
FLeft: Integer;
FTop: Integer;
FWidth: Integer;
FHeight: Integer;
FClientWidth: Integer;
FClientHeight: Integer;
FWindowOptions: TGfxWindowOptions;
function GetTitle: String; virtual;
procedure SetTitle(const ATitle: String); virtual;
procedure DoSetCursor; virtual; abstract;
public
function CanClose: Boolean; virtual;
procedure SetPosition(const APosition: TPoint); virtual;
procedure SetSize(const ASize: TSize); virtual;
procedure SetMinMaxSize(const AMinSize, AMaxSize: TSize); virtual;
procedure SetFixedSize(const ASize: TSize);
procedure SetClientSize(const ASize: TSize); virtual;
procedure SetMinMaxClientSize(const AMinSize, AMaxSize: TSize); virtual;
procedure SetFixedClientSize(const ASize: TSize);
procedure Show; virtual; abstract;
procedure Invalidate(const ARect: TRect); virtual; abstract;
procedure PaintInvalidRegion; virtual; abstract;
procedure CaptureMouse; virtual; abstract;
procedure ReleaseMouse; virtual; abstract;
property WindowOptions: TGfxWindowOptions read FWindowOptions write SetWindowOptions;
property Canvas: TFCustomCanvas read FCanvas;
property Handle: Cardinal read FHandle;
// Window state
property Left: Integer read FLeft;
property Top: Integer read FTop;
property Width: Integer read FWidth write SetWidth;
property Height: Integer read FHeight write SetHeight;
property ClientWidth: Integer read FClientWidth;
property ClientHeight: Integer read FClientHeight;
property Cursor: TGfxCursor read FCursor write SetCursor;
property Title: String read GetTitle write SetTitle;
// Event handlers
property OnCreate: TNotifyEvent read FOnCreate write FOnCreate;
property OnCanClose: TGfxCanCloseEvent read FOnCanClose write FOnCanClose;
property OnClose: TNotifyEvent read FOnClose write FOnClose;
property OnFocusIn: TNotifyEvent read FOnFocusIn write FOnFocusIn;
property OnFocusOut: TNotifyEvent read FOnFocusOut write FOnFocusOut;
property OnHide: TNotifyEvent read FOnHide write FOnHide;
property OnKeyPressed: TGfxKeyEvent read FOnKeyPressed write FOnKeyPressed;
property OnKeyReleased: TGfxKeyEvent read FOnKeyReleased write FOnKeyReleased;
property OnKeyChar: TGfxKeyCharEvent read FOnKeyChar write FOnKeyChar;
property OnMouseEnter: TGfxMouseMoveEvent read FOnMouseEnter write FOnMouseEnter;
property OnMouseLeave: TNotifyEvent read FOnMouseLeave write FOnMouseLeave;
property OnMousePressed: TGfxMouseButtonEvent read FOnMousePressed write FOnMousePressed;
property OnMouseReleased: TGfxMouseButtonEvent read FOnMouseReleased write FOnMouseReleased;
property OnMouseMove: TGfxMouseMoveEvent read FOnMouseMove write FOnMouseMove;
property OnMouseWheel: TGfxMouseWheelEvent read FOnMouseWheel write FOnMouseWheel;
property OnPaint: TGfxPaintEvent read FOnPaint write FOnPaint;
property OnMove: TNotifyEvent read FOnMove write FOnMove;
property OnResize: TNotifyEvent read FOnResize write FOnResize;
property OnShow: TNotifyEvent read FOnShow write FOnShow;
end;
// Some helpers:
// Sizes, points etc.
function Size(AWidth, AHeight: Integer): TSize;
function Size(ARect: TRect): TSize;
function PtInRect(const ARect: TRect; const APoint: TPoint): Boolean;
{$ifdef fpc}
operator = (const ASize1, ASize2: TSize) b: Boolean;
operator + (const APoint1, APoint2: TPoint) p: TPoint;
operator + (const APoint: TPoint; ASize: TSize) p: TPoint;
operator + (const ASize: TSize; APoint: TPoint) s: TSize;
operator + (const ASize1, ASize2: TSize) s: TSize;
operator + (const APoint: TPoint; i: Integer) p: TPoint;
operator + (const ASize: TSize; i: Integer) s: TSize;
operator - (const APoint1, APoint2: TPoint) p: TPoint;
operator - (const APoint: TPoint; i: Integer) p: TPoint;
operator - (const ASize: TSize; const APoint: TPoint) s: TSize;
operator - (const ASize: TSize; i: Integer) s: TSize;
// Colors
operator = (const AColor1, AColor2: TGfxColor) b: Boolean;
{$endif}
function GetAvgColor(const AColor1, AColor2: TGfxColor): TGfxColor;
// Keyboard
function KeycodeToText(Key: Word; ShiftState: TShiftState): String;
implementation
uses
GFXInterface; { Just to get FPC to compile the TGfxCanvas descendants }
{ Exceptions }
constructor EGfxUnsupportedPixelFormat.Create(const
APixelFormat: TGfxPixelFormat);
begin
inherited CreateFmt(SUnsupportedPixelFormat,
[FormatTypeBPPTable[APixelFormat.FormatType]]);
end;
{ TFCustomFont }
class function TFCustomFont.GetDefaultFontName(const AFontClass: TGfxFontClass): String;
const
FontNames: array[TGfxFontClass] of String = (
'times', 'helvetica', 'courier', 'dingbats');
begin
Result := FontNames[AFontClass];
end;
{ TGfxPalette }
destructor TGfxPalette.Destroy;
begin
if Assigned(FEntries) then
FreeMem(FEntries);
inherited Destroy;
end;
procedure TGfxPalette.AddRef;
begin
Inc(FRefCount);
end;
procedure TGfxPalette.Release;
begin
if FRefCount <= 0 then
Free
else
Dec(FRefCount);
end;
constructor TGfxPalette.Create(AEntryCount: Integer; AEntries: PGfxColor);
begin
inherited Create;
FEntryCount := AEntryCount;
GetMem(FEntries, EntryCount * SizeOf(TGfxColor));
if Assigned(AEntries) then
Move(AEntries^, FEntries^, EntryCount * SizeOf(TGfxColor));
end;
function TGfxPalette.GetEntry(AIndex: Integer): TGfxColor;
begin
if (AIndex >= 0) and (AIndex < EntryCount) then
Result := FEntries[AIndex]
else
Result := colBlack;
end;
{ TFCustomCanvas }
constructor TFCustomCanvas.Create;
begin
inherited Create;
Matrix := GfxIdentityMatrix;
end;
function TFCustomCanvas.Transform(APoint: TPoint): TPoint;
begin
Result.x := Matrix._00 * APoint.x + Matrix._20;
Result.y := Matrix._11 * APoint.y + Matrix._21;
end;
function TFCustomCanvas.Transform(ARect: TRect): TRect;
begin
Result.Left := Matrix._00 * ARect.Left + Matrix._20;
Result.Top := Matrix._11 * ARect.Top + Matrix._21;
Result.Right := Matrix._00 * ARect.Right + Matrix._20;
Result.Bottom := Matrix._11 * ARect.Bottom + Matrix._21;
end;
function TFCustomCanvas.ReverseTransform(APoint: TPoint): TPoint;
begin
Result.x := (APoint.x - Matrix._20) div Matrix._00;
Result.y := (APoint.y - Matrix._21) div Matrix._11;
end;
function TFCustomCanvas.ReverseTransform(ARect: TRect): TRect;
begin
Result.Left := (ARect.Left - Matrix._20) div Matrix._00;
Result.Top := (ARect.Top - Matrix._21) div Matrix._11;
Result.Right := (ARect.Right - Matrix._20) div Matrix._00;
Result.Bottom := (ARect.Bottom - Matrix._21) div Matrix._11;
end;
procedure TFCustomCanvas.AppendTranslation(ADelta: TPoint);
begin
// Append a translation to the existing transformation matrix
Inc(FMatrix._20, FMatrix._00 * ADelta.x);
Inc(FMatrix._21, FMatrix._11 * ADelta.y);
end;
procedure TFCustomCanvas.EmptyClipRect;
begin
IntersectClipRect(Rect(0, 0, 0, 0));
end;
function TFCustomCanvas.ExcludeClipRect(const ARect: TRect): Boolean;
var
Rect: TRect;
begin
Rect := Transform(ARect);
if (Rect.Right > Rect.Left) and (Rect.Bottom > Rect.Top) then
Result := DoExcludeClipRect(Rect)
else
Result := False;
end;
function TFCustomCanvas.IntersectClipRect(const ARect: TRect): Boolean;
var
Rect: TRect;
begin
Rect := Transform(ARect);
if (Rect.Right > Rect.Left) and (Rect.Bottom > Rect.Top) then
Result := DoIntersectClipRect(Rect)
else
Result := False;
end;
function TFCustomCanvas.UnionClipRect(const ARect: TRect): Boolean;
var
Rect: TRect;
begin
Rect := Transform(ARect);
if (Rect.Right > Rect.Left) and (Rect.Bottom > Rect.Top) then
Result := DoUnionClipRect(Rect)
else
with GetClipRect do
Result := (Right > Left) and (Bottom > Top);
end;
function TFCustomCanvas.GetClipRect: TRect;
begin
Result := ReverseTransform(DoGetClipRect);
end;
procedure TFCustomCanvas.SetColor(AColor: TGfxColor);
begin
SetColor_(MapColor(AColor));
end;
procedure TFCustomCanvas.DrawArc(const ARect: TRect; StartAngle, EndAngle: Single);
begin
DoDrawArc(Transform(ARect), StartAngle, EndAngle);
end;
procedure TFCustomCanvas.DrawCircle(const ARect: TRect);
begin
DoDrawCircle(Transform(ARect));
end;
procedure TFCustomCanvas.DrawLine(const AFrom, ATo: TPoint);
begin
DoDrawLine(Transform(AFrom), Transform(ATo));
end;
procedure TFCustomCanvas.DrawPolyLine(const Coords: array of TPoint);
var
i: Integer;
begin
for i := Low(Coords) to High(Coords) do
DrawLine(Coords[i], Coords[i + 1]);
end;
procedure TFCustomCanvas.DoDrawRect(const ARect: TRect);
begin
{ DrawPolyLine(
[ARect.TopLeft,
Point(ARect.Right - 1, ARect.Top),
Point(ARect.Right - 1, ARect.Bottom - 1),
Point(ARect.Left, ARect.Bottom - 1),
ARect.TopLeft]);}
DoDrawLine(ARect.TopLeft, Point(ARect.Right - 1, ARect.Top));
DoDrawLine(Point(ARect.Right - 1, ARect.Top), Point(ARect.Right - 1, ARect.Bottom - 1));
DoDrawLine(Point(ARect.Right - 1, ARect.Bottom - 1), Point(ARect.Left, ARect.Bottom - 1));
DoDrawLine(Point(ARect.Left, ARect.Bottom - 1), ARect.TopLeft);
end;
procedure TFCustomCanvas.DrawRect(const ARect: TRect);
var
r: TRect;
begin
r := Transform(ARect);
if (r.Right > r.Left) and (r.Bottom > r.Top) then
DoDrawRect(r);
end;
procedure TFCustomCanvas.DrawPoint(const APoint: TPoint);
begin
DoDrawPoint(Transform(APoint));
end;
procedure TFCustomCanvas.FillRect(const ARect: TRect);
var
r: TRect;
begin
r := Transform(ARect);
if (r.Right > r.Left) and (r.Bottom > r.Top) then
DoFillRect(r);
end;
function TFCustomCanvas.TextExtent(const AText: String): TSize;
begin
Result.cx := TextWidth(AText);
Result.cy := FontCellHeight;
end;
function TFCustomCanvas.TextWidth(const AText: String): Integer;
begin
Result := TextExtent(AText).cx;
end;
procedure TFCustomCanvas.TextOut(const APosition: TPoint; const AText: String);
begin
DoTextOut(Transform(APosition), AText);
end;
procedure TFCustomCanvas.Copy(ASource: TFCustomCanvas; const ADestPos: TPoint);
begin
ASSERT(Assigned(ASource));
CopyRect(ASource, Rect(0, 0, ASource.Width, ASource.Height), ADestPos);
end;
procedure TFCustomCanvas.CopyRect(ASource: TFCustomCanvas; const ASourceRect: TRect;
const ADestPos: TPoint);
var
SourceRect: TRect;
begin
SourceRect := ASource.Transform(ASourceRect);
with SourceRect do
if (Left >= Right) or (Top >= Bottom) then
exit;
DoCopyRect(ASource, SourceRect, Transform(ADestPos));
end;
procedure TFCustomCanvas.MaskedCopy(ASource, AMask: TFCustomCanvas;
const ADestPos: TPoint);
begin
MaskedCopyRect(ASource, AMask, Rect(0, 0, ASource.Width, ASource.Height),
Point(0, 0), ADestPos);
end;
procedure TFCustomCanvas.MaskedCopyRect(ASource, AMask: TFCustomCanvas;
const ASourceRect: TRect; const AMaskPos, ADestPos: TPoint);
begin
DoMaskedCopyRect(ASource, AMask, ASource.Transform(ASourceRect),
AMask.Transform(AMaskPos), Transform(ADestPos));
end;
procedure TFCustomCanvas.DrawImage(AImage: TFCustomImage; const ADestPos: TPoint);
begin
DrawImageRect(AImage, Rect(0, 0, AImage.Width, AImage.Height), ADestPos);
end;
procedure TFCustomCanvas.DrawImageRect(AImage: TFCustomImage; ASourceRect: TRect;
const ADestPos: TPoint);
var
SourceRect: TRect;
begin
SourceRect := ASourceRect;
{ if SourceRect.Right > Width then
SourceRect.Right := Width;
if SourceRect.Bottom > Height then
SourceRect.Bottom := Height;}
if (SourceRect.Right > SourceRect.Left) and
(SourceRect.Bottom > SourceRect.Top) then
DoDrawImageRect(AImage, ASourceRect, Transform(ADestPos));
end;
{ TFCustomImage }
destructor TFCustomImage.Destroy;
begin
if Assigned(Palette) then
Palette.Release;
inherited Destroy;
end;
procedure TFCustomImage.Unlock;
begin
// Default implementation: Do nothing...
end;
procedure TFCustomImage.SetPixelsFromData(AData: Pointer; AStride: LongWord);
var
DestData: Pointer;
DestStride, BytesPerScanline: LongWord;
y: Integer;
begin
DestStride := 0; // to remove compiler warning
DestData := nil;
if Height <= 0 then
exit;
Lock(DestData, DestStride);
try
if DestStride = AStride then
Move(AData^, DestData^, AStride * Height)
else
begin
if DestStride > AStride then
BytesPerScanline := AStride
else
BytesPerScanline := DestStride;
y := 0;
while True do
begin
Move(AData^, DestData^, BytesPerScanline);
Inc(y);
if y = Height then
break;
Inc(AData, AStride);
Inc(DestData, DestStride);
end;
end;
finally
Unlock;
end;
end;
constructor TFCustomImage.Create(AWidth, AHeight: Integer;
APixelFormat: TGfxPixelFormat);
begin
FWidth := AWidth;
FHeight := AHeight;
FPixelFormat := APixelFormat;
end;
procedure TFCustomImage.SetPalette(APalette: TGfxPalette);
begin
if APalette <> Palette then
begin
if Assigned(Palette) then
Palette.Release;
FPalette := APalette;
if Assigned(Palette) then
Palette.AddRef;
end;
end;
{ TFCustomScreen }
constructor TFCustomScreen.Create;
begin
inherited Create;
end;
{ TFCustomWindow }
function TFCustomWindow.CanClose: Boolean;
begin
if Assigned(OnCanClose) then
Result := OnCanClose(Self)
else
Result := True;
end;
procedure TFCustomWindow.SetPosition(const APosition: TPoint);
begin
// Empty
end;
procedure TFCustomWindow.SetSize(const ASize: TSize);
begin
// Empty
end;
procedure TFCustomWindow.SetMinMaxSize(const AMinSize, AMaxSize: TSize);
begin
// Empty
end;
procedure TFCustomWindow.SetFixedSize(const ASize: TSize);
begin
SetMinMaxSize(ASize, ASize);
SetSize(ASize);
end;
procedure TFCustomWindow.SetClientSize(const ASize: TSize);
begin
// Empty
end;
procedure TFCustomWindow.SetMinMaxClientSize(const AMinSize, AMaxSize: TSize);
begin
// Empty
end;
procedure TFCustomWindow.SetFixedClientSize(const ASize: TSize);
begin
SetMinMaxClientSize(ASize, ASize);
SetClientSize(ASize);
end;
function TFCustomWindow.GetTitle: String;
begin
SetLength(Result, 0);
end;
procedure TFCustomWindow.SetTitle(const ATitle: String);
begin
// Empty
end;
procedure TFCustomWindow.SetWidth(AWidth: Integer);
begin
SetSize(Size(AWidth, Height));
end;
procedure TFCustomWindow.SetHeight(AHeight: Integer);
begin
SetSize(Size(Width, AHeight));
end;
procedure TFCustomWindow.SetCursor(ACursor: TGfxCursor);
begin
if ACursor <> Cursor then
begin
FCursor := ACursor;
DoSetCursor;
end;
end;
procedure TFCustomWindow.SetWindowOptions(const AValue: TGfxWindowOptions);
begin
if FWindowOptions=AValue then exit;
FWindowOptions:=AValue;
end;
// ===================================================================
// Global functions
// ===================================================================
// Sizes, points etc.
function Size(AWidth, AHeight: Integer): TSize;
begin
Result.cx := AWidth;
Result.cy := AHeight;
end;
function Size(ARect: TRect): TSize;
begin
Result.cx := ARect.Right - ARect.Left;
Result.cy := ARect.Bottom - ARect.Top;
end;
function PtInRect(const ARect: TRect; const APoint: TPoint): Boolean;
begin
with ARect, APoint do
Result := (x >= Left) and (y >= Top) and (x < Right) and (y < Bottom);
end;
{$ifdef fpc}
operator = (const ASize1, ASize2: TSize) b: Boolean;
begin
b := (ASize1.cx = ASize2.cx) and (ASize1.cy = ASize2.cy);
end;
operator + (const APoint1, APoint2: TPoint) p: TPoint;
begin
p.x := APoint1.x + APoint2.x;
p.y := APoint1.y + APoint2.y;
end;
operator + (const APoint: TPoint; ASize: TSize) p: TPoint;
begin
p.x := APoint.x + ASize.cx;
p.y := APoint.y + ASize.cy;
end;
operator + (const ASize: TSize; APoint: TPoint) s: TSize;
begin
s.cx := ASize.cx + APoint.x;
s.cy := ASize.cy + APoint.y;
end;
operator + (const ASize1, ASize2: TSize) s: TSize;
begin
s.cx := ASize1.cx + ASize2.cx;
s.cy := ASize1.cy + ASize2.cy;
end;
operator + (const APoint: TPoint; i: Integer) p: TPoint;
begin
p.x := APoint.x + i;
p.y := APoint.y + i;
end;
operator + (const ASize: TSize; i: Integer) s: TSize;
begin
s.cx := ASize.cx + i;
s.cy := ASize.cy + i;
end;
operator - (const APoint1, APoint2: TPoint) p: TPoint;
begin
p.x := APoint1.x - APoint2.x;
p.y := APoint1.y - APoint2.y;
end;
operator - (const APoint: TPoint; i: Integer) p: TPoint;
begin
p.x := APoint.x - i;
p.y := APoint.y - i;
end;
operator - (const ASize: TSize; const APoint: TPoint) s: TSize;
begin
s.cx := ASize.cx - APoint.x;
s.cy := ASize.cy - APoint.y;
end;
operator - (const ASize: TSize; i: Integer) s: TSize;
begin
s.cx := ASize.cx - i;
s.cy := ASize.cy - i;
end;
// Color functions
operator = (const AColor1, AColor2: TGfxColor) b: Boolean;
begin
b := (AColor1.Red = AColor2.Red) and (AColor1.Green = AColor2.Green) and
(AColor1.Blue = AColor2.Blue) and (AColor1.Alpha = AColor2.Alpha);
end;
{$endif}
function GetAvgColor(const AColor1, AColor2: TGfxColor): TGfxColor;
begin
Result.Red := AColor1.Red + (AColor2.Red - AColor1.Red) div 2;
Result.Green := AColor1.Green + (AColor2.Green - AColor1.Green) div 2;
Result.Blue := AColor1.Blue + (AColor2.Blue - AColor1.Blue) div 2;
Result.Alpha := AColor1.Alpha + (AColor2.Alpha - AColor1.Alpha) div 2;
end;
// Keyboard functions
function KeycodeToText(Key: Word; ShiftState: TShiftState): String;
function GetASCIIText: String;
var
c: Char;
begin
result := '';
c := Chr(Key and $ff);
case c of
#13: Result := Result + 'Enter';
#127: Result := Result + 'Del';
'+': Result := Result + 'Plus'
else
Result := Result + c;
end;
end;
var
s: String;
begin
SetLength(Result, 0);
if ssShift in ShiftState then
Result := 'Shift+';
if ssCtrl in ShiftState then
Result := 'Ctrl+';
if ssAlt in ShiftState then
Result := 'Alt+';
if (Key > Ord(' ')) and (Key < 255) then
begin
Result := Result + GetASCIIText;
exit;
end;
case Key of
keyNul: s := 'Null';
keyBackSpace: s := 'Backspace';
keyTab: s := 'Tab';
keyLinefeed: s := 'Linefeed';
keyReturn: s := 'Enter';
keyEscape: s := 'Esc';
Ord(' '): s := 'Space';
keyDelete: s := 'Del';
keyVoid: s := 'Void';
keyBreak: s := 'Break';
keyScrollForw: s := 'ScrollForw';
keyScrollBack: s := 'ScrollBack';
keyBoot: s := 'Boot';
keyCompose: s := 'Compose';
keySAK: s := 'SAK';
keyUndo: s := 'Undo';
keyRedo: s := 'Redo';
keyMenu: s := 'Menu';
keyCancel: s := 'Cancel';
keyPrintScreen: s := 'PrtScr';
keyExecute: s := 'Exec';
keyFind: s := 'Find';
keyBegin: s := 'Begin';
keyClear: s := 'Clear';
keyInsert: s := 'Ins';
keySelect: s := 'Select';
keyMacro: s := 'Macro';
keyHelp: s := 'Help';
keyDo: s := 'Do';
keyPause: s := 'Pause';
keySysRq: s := 'SysRq';
keyModeSwitch: s := 'ModeSw';
keyUp: s := 'Up';
keyDown: s := 'Down';
keyLeft: s := 'Left';
keyRight: s := 'Right';
keyPrior: s := 'PgUp';
keyNext: s := 'PgDown';
keyHome: s := 'Home';
keyEnd: s := 'End';
keyF0..keyF64: s := 'F' + IntToStr(Key - keyF0);
keyP0..keyP9: s := 'KP' + Chr(Key - keyP0 + Ord('0'));
keyPA..keyPF: s := 'KP' + Chr(Key - keyPA + Ord('A'));
keyPPlus, keyPMinus, keyPSlash, keyPStar, keyPEqual, keyPSeparator,
keyPDecimal, keyPParenLeft, keyPParenRight, keyPSpace, keyPEnter,
keyPTab: s := 'KP' + GetASCIIText;
keyPPlusMinus: s := 'KPPlusMinus';
keyPBegin: s := 'KPBegin';
keyPF1..keyPF9: s := 'KPF' + IntToStr(Key - keyPF1);
keyShiftL: s := 'ShiftL';
keyShiftR: s := 'ShiftR';
keyCtrlL: s := 'CtrlL';
keyCtrlR: s := 'CtrlR';
keyAltL: s := 'AltL';
keyAltR: s := 'AltR';
keyMetaL: s := 'MetaL';
keyMetaR: s := 'MetaR';
keySuperL: s := 'SuperL';
keySuperR: s := 'SuperR';
keyHyperL: s := 'HyperL';
keyHyperR: s := 'HyperR';
keyAltGr: s := 'AltGr';
keyCaps: s := 'Caps';
keyNum: s := 'Num';
keyScroll: s := 'Scroll';
keyShiftLock: s := 'ShiftLock';
keyCtrlLock: s := 'CtrlLock';
keyAltLock: s := 'AltLock';
keyMetaLock: s := 'MetaLock';
keySuperLock: s := 'SuperLock';
keyHyperLock: s := 'HyperLock';
keyAltGrLock: s := 'AltGrLock';
keyCapsLock: s := 'CapsLock';
keyNumLock: s := 'NumLock';
keyScrollLock: s := 'ScrollLock';
keyDeadRing: s := 'DeadRing';
keyDeadCaron: s := 'DeadCaron';
keyDeadOgonek: s := 'DeadOgonek';
keyDeadIota: s := 'DeadIota';
keyDeadDoubleAcute: s := 'DeadDoubleAcute';
keyDeadBreve: s := 'DeadBreve';
keyDeadAboveDot: s := 'DeadAboveDot';
keyDeadBelowDot: s := 'DeadBelowDot';
keyDeadVoicedSound: s := 'DeadVoicedSound';
keyDeadSemiVoicedSound: s := 'DeadSemiVoicedSound';
keyDeadAcute: s := 'DeadAcute';
keyDeadCedilla: s := 'DeadCedilla';
keyDeadCircumflex: s := 'DeadCircumflex';
keyDeadDiaeresis: s := 'DeadDiaeresis';
keyDeadGrave: s := 'DeadGrave';
keyDeadTilde: s := 'DeadTilde';
keyDeadMacron: s := 'DeadMacron';
keyEcuSign: s := 'Ecu';
keyColonSign: s := 'Colon';
keyCruzeiroSign: s := 'Cruzeiro';
keyFFrancSign: s := 'FFranc';
keyLiraSign: s := 'Lira';
keyMillSign: s := 'Mill';
keyNairaSign: s := 'Naira';
keyPesetaSign: s := 'Peseta';
keyRupeeSign: s := 'Rupee';
keyWonSign: s := 'Won';
keyNewSheqelSign: s := 'NewShequel';
keyDongSign: s := 'Dong';
keyEuroSign: s := 'Euro';
else
s := '#' + IntToHex(Key, 4);
end;
Result := Result + s;
end;
{ TFCustomApplication }
constructor TFCustomApplication.Create;
begin
inherited Create(nil);
Forms := TList.Create;
FQuitWhenLastWindowCloses := True;
end;
destructor TFCustomApplication.Destroy;
begin
Forms.Free;
inherited Destroy;
end;
end.
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