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378 lines (324 loc) · 11.2 KB
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{ ***************************************************************************
* *
* This file is part of BGRABitmap library which is distributed under the *
* modified LGPL. *
* *
* See the file COPYING.modifiedLGPL.txt, included in this distribution, *
* for details about the copyright. *
* *
* 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. *
* *
************************* BGRABitmap library ******************************
- Drawing routines with transparency and antialiasing with Lazarus.
Offers also various transforms.
- These routines allow to manipulate 32bit images in BGRA format or RGBA
format (depending on the platform).
- This code is under modified LGPL (see COPYING.modifiedLGPL.txt).
This means that you can link this library inside your programs for any purpose.
Only the included part of the code must remain LGPL.
- If you make some improvements to this library, please notify here:
http://www.lazarus.freepascal.org/index.php/topic,12037.0.html
********************* Contact : Circular at operamail.com *******************
******************************* CONTRIBUTOR(S) ******************************
- Edivando S. Santos Brasil | mailedivando@gmail.com
(Compatibility with FPC ($Mode objfpc/delphi) and delphi VCL 11/2018)
***************************** END CONTRIBUTOR(S) *****************************}
Unit BGRAGtkBitmap;
//This unit should NOT be added to the 'uses' clause.
//It contains patches for Gtk
{$i bgrabitmap.inc}{$H+}
interface
uses
Classes, SysUtils, BGRALCLBitmap, Graphics,
GraphType;
type
{ TBGRAGtkBitmap }
TBGRAGtkBitmap = class(TBGRALCLBitmap)
private
FPixBuf: Pointer;
procedure DrawTransparent(ACanvas: TCanvas; Rect: TRect);
procedure DrawOpaque(ACanvas: TCanvas; ARect: TRect; ASourceRect: TRect);
procedure DrawOpaque(ACanvas: TCanvas; ARect: TRect);
protected
procedure ReallocData; override;
procedure FreeData; override;
public
procedure DataDrawTransparent(ACanvas: TCanvas; Rect: TRect;
AData: Pointer; ALineOrder: TRawImageLineOrder; AWidth, AHeight: integer);
override;
procedure DrawPart(ARect: TRect; ACanvas: TCanvas; x, y: integer; Opaque: boolean); override;
procedure Draw(ACanvas: TCanvas; x, y: integer; Opaque: boolean = True); override;
procedure Draw(ACanvas: TCanvas; Rect: TRect; Opaque: boolean = True); override;
procedure DataDrawOpaque(ACanvas: TCanvas; ARect: TRect; AData: Pointer;
ALineOrder: TRawImageLineOrder; AWidth, AHeight: integer); overload; override;
procedure DataDrawOpaque(ACanvas: TCanvas; ARect: TRect; ADataFirstRow: Pointer;
ARowStride: integer; AWidth, AHeight: integer); overload;
procedure GetImageFromCanvas(CanvasSource: TCanvas; x, y: integer); override;
end;
implementation
uses BGRABitmapTypes, BGRADefaultBitmap, BGRAFilterScanner, LCLType,
LCLIntf, IntfGraphics,
{$IFDEF LCLgtk2}
gdk2, gtk2def, gdk2pixbuf, glib2,
{$ENDIF}
{$IFDEF LCLgtk}
gdk, gtkdef, gtkProc, gdkpixbuf, glib,
{$ENDIF}
FPImage, Dialogs;
{$IFDEF LCLgtk2}
type TGtkDeviceContext = TGtk2DeviceContext;
{$ENDIF}
procedure TBGRAGtkBitmap.ReallocData;
begin
{$IFDEF LCLgtk2}
If FPixBuf <> nil then g_object_unref(FPixBuf);
{$ELSE}
If FPixBuf <> nil then gdk_pixbuf_unref(FPixBuf);
{$ENDIF}
FPixBuf := nil;
inherited ReallocData;
if (FWidth <> 0) and (FHeight <> 0) then
begin
FPixbuf := gdk_pixbuf_new_from_data(pguchar(FData),
GDK_COLORSPACE_RGB, True, 8, Width, Height, Width*Sizeof(TBGRAPixel), nil, nil);
if FPixbuf = nil then
raise Exception.Create('Error initializing Pixbuf');
end;
end;
procedure TBGRAGtkBitmap.FreeData;
begin
{$IFDEF LCLgtk2}
If FPixBuf <> nil then g_object_unref(FPixBuf);
{$ELSE}
If FPixBuf <> nil then gdk_pixbuf_unref(FPixBuf);
{$ENDIF}
FPixBuf := nil;
inherited FreeData;
end;
procedure TBGRAGtkBitmap.DrawTransparent(ACanvas: TCanvas; Rect: TRect);
var DrawWidth,DrawHeight: integer;
stretched: TBGRAGtkBitmap;
P: TPoint;
begin
DrawWidth := Rect.Right-Rect.Left;
DrawHeight := Rect.Bottom-Rect.Top;
if (Height = 0) or (Width = 0) or (DrawWidth <= 0) or (DrawHeight <= 0) then
exit;
if (DrawWidth <> Width) or (DrawHeight <> Height) then
begin
stretched := Resample(DrawWidth,DrawHeight,rmSimpleStretch) as TBGRAGtkBitmap;
stretched.DrawTransparent(ACanvas,Rect);
stretched.Free;
exit;
end;
LoadFromBitmapIfNeeded;
If not TBGRAPixel_RGBAOrder then SwapRedBlue;
P := Rect.TopLeft;
LPToDP(ACanvas.Handle, P, 1);
gdk_pixbuf_render_to_drawable(FPixBuf,
TGtkDeviceContext(ACanvas.Handle).Drawable,
TGtkDeviceContext(ACanvas.Handle).GC,
0,0, P.X,P.Y,
Width,Height,
GDK_RGB_DITHER_NORMAL,0,0);
If not TBGRAPixel_RGBAOrder then SwapRedBlue;
end;
procedure TBGRAGtkBitmap.DrawOpaque(ACanvas: TCanvas; ARect: TRect;
ASourceRect: TRect);
begin
DataDrawOpaque(ACanvas,ARect,Data,LineOrder,Width,Height);
end;
procedure TBGRAGtkBitmap.DrawOpaque(ACanvas: TCanvas; ARect: TRect);
begin
DrawOpaque(ACanvas, ARect, rect(0,0,Width,Height));
end;
procedure TBGRAGtkBitmap.DataDrawTransparent(ACanvas: TCanvas; Rect: TRect;
AData: Pointer; ALineOrder: TRawImageLineOrder; AWidth, AHeight: integer);
var
TempGtk: TBGRAGtkBitmap;
temp: integer;
begin
if (AHeight = 0) or (AWidth = 0) or (Rect.Left = Rect.Right) or
(Rect.Top = Rect.Bottom) then
exit;
if Rect.Right < Rect.Left then
begin
temp := Rect.Left;
Rect.Left := Rect.Right;
Rect.Right := temp;
end;
if Rect.Bottom < Rect.Top then
begin
temp := Rect.Top;
Rect.Top := Rect.Bottom;
Rect.Bottom := temp;
end;
TempGtk := TBGRAGtkBitmap.Create(AWidth, AHeight);
Move(AData^,TempGtk.Data^,TempGtk.NbPixels*sizeof(TBGRAPixel));
if ALineOrder <> TempGtk.LineOrder then TempGtk.VerticalFlip;
TempGtk.DrawTransparent(ACanvas,Rect);
TempGtk.Free;
end;
procedure TBGRAGtkBitmap.DrawPart(ARect: TRect; ACanvas: TCanvas; x,
y: integer; Opaque: boolean);
var
rowStride,w,h: Integer;
begin
if Opaque then
begin
if LineOrder = riloTopToBottom then
rowStride := Width*sizeof(TBGRAPixel)
else
rowStride := -Width*sizeof(TBGRAPixel);
w:= ARect.Right-ARect.Left;
h:= ARect.Bottom-ARect.Top;
DataDrawOpaque(ACanvas, rect(x,y,x+w,y+h), Scanline[ARect.Top]+ARect.Left, rowStride, w,h);
end
else
inherited DrawPart(ARect, ACanvas, x, y, Opaque);
end;
procedure TBGRAGtkBitmap.Draw(ACanvas: TCanvas; x, y: integer; Opaque: boolean);
begin
if self = nil then
exit;
if Opaque then
DrawOpaque(ACanvas, Rect(X, Y, X + Width, Y + Height))
else
DrawTransparent(ACanvas, Rect(X, Y, X + Width, Y + Height));
end;
procedure TBGRAGtkBitmap.Draw(ACanvas: TCanvas; Rect: TRect; Opaque: boolean);
begin
if self = nil then
exit;
if Opaque then
DrawOpaque(ACanvas, Rect)
else
DrawTransparent(ACanvas, Rect);
end;
procedure TBGRAGtkBitmap.DataDrawOpaque(ACanvas: TCanvas; ARect: TRect;
AData: Pointer; ALineOrder: TRawImageLineOrder; AWidth, AHeight: integer);
var
rowStride: Integer;
firstRow: Pointer;
begin
if ALineOrder = riloTopToBottom then
begin
rowStride := AWidth*sizeof(TBGRAPixel);
firstRow := AData;
end
else
begin
rowStride := -AWidth*sizeof(TBGRAPixel);
firstRow := PBGRAPixel(AData) + (AWidth*(AHeight-1));
end;
DataDrawOpaque(ACanvas, ARect, firstRow, rowStride, AWidth, AHeight);
end;
procedure TBGRAGtkBitmap.DataDrawOpaque(ACanvas: TCanvas; ARect: TRect;
ADataFirstRow: Pointer; ARowStride: integer; AWidth, AHeight: integer);
procedure DataSwapRedBlue;
var
y: Integer;
p: PByte;
begin
p := PByte(ADataFirstRow);
for y := 0 to AHeight-1 do
begin
TBGRAFilterScannerSwapRedBlue.ComputeFilterAt(PBGRAPixel(p),PBGRAPixel(p),AWidth,False);
inc(p, ARowStride);
end;
end;
procedure DrawStretched;
var
dataStart: Pointer;
ptr: TBGRAPtrBitmap;
stretched: TBGRACustomBitmap;
begin
if ARowStride < 0 then
dataStart := PByte(ADataFirstRow) + ARowStride*(Height-1)
else
dataStart := ADataFirstRow;
if ARowStride <> abs(AWidth*sizeof(TBGRAPixel)) then
raise exception.Create('DataDrawOpaque not supported when using custom row stride and resample');
ptr := TBGRAPtrBitmap.Create(AWidth,AHeight,dataStart);
if ARowStride < 0 then
ptr.LineOrder := riloBottomToTop
else
ptr.LineOrder := riloTopToBottom;
stretched := ptr.Resample(ARect.Right-ARect.Left,ARect.Bottom-ARect.Top);
ptr.free;
DataDrawOpaque(ACanvas,ARect,dataStart,stretched.LineOrder,stretched.Width,stretched.Height);
stretched.Free;
end;
var
temp: integer;
pos: TPoint;
dest: HDC;
begin
if (AHeight = 0) or (AWidth = 0) or (ARect.Left = ARect.Right) or
(ARect.Top = ARect.Bottom) then exit;
if ARect.Right < ARect.Left then
begin
temp := ARect.Left;
ARect.Left := ARect.Right;
ARect.Right := temp;
end;
if ARect.Bottom < ARect.Top then
begin
temp := ARect.Top;
ARect.Top := ARect.Bottom;
ARect.Bottom := temp;
end;
if (AWidth <> ARect.Right-ARect.Left) or (AHeight <> ARect.Bottom-ARect.Top) then
DrawStretched
else
begin
dest := ACanvas.Handle;
pos := ARect.TopLeft;
LPtoDP(dest, pos, 1);
if not TBGRAPixel_RGBAOrder then DataSwapRedBlue;
gdk_draw_rgb_32_image(TGtkDeviceContext(dest).Drawable,
TGtkDeviceContext(Dest).GC, pos.x,pos.y,
AWidth,AHeight, GDK_RGB_DITHER_NORMAL,
ADataFirstRow, ARowStride);
if not TBGRAPixel_RGBAOrder then DataSwapRedBlue;
end;
end;
procedure TBGRAGtkBitmap.GetImageFromCanvas(CanvasSource: TCanvas; x, y: integer);
var
subBmp: TBGRACustomBitmap;
subRect: TRect;
cw,ch: integer;
P: TPoint;
begin
cw := CanvasSource.Width;
ch := CanvasSource.Height;
if (x < 0) or (y < 0) or (x+Width > cw) or
(y+Height > ch) then
begin
FillTransparent;
if (x+Width <= 0) or (y+Height <= 0) or
(x >= cw) or (y >= ch) then
exit;
if (x > 0) then subRect.Left := x else subRect.Left := 0;
if (y > 0) then subRect.Top := y else subRect.Top := 0;
if (x+Width > cw) then subRect.Right := cw else
subRect.Right := x+Width;
if (y+Height > ch) then subRect.Bottom := ch else
subRect.Bottom := y+Height;
subBmp := NewBitmap(subRect.Right-subRect.Left,subRect.Bottom-subRect.Top);
subBmp.GetImageFromCanvas(CanvasSource,subRect.Left,subRect.Top);
PutImage(subRect.Left-x,subRect.Top-y,subBmp,dmSet);
subBmp.Free;
exit;
end;
P := Point(x,y);
LPToDP(CanvasSource.Handle, P, 1);
gdk_pixbuf_get_from_drawable(FPixBuf,
TGtkDeviceContext(CanvasSource.Handle).Drawable,
nil, P.X,P.Y,0,0,Width,Height);
If not TBGRAPixel_RGBAOrder then SwapRedBlue;
InvalidateBitmap;
end;
end.
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