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-rw-r--r--src/base/UImage.pas993
1 files changed, 993 insertions, 0 deletions
diff --git a/src/base/UImage.pas b/src/base/UImage.pas
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index 00000000..d33c0d38
--- /dev/null
+++ b/src/base/UImage.pas
@@ -0,0 +1,993 @@
+unit UImage;
+
+interface
+
+{$IFDEF FPC}
+ {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+ SDL;
+
+{$DEFINE HavePNG}
+{$DEFINE HaveBMP}
+{$DEFINE HaveJPG}
+
+const
+ PixelFmt_RGBA: TSDL_Pixelformat = (
+ palette: nil;
+ BitsPerPixel: 32;
+ BytesPerPixel: 4;
+ Rloss: 0;
+ Gloss: 0;
+ Bloss: 0;
+ Aloss: 0;
+ Rshift: 0;
+ Gshift: 8;
+ Bshift: 16;
+ Ashift: 24;
+ Rmask: $000000ff;
+ Gmask: $0000ff00;
+ Bmask: $00ff0000;
+ Amask: $ff000000;
+ ColorKey: 0;
+ Alpha: 255
+ );
+
+ PixelFmt_RGB: TSDL_Pixelformat = (
+ palette: nil;
+ BitsPerPixel: 24;
+ BytesPerPixel: 3;
+ Rloss: 0;
+ Gloss: 0;
+ Bloss: 0;
+ Aloss: 0;
+ Rshift: 0;
+ Gshift: 8;
+ Bshift: 16;
+ Ashift: 0;
+ Rmask: $000000ff;
+ Gmask: $0000ff00;
+ Bmask: $00ff0000;
+ Amask: $00000000;
+ ColorKey: 0;
+ Alpha: 255
+ );
+
+ PixelFmt_BGRA: TSDL_Pixelformat = (
+ palette: nil;
+ BitsPerPixel: 32;
+ BytesPerPixel: 4;
+ Rloss: 0;
+ Gloss: 0;
+ Bloss: 0;
+ Aloss: 0;
+ Rshift: 16;
+ Gshift: 8;
+ Bshift: 0;
+ Ashift: 24;
+ Rmask: $00ff0000;
+ Gmask: $0000ff00;
+ Bmask: $000000ff;
+ Amask: $ff000000;
+ ColorKey: 0;
+ Alpha: 255
+ );
+
+ PixelFmt_BGR: TSDL_Pixelformat = (
+ palette: nil;
+ BitsPerPixel: 24;
+ BytesPerPixel: 3;
+ Rloss: 0;
+ Gloss: 0;
+ Bloss: 0;
+ Aloss: 0;
+ Rshift: 16;
+ Gshift: 8;
+ Bshift: 0;
+ Ashift: 0;
+ Rmask: $00ff0000;
+ Gmask: $0000ff00;
+ Bmask: $000000ff;
+ Amask: $00000000;
+ ColorKey: 0;
+ Alpha: 255
+ );
+
+type
+ TImagePixelFmt = (
+ ipfRGBA, ipfRGB, ipfBGRA, ipfBGR
+ );
+
+(*******************************************************
+ * Image saving
+ *******************************************************)
+
+{$IFDEF HavePNG}
+function WritePNGImage(const FileName: string; Surface: PSDL_Surface): boolean;
+{$ENDIF}
+{$IFDEF HaveBMP}
+function WriteBMPImage(const FileName: string; Surface: PSDL_Surface): boolean;
+{$ENDIF}
+{$IFDEF HaveJPG}
+function WriteJPGImage(const FileName: string; Surface: PSDL_Surface; Quality: integer): boolean;
+{$ENDIF}
+
+(*******************************************************
+ * Image loading
+ *******************************************************)
+
+function LoadImage(const Identifier: string): PSDL_Surface;
+
+(*******************************************************
+ * Image manipulation
+ *******************************************************)
+
+function PixelFormatEquals(fmt1, fmt2: PSDL_PixelFormat): boolean;
+procedure ScaleImage(var ImgSurface: PSDL_Surface; Width, Height: Cardinal);
+procedure FitImage(var ImgSurface: PSDL_Surface; Width, Height: Cardinal);
+procedure ColorizeImage(ImgSurface: PSDL_Surface; NewColor: Cardinal);
+
+
+implementation
+
+uses
+ SysUtils,
+ Classes,
+ Math,
+ {$IFDEF MSWINDOWS}
+ Windows,
+ {$ENDIF}
+ {$IFDEF HaveJPG}
+ {$IFDEF Delphi}
+ Graphics,
+ jpeg,
+ {$ELSE}
+ jpeglib,
+ jerror,
+ jcparam,
+ jdatadst, jcapimin, jcapistd,
+ {$ENDIF}
+ {$ENDIF}
+ {$IFDEF HavePNG}
+ png,
+ {$ENDIF}
+ zlib,
+ sdl_image,
+ sdlutils,
+ UCommon,
+ ULog;
+
+
+function IsRGBSurface(pixelFmt: PSDL_PixelFormat): boolean;
+begin
+ Result := (pixelFmt.BitsPerPixel = 24) and
+ (pixelFmt.RMask = $0000FF) and
+ (pixelFmt.GMask = $00FF00) and
+ (pixelFmt.BMask = $FF0000);
+end;
+
+function IsRGBASurface(pixelFmt: PSDL_PixelFormat): boolean;
+begin
+ Result := (pixelFmt.BitsPerPixel = 32) and
+ (pixelFmt.RMask = $000000FF) and
+ (pixelFmt.GMask = $0000FF00) and
+ (pixelFmt.BMask = $00FF0000) and
+ (pixelFmt.AMask = $FF000000);
+end;
+
+function IsBGRSurface(pixelFmt: PSDL_PixelFormat): boolean;
+begin
+ Result := (pixelFmt.BitsPerPixel = 24) and
+ (pixelFmt.BMask = $0000FF) and
+ (pixelFmt.GMask = $00FF00) and
+ (pixelFmt.RMask = $FF0000);
+end;
+
+function IsBGRASurface(pixelFmt: PSDL_PixelFormat): boolean;
+begin
+ Result := (pixelFmt.BitsPerPixel = 32) and
+ (pixelFmt.BMask = $000000FF) and
+ (pixelFmt.GMask = $0000FF00) and
+ (pixelFmt.RMask = $00FF0000) and
+ (pixelFmt.AMask = $FF000000);
+end;
+
+// Converts alpha-formats to BGRA, non-alpha to BGR, and leaves BGR(A) as is
+// sets converted to true if the surface needed to be converted
+function ConvertToBGR_BGRASurface(Surface: PSDL_Surface; out Converted: boolean): PSDL_Surface;
+var
+ pixelFmt: PSDL_PixelFormat;
+begin
+ pixelFmt := Surface.format;
+ if (IsBGRSurface(pixelFmt) or IsBGRASurface(pixelFmt)) then
+ begin
+ Converted := false;
+ Result := Surface;
+ end
+ else
+ begin
+ // invalid format -> needs conversion
+ if (pixelFmt.AMask <> 0) then
+ Result := SDL_ConvertSurface(Surface, @PixelFmt_BGRA, SDL_SWSURFACE)
+ else
+ Result := SDL_ConvertSurface(Surface, @PixelFmt_BGR, SDL_SWSURFACE);
+ Converted := true;
+ end;
+end;
+
+// Converts alpha-formats to RGBA, non-alpha to RGB, and leaves RGB(A) as is
+// sets converted to true if the surface needed to be converted
+function ConvertToRGB_RGBASurface(Surface: PSDL_Surface; out Converted: boolean): PSDL_Surface;
+var
+ pixelFmt: PSDL_PixelFormat;
+begin
+ pixelFmt := Surface.format;
+ if (IsRGBSurface(pixelFmt) or IsRGBASurface(pixelFmt)) then
+ begin
+ Converted := false;
+ Result := Surface;
+ end
+ else
+ begin
+ // invalid format -> needs conversion
+ if (pixelFmt.AMask <> 0) then
+ Result := SDL_ConvertSurface(Surface, @PixelFmt_RGBA, SDL_SWSURFACE)
+ else
+ Result := SDL_ConvertSurface(Surface, @PixelFmt_RGB, SDL_SWSURFACE);
+ Converted := true;
+ end;
+end;
+
+
+(*******************************************************
+ * Image saving
+ *******************************************************)
+
+(***************************
+ * PNG section
+ *****************************)
+
+{$IFDEF HavePNG}
+
+// delphi does not support setjmp()/longjmp() -> define our own error-handler
+procedure user_error_fn(png_ptr: png_structp; error_msg: png_const_charp); cdecl;
+begin
+ raise Exception.Create(error_msg);
+end;
+
+procedure user_read_data(png_ptr: png_structp; data: png_bytep; length: png_size_t); cdecl;
+var
+ inFile: TFileStream;
+begin
+ inFile := TFileStream(png_get_io_ptr(png_ptr));
+ inFile.Read(data^, length);
+end;
+
+procedure user_write_data(png_ptr: png_structp; data: png_bytep; length: png_size_t); cdecl;
+var
+ outFile: TFileStream;
+begin
+ outFile := TFileStream(png_get_io_ptr(png_ptr));
+ outFile.Write(data^, length);
+end;
+
+procedure user_flush_data(png_ptr: png_structp); cdecl;
+//var
+// outFile: TFileStream;
+begin
+ // binary files are flushed automatically, Flush() works with Text-files only
+ //outFile := TFileStream(png_get_io_ptr(png_ptr));
+ //outFile.Flush();
+end;
+
+procedure DateTimeToPngTime(time: TDateTime; var pngTime: png_time);
+var
+ year, month, day: word;
+ hour, minute, second, msecond: word;
+begin
+ DecodeDate(time, year, month, day);
+ pngTime.year := year;
+ pngTime.month := month;
+ pngTime.day := day;
+ DecodeTime(time, hour, minute, second, msecond);
+ pngTime.hour := hour;
+ pngTime.minute := minute;
+ pngTime.second := second;
+end;
+
+(*
+ * ImageData must be in RGB-format
+ *)
+function WritePNGImage(const FileName: string; Surface: PSDL_Surface): boolean;
+var
+ png_ptr: png_structp;
+ info_ptr: png_infop;
+ pngFile: TFileStream;
+ row: integer;
+ rowData: array of png_bytep;
+// rowStride: integer;
+ converted: boolean;
+ colorType: integer;
+// time: png_time;
+begin
+ Result := false;
+
+ // open file for writing
+ try
+ pngFile := TFileStream.Create(FileName, fmCreate);
+ except
+ Log.LogError('Could not open file: "' + FileName + '"', 'WritePngImage');
+ Exit;
+ end;
+
+ // only 24bit (RGB) or 32bit (RGBA) data is supported, so convert to it
+ Surface := ConvertToRGB_RGBASurface(Surface, converted);
+
+ png_ptr := nil;
+
+ try
+ // initialize png (and enable a user-defined error-handler that throws an exception on error)
+ png_ptr := png_create_write_struct(PNG_LIBPNG_VER_STRING, nil, @user_error_fn, nil);
+ // the error-handler is called if png_create_write_struct() fails, so png_ptr should always be <> nil
+ if (png_ptr = nil) then
+ begin
+ Log.LogError('png_create_write_struct() failed', 'WritePngImage');
+ if (converted) then
+ SDL_FreeSurface(Surface);
+ Exit;
+ end;
+
+ info_ptr := png_create_info_struct(png_ptr);
+
+ if (Surface^.format^.BitsPerPixel = 24) then
+ colorType := PNG_COLOR_TYPE_RGB
+ else
+ colorType := PNG_COLOR_TYPE_RGBA;
+
+ // define write IO-functions (POSIX-style FILE-pointers are not available in Delphi)
+ png_set_write_fn(png_ptr, pngFile, @user_write_data, @user_flush_data);
+ png_set_IHDR(
+ png_ptr, info_ptr,
+ Surface.w, Surface.h,
+ 8,
+ colorType,
+ PNG_INTERLACE_NONE,
+ PNG_COMPRESSION_TYPE_DEFAULT,
+ PNG_FILTER_TYPE_DEFAULT
+ );
+
+ // TODO: do we need the modification time?
+ //DateTimeToPngTime(Now, time);
+ //png_set_tIME(png_ptr, info_ptr, @time);
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_LockSurface(Surface);
+
+ // setup data
+ SetLength(rowData, Surface.h);
+ for row := 0 to Surface.h-1 do
+ begin
+ // set rowData-elements to beginning of each image row
+ // Note: the byte-count of a row is pitch (which is not width*bitsPerPixel if the image is aligned)
+ rowData[row] := @PChar(Surface.pixels)[(Surface.h-row-1) * Surface.pitch];
+ end;
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_UnlockSurface(Surface);
+
+ png_write_info(png_ptr, info_ptr);
+ png_write_image(png_ptr, png_bytepp(rowData));
+ png_write_end(png_ptr, nil);
+
+ Result := true;
+ except on E: Exception do
+ Log.LogError(E.message, 'WritePngImage');
+ end;
+
+ // free row-data
+ SetLength(rowData, 0);
+
+ // free png-resources
+ if (png_ptr <> nil) then
+ png_destroy_write_struct(@png_ptr, nil);
+
+ if (converted) then
+ SDL_FreeSurface(Surface);
+
+ // close file
+ pngFile.Free;
+end;
+
+{$ENDIF}
+
+(***************************
+ * BMP section
+ *****************************)
+
+{$IFDEF HaveBMP}
+
+{$IFNDEF MSWINDOWS}
+const
+ (* constants for the biCompression field *)
+ BI_RGB = 0;
+ BI_RLE8 = 1;
+ BI_RLE4 = 2;
+ BI_BITFIELDS = 3;
+ BI_JPEG = 4;
+ BI_PNG = 5;
+
+type
+ BITMAPINFOHEADER = record
+ biSize: longword;
+ biWidth: longint;
+ biHeight: longint;
+ biPlanes: word;
+ biBitCount: word;
+ biCompression: longword;
+ biSizeImage: longword;
+ biXPelsPerMeter: longint;
+ biYPelsPerMeter: longint;
+ biClrUsed: longword;
+ biClrImportant: longword;
+ end;
+ LPBITMAPINFOHEADER = ^BITMAPINFOHEADER;
+ TBITMAPINFOHEADER = BITMAPINFOHEADER;
+ PBITMAPINFOHEADER = ^BITMAPINFOHEADER;
+
+ RGBTRIPLE = record
+ rgbtBlue: byte;
+ rgbtGreen: byte;
+ rgbtRed: byte;
+ end;
+ tagRGBTRIPLE = RGBTRIPLE;
+ TRGBTRIPLE = RGBTRIPLE;
+ PRGBTRIPLE = ^RGBTRIPLE;
+
+ RGBQUAD = record
+ rgbBlue: byte;
+ rgbGreen: byte;
+ rgbRed: byte;
+ rgbReserved: byte;
+ end;
+ tagRGBQUAD = RGBQUAD;
+ TRGBQUAD = RGBQUAD;
+ PRGBQUAD = ^RGBQUAD;
+
+ BITMAPINFO = record
+ bmiHeader: BITMAPINFOHEADER;
+ bmiColors: array[0..0] of RGBQUAD;
+ end;
+ LPBITMAPINFO = ^BITMAPINFO;
+ PBITMAPINFO = ^BITMAPINFO;
+ TBITMAPINFO = BITMAPINFO;
+
+ {$PACKRECORDS 2}
+ BITMAPFILEHEADER = record
+ bfType: word;
+ bfSize: longword;
+ bfReserved1: word;
+ bfReserved2: word;
+ bfOffBits: longword;
+ end;
+ {$PACKRECORDS DEFAULT}
+{$ENDIF}
+
+(*
+ * ImageData must be in BGR-format
+ *)
+function WriteBMPImage(const FileName: string; Surface: PSDL_Surface): boolean;
+var
+ bmpFile: TFileStream;
+ FileInfo: BITMAPINFOHEADER;
+ FileHeader: BITMAPFILEHEADER;
+ Converted: boolean;
+ Row: integer;
+ RowSize: integer;
+begin
+ Result := false;
+
+ // open file for writing
+ try
+ bmpFile := TFileStream.Create(FileName, fmCreate);
+ except
+ Log.LogError('Could not open file: "' + FileName + '"', 'WriteBMPImage');
+ Exit;
+ end;
+
+ // only 24bit (BGR) or 32bit (BGRA) data is supported, so convert to it
+ Surface := ConvertToBGR_BGRASurface(Surface, Converted);
+
+ // aligned (4-byte) row-size in bytes
+ RowSize := ((Surface.w * Surface.format.BytesPerPixel + 3) div 4) * 4;
+
+ // initialize bitmap info
+ FillChar(FileInfo, SizeOf(BITMAPINFOHEADER), 0);
+ with FileInfo do
+ begin
+ biSize := SizeOf(BITMAPINFOHEADER);
+ biWidth := Surface.w;
+ biHeight := Surface.h;
+ biPlanes := 1;
+ biBitCount := Surface^.format^.BitsPerPixel;
+ biCompression := BI_RGB;
+ biSizeImage := RowSize * Surface.h;
+ end;
+
+ // initialize header-data
+ FillChar(FileHeader, SizeOf(BITMAPFILEHEADER), 0);
+ with FileHeader do
+ begin
+ bfType := $4D42; // = 'BM'
+ bfOffBits := SizeOf(BITMAPFILEHEADER) + SizeOf(BITMAPINFOHEADER);
+ bfSize := bfOffBits + FileInfo.biSizeImage;
+ end;
+
+ // and move the whole stuff into the file ;-)
+ try
+ // write headers
+ bmpFile.Write(FileHeader, SizeOf(BITMAPFILEHEADER));
+ bmpFile.Write(FileInfo, SizeOf(BITMAPINFOHEADER));
+
+ // write image-data
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_LockSurface(Surface);
+
+ // BMP needs 4-byte alignment
+ if (Surface.pitch mod 4 = 0) then
+ begin
+ // aligned correctly -> write whole image at once
+ bmpFile.Write(Surface.pixels^, FileInfo.biSizeImage);
+ end
+ else
+ begin
+ // misaligned -> write each line separately
+ // Note: for the last line unassigned memory (> last Surface.pixels element)
+ // will be copied to the padding area (last bytes of a row),
+ // but we do not care because the content of padding data is ignored anyhow.
+ for Row := 0 to Surface.h do
+ bmpFile.Write(PChar(Surface.pixels)[Row * Surface.pitch], RowSize);
+ end;
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_UnlockSurface(Surface);
+
+ Result := true;
+ finally
+ Log.LogError('Could not write file: "' + FileName + '"', 'WriteBMPImage');
+ end;
+
+ if (Converted) then
+ SDL_FreeSurface(Surface);
+
+ // close file
+ bmpFile.Free;
+end;
+
+{$ENDIF}
+
+(***************************
+ * JPG section
+ *****************************)
+
+{$IFDEF HaveJPG}
+
+function WriteJPGImage(const FileName: string; Surface: PSDL_Surface; Quality: integer): boolean;
+var
+ {$IFDEF Delphi}
+ Bitmap: TBitmap;
+ BitmapInfo: TBitmapInfo;
+ Jpeg: TJpegImage;
+ row: integer;
+ {$ELSE}
+ cinfo: jpeg_compress_struct;
+ jerr : jpeg_error_mgr;
+ jpgFile: TFileStream;
+ rowPtr: array[0..0] of JSAMPROW;
+ {$ENDIF}
+ converted: boolean;
+begin
+ Result := false;
+
+ {$IFDEF Delphi}
+ // only 24bit (BGR) data is supported, so convert to it
+ if (IsBGRSurface(Surface.format)) then
+ converted := false
+ else
+ begin
+ Surface := SDL_ConvertSurface(Surface, @PixelFmt_BGR, SDL_SWSURFACE);
+ converted := true;
+ end;
+
+ // create and setup bitmap
+ Bitmap := TBitmap.Create;
+ Bitmap.PixelFormat := pf24bit;
+ Bitmap.Width := Surface.w;
+ Bitmap.Height := Surface.h;
+
+ // setup bitmap info on source image (Surface parameter)
+ ZeroMemory(@BitmapInfo, SizeOf(BitmapInfo));
+ with BitmapInfo.bmiHeader do
+ begin
+ biSize := SizeOf(BITMAPINFOHEADER);
+ biWidth := Surface.w;
+ biHeight := Surface.h;
+ biPlanes := 1;
+ biBitCount := 24;
+ biCompression := BI_RGB;
+ end;
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_LockSurface(Surface);
+
+ // use fast Win32-API functions to copy data instead of Bitmap.Canvas.Pixels
+ if (Surface.pitch mod 4 = 0) then
+ begin
+ // if the image is aligned (to a 4-byte boundary) -> copy all data at once
+ // Note: surfaces created with SDL (e.g. with SDL_ConvertSurface) are aligned
+ SetDIBits(0, Bitmap.Handle, 0, Bitmap.Height, Surface.pixels, BitmapInfo, DIB_RGB_COLORS);
+ end
+ else
+ begin
+ // wrong alignment -> copy each line separately.
+ // Note: for the last line unassigned memory (> last Surface.pixels element)
+ // will be copied to the padding area (last bytes of a row),
+ // but we do not care because the content of padding data is ignored anyhow.
+ for row := 0 to Surface.h do
+ begin
+ SetDIBits(0, Bitmap.Handle, row, 1, @PChar(Surface.pixels)[row * Surface.pitch],
+ BitmapInfo, DIB_RGB_COLORS);
+ end;
+ end;
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_UnlockSurface(Surface);
+
+ // assign Bitmap to JPEG and store the latter
+ Jpeg := TJPEGImage.Create;
+ Jpeg.Assign(Bitmap);
+ Bitmap.Free;
+ Jpeg.CompressionQuality := Quality;
+ try
+ // compress image (don't forget this line, otherwise it won't be compressed)
+ Jpeg.Compress();
+ Jpeg.SaveToFile(FileName);
+ except
+ Log.LogError('Could not save file: "' + FileName + '"', 'WriteJPGImage');
+ Exit;
+ end;
+ Jpeg.Free;
+ {$ELSE}
+ // based on example.pas in FPC's packages/base/pasjpeg directory
+
+ // only 24bit (RGB) data is supported, so convert to it
+ if (IsRGBSurface(Surface.format)) then
+ converted := false
+ else
+ begin
+ Surface := SDL_ConvertSurface(Surface, @PixelFmt_RGB, SDL_SWSURFACE);
+ converted := true;
+ end;
+
+ // allocate and initialize JPEG compression object
+ cinfo.err := jpeg_std_error(jerr);
+ // msg_level that will be displayed. (Nomssi)
+ //jerr.trace_level := 3;
+ // initialize the JPEG compression object
+ jpeg_create_compress(@cinfo);
+
+ // open file for writing
+ try
+ jpgFile := TFileStream.Create(FileName, fmCreate);
+ except
+ Log.LogError('Could not open file: "' + FileName + '"', 'WriteJPGImage');
+ Exit;
+ end;
+
+ // specify data destination
+ jpeg_stdio_dest(@cinfo, @jpgFile);
+
+ // set parameters for compression
+ cinfo.image_width := Surface.w;
+ cinfo.image_height := Surface.h;
+ cinfo.in_color_space := JCS_RGB;
+ cinfo.input_components := 3;
+ cinfo.data_precision := 8;
+
+ // set default compression parameters
+ jpeg_set_defaults(@cinfo);
+ jpeg_set_quality(@cinfo, quality, true);
+
+ // start compressor
+ jpeg_start_compress(@cinfo, true);
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_LockSurface(Surface);
+
+ while (cinfo.next_scanline < cinfo.image_height) do
+ begin
+ // Note: the byte-count of a row is pitch (which is not width*bitsPerPixel if the image is aligned)
+ rowPtr[0] := JSAMPROW(@PChar(Surface.pixels)[(Surface.h-cinfo.next_scanline-1) * Surface.pitch]);
+ jpeg_write_scanlines(@cinfo, JSAMPARRAY(@rowPtr), 1);
+ end;
+
+ if (SDL_MUSTLOCK(Surface)) then
+ SDL_UnlockSurface(Surface);
+
+ // finish compression
+ jpeg_finish_compress(@cinfo);
+ // close the output file
+ jpgFile.Free;
+
+ // release JPEG compression object
+ jpeg_destroy_compress(@cinfo);
+ {$ENDIF}
+
+ if (converted) then
+ SDL_FreeSurface(Surface);
+
+ Result := true;
+end;
+
+{$ENDIF}
+
+
+(*******************************************************
+ * Image loading
+ *******************************************************)
+
+
+(*
+ * Loads an image from the given file or resource
+ *)
+function LoadImage(const Identifier: string): PSDL_Surface;
+var
+ TexRWops: PSDL_RWops;
+ TexStream: TStream;
+ FileName: string;
+begin
+ Result := nil;
+ TexRWops := nil;
+
+ if Identifier = '' then
+ exit;
+
+ //Log.LogStatus( Identifier, 'LoadImage' );
+
+ FileName := Identifier;
+
+ if (FileExistsInsensitive(FileName)) then
+ begin
+ // load from file
+ //Log.LogStatus( 'Is File ( Loading : '+FileName+')', ' LoadImage' );
+ try
+ Result := IMG_Load(PChar(FileName));
+ //Log.LogStatus( ' '+inttostr( integer( Result ) ), ' LoadImage' );
+ except
+ Log.LogError('Could not load from file "'+FileName+'"', 'LoadImage');
+ Exit;
+ end;
+ end
+ else
+ begin
+ //Log.LogStatus( 'IS Resource, because file does not exist.('+Identifier+')', ' LoadImage' );
+
+ TexStream := GetResourceStream(Identifier, 'TEX');
+ if (not assigned(TexStream)) then
+ begin
+ Log.LogError( 'Invalid file or resource "'+ Identifier+'"', 'LoadImage');
+ Exit;
+ end;
+
+ TexRWops := RWopsFromStream(TexStream);
+ if (TexRWops = nil) then
+ begin
+ Log.LogError( 'Could not assign resource "'+Identifier+'"', 'LoadImage');
+ TexStream.Free();
+ Exit;
+ end;
+
+ //Log.LogStatus( 'resource Assigned....' , Identifier);
+ try
+ Result := IMG_Load_RW(TexRWops, 0);
+ except
+ Log.LogError( 'Could not read resource "'+Identifier+'"', 'LoadImage');
+ end;
+
+ SDL_FreeRW(TexRWops);
+ TexStream.Free();
+ end;
+end;
+
+
+(*******************************************************
+ * Image manipulation
+ *******************************************************)
+
+
+function PixelFormatEquals(fmt1, fmt2: PSDL_PixelFormat): boolean;
+begin
+ if (fmt1^.BitsPerPixel = fmt2^.BitsPerPixel) and
+ (fmt1^.BytesPerPixel = fmt2^.BytesPerPixel) and
+ (fmt1^.Rloss = fmt2^.Rloss) and (fmt1^.Gloss = fmt2^.Gloss) and
+ (fmt1^.Bloss = fmt2^.Bloss) and (fmt1^.Rmask = fmt2^.Rmask) and
+ (fmt1^.Gmask = fmt2^.Gmask) and (fmt1^.Bmask = fmt2^.Bmask) and
+ (fmt1^.Rshift = fmt2^.Rshift) and (fmt1^.Gshift = fmt2^.Gshift) and
+ (fmt1^.Bshift = fmt2^.Bshift)
+ then
+ Result := true
+ else
+ Result := false;
+end;
+
+procedure ScaleImage(var ImgSurface: PSDL_Surface; Width, Height: Cardinal);
+var
+ TempSurface: PSDL_Surface;
+begin
+ TempSurface := ImgSurface;
+ ImgSurface := SDL_ScaleSurfaceRect(TempSurface,
+ 0, 0, TempSurface^.W,TempSurface^.H,
+ Width, Height);
+ SDL_FreeSurface(TempSurface);
+end;
+
+procedure FitImage(var ImgSurface: PSDL_Surface; Width, Height: Cardinal);
+var
+ TempSurface: PSDL_Surface;
+ ImgFmt: PSDL_PixelFormat;
+begin
+ TempSurface := ImgSurface;
+
+ // create a new surface with given width and height
+ ImgFmt := TempSurface^.format;
+ ImgSurface := SDL_CreateRGBSurface(
+ SDL_SWSURFACE, Width, Height, ImgFmt^.BitsPerPixel,
+ ImgFmt^.RMask, ImgFmt^.GMask, ImgFmt^.BMask, ImgFmt^.AMask);
+
+ // copy image from temp- to new surface
+ SDL_SetAlpha(ImgSurface, 0, 255);
+ SDL_SetAlpha(TempSurface, 0, 255);
+ SDL_BlitSurface(TempSurface, nil, ImgSurface, nil);
+
+ SDL_FreeSurface(TempSurface);
+end;
+
+(*
+// Old slow floating point version of ColorizeTexture.
+// For an easier understanding of the faster fixed point version below.
+procedure ColorizeTexture(TexSurface: PSDL_Surface; Col: Cardinal);
+var
+ clr: array[0..2] of Double; // [0: R, 1: G, 2: B]
+ hsv: array[0..2] of Double; // [0: H(ue), 1: S(aturation), 2: V(alue)]
+ delta, f, p, q, t: Double;
+ max: Double;
+begin
+ clr[0] := PixelColors[0]/255;
+ clr[1] := PixelColors[1]/255;
+ clr[2] := PixelColors[2]/255;
+ max := maxvalue(clr);
+ delta := max - minvalue(clr);
+
+ hsv[0] := DestinationHue; // set H(ue)
+ hsv[2] := max; // set V(alue)
+ // calc S(aturation)
+ if (max = 0.0) then
+ hsv[1] := 0.0
+ else
+ hsv[1] := delta/max;
+
+ //ColorizePixel(PByteArray(Pixel), DestinationHue);
+ h_int := trunc(hsv[0]); // h_int = |_h_|
+ f := hsv[0]-h_int; // f = h-h_int
+ p := hsv[2]*(1.0-hsv[1]); // p = v*(1-s)
+ q := hsv[2]*(1.0-(hsv[1]*f)); // q = v*(1-s*f)
+ t := hsv[2]*(1.0-(hsv[1]*(1.0-f))); // t = v*(1-s*(1-f))
+ case h_int of
+ 0: begin clr[0] := hsv[2]; clr[1] := t; clr[2] := p; end; // (v,t,p)
+ 1: begin clr[0] := q; clr[1] := hsv[2]; clr[2] := p; end; // (q,v,p)
+ 2: begin clr[0] := p; clr[1] := hsv[2]; clr[2] := t; end; // (p,v,t)
+ 3: begin clr[0] := p; clr[1] := q; clr[2] := hsv[2]; end; // (p,q,v)
+ 4: begin clr[0] := t; clr[1] := p; clr[2] := hsv[2]; end; // (t,p,v)
+ 5: begin clr[0] := hsv[2]; clr[1] := p; clr[2] := q; end; // (v,p,q)
+ end;
+
+ // and store new rgb back into the image
+ PixelColors[0] := trunc(255*clr[0]);
+ PixelColors[1] := trunc(255*clr[1]);
+ PixelColors[2] := trunc(255*clr[2]);
+end;
+*)
+
+procedure ColorizeImage(ImgSurface: PSDL_Surface; NewColor: Cardinal);
+
+ //returns hue within range [0.0-6.0)
+ function col2hue(Color:Cardinal): double;
+ var
+ clr: array[0..2] of double;
+ hue, max, delta: double;
+ begin
+ clr[0] := ((Color and $ff0000) shr 16)/255; // R
+ clr[1] := ((Color and $ff00) shr 8)/255; // G
+ clr[2] := (Color and $ff) /255; // B
+ max := maxvalue(clr);
+ delta := max - minvalue(clr);
+ // calc hue
+ if (delta = 0.0) then hue := 0
+ else if (clr[0] = max) then hue := (clr[1]-clr[2])/delta
+ else if (clr[1] = max) then hue := 2.0+(clr[2]-clr[0])/delta
+ else if (clr[2] = max) then hue := 4.0+(clr[0]-clr[1])/delta;
+ if (hue < 0.0) then
+ hue := hue + 6.0;
+ Result := hue;
+ end;
+
+var
+ DestinationHue: Double;
+ PixelIndex: Cardinal;
+ Pixel: PByte;
+ PixelColors: PByteArray;
+ clr: array[0..2] of UInt32; // [0: R, 1: G, 2: B]
+ hsv: array[0..2] of UInt32; // [0: H(ue), 1: S(aturation), 2: V(alue)]
+ dhue: UInt32;
+ h_int: Cardinal;
+ delta, f, p, q, t: Longint;
+ max: Uint32;
+begin
+ DestinationHue := col2hue(NewColor);
+
+ dhue := Trunc(DestinationHue*1024);
+
+ Pixel := ImgSurface^.Pixels;
+
+ for PixelIndex := 0 to (ImgSurface^.W * ImgSurface^.H)-1 do
+ begin
+ PixelColors := PByteArray(Pixel);
+ // inlined colorize per pixel
+
+ // uses fixed point math
+ // get color values
+ clr[0] := PixelColors[0] shl 10;
+ clr[1] := PixelColors[1] shl 10;
+ clr[2] := PixelColors[2] shl 10;
+ //calculate luminance and saturation from rgb
+
+ max := clr[0];
+ if clr[1] > max then max := clr[1];
+ if clr[2] > max then max := clr[2];
+ delta := clr[0];
+ if clr[1] < delta then delta := clr[1];
+ if clr[2] < delta then delta := clr[2];
+ delta := max-delta;
+ hsv[0] := dhue; // shl 8
+ hsv[2] := max; // shl 8
+ if (max = 0) then
+ hsv[1] := 0
+ else
+ hsv[1] := (delta shl 10) div max; // shl 8
+ h_int := hsv[0] and $fffffC00;
+ f := hsv[0]-h_int; //shl 10
+ p := (hsv[2]*(1024-hsv[1])) shr 10;
+ q := (hsv[2]*(1024-(hsv[1]*f) shr 10)) shr 10;
+ t := (hsv[2]*(1024-(hsv[1]*(1024-f)) shr 10)) shr 10;
+ h_int := h_int shr 10;
+ case h_int of
+ 0: begin clr[0] := hsv[2]; clr[1] := t; clr[2] := p; end; // (v,t,p)
+ 1: begin clr[0] := q; clr[1] := hsv[2]; clr[2] := p; end; // (q,v,p)
+ 2: begin clr[0] := p; clr[1] := hsv[2]; clr[2] := t; end; // (p,v,t)
+ 3: begin clr[0] := p; clr[1] := q; clr[2] := hsv[2]; end; // (p,q,v)
+ 4: begin clr[0] := t; clr[1] := p; clr[2] := hsv[2]; end; // (t,p,v)
+ 5: begin clr[0] := hsv[2]; clr[1] := p; clr[2] := q; end; // (v,p,q)
+ end;
+
+ PixelColors[0] := clr[0] shr 10;
+ PixelColors[1] := clr[1] shr 10;
+ PixelColors[2] := clr[2] shr 10;
+
+ Inc(Pixel, ImgSurface^.format.BytesPerPixel);
+ end;
+end;
+
+end.
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 09:37:13 +0000