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edgedetectionmodifier.cpp
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40 /*
41  -----------------------------------------------------------------------------
42  This source file is part of ogre-procedural
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44  For the latest info, see http://code.google.com/p/ogre-procedural/
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46  Copyright (c) 2010-2013 Michael Broutin
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64  THE SOFTWARE.
65  -----------------------------------------------------------------------------
66  */
67 #ifndef _graphicsproceduraledgedetectionmodifier_cpp
68 #define _graphicsproceduraledgedetectionmodifier_cpp
69 
70 #include "Graphics/Procedural/Texture/edgedetectionmodifier.h"
71 #include "Graphics/Procedural/Texture/solidgenerator.h"
72 #include "Graphics/Procedural/Texture/blurmodifier.h"
73 
74 #include "MathTools/mathtools.h"
75 
76 namespace Mezzanine
77 {
78  namespace Graphics
79  {
80  namespace Procedural
81  {
82  EdgeDetectionModifier::EdgeDetectionModifier() :
83  EdgeDetect(EdgeDetectionModifier::DM_Sobel),
84  LowerThreshold(20),
85  UpperThreshold(100),
86  EdgeDetectionSigma(92)
87  { }
88 
89  EdgeDetectionModifier::~EdgeDetectionModifier()
90  { }
91 
92  void EdgeDetectionModifier::ProcessHomogenity(TextureBuffer& Buffer)
93  {
94  Integer TargetWidth = static_cast<Integer>( Buffer.GetWidth() );
95  Integer TargetHeight = static_cast<Integer>( Buffer.GetHeight() );
96 
97  TextureBuffer TempBuffer(Buffer.GetWidth(),Buffer.GetHeight());
98  SolidGenerator().SetColour(ColourValue::Black()).AddToTextureBuffer(TempBuffer);
99 
100  for( Integer Y = 0 ; Y < TargetHeight ; ++Y )
101  {
102  for( Integer X = 0 ; X < TargetWidth ; ++X )
103  {
104  Real PixelAlpha = Buffer.GetAlphaReal(static_cast<Whole>(X),static_cast<Whole>(Y));
105  VectorBlock Block = this->GetBlock(X,Y,Buffer);
106  Vector3 CenterColour = Block[4];
107  Vector3 Difference(0.0,0.0,0.0);
108  for( Integer Row = 0 ; Row < 3 ; ++Row )
109  {
110  for( Integer Column = 0 ; Column < 3 ; ++Column )
111  {
112  if( Row != 1 || Column != 1 ) {
113  Vector3 Temp = CenterColour - Block[Row * 3 + Column];
114  if( MathTools::Abs(Temp.X) > Difference.X ) Difference.X = MathTools::Abs(Temp.X);
115  if( MathTools::Abs(Temp.Y) > Difference.Y ) Difference.Y = MathTools::Abs(Temp.Y);
116  if( MathTools::Abs(Temp.Z) > Difference.Z ) Difference.Z = MathTools::Abs(Temp.Z);
117  }
118  }
119  }
120  TempBuffer.SetPixel(static_cast<Whole>(X),static_cast<Whole>(Y),ColourValue(Difference.X,Difference.Y,Difference.Z,PixelAlpha));
121  }
122  }
123 
124  Buffer.SetData(TempBuffer);
125  }
126 
127  void EdgeDetectionModifier::ProcessDifference(TextureBuffer& Buffer)
128  {
129  Integer TargetWidth = static_cast<Integer>( Buffer.GetWidth() );
130  Integer TargetHeight = static_cast<Integer>( Buffer.GetHeight() );
131 
132  TextureBuffer TempBuffer(Buffer.GetWidth(),Buffer.GetHeight());
133  SolidGenerator().SetColour(ColourValue::Black()).AddToTextureBuffer(TempBuffer);
134 
135  for( Integer Y = 0 ; Y < TargetHeight ; ++Y )
136  {
137  for( Integer X = 0 ; X < TargetWidth ; ++X )
138  {
139  Real PixelAlpha = Buffer.GetAlphaReal(static_cast<Whole>(X),static_cast<Whole>(Y));
140  VectorBlock Block = this->GetBlock(X,Y,Buffer);
141  Vector3 Difference(0.0,0.0,0.0);
142  Vector3 Temp(0.0,0.0,0.0);
143 
144  for( Integer Index = 0 ; Index < 3 ; ++Index )
145  {
146  Temp = Block[Index] - Block[6 + (2 - Index)];
147  if( MathTools::Abs(Temp.X) > Difference.X ) Difference.X = MathTools::Abs(Temp.X);
148  if( MathTools::Abs(Temp.Y) > Difference.Y ) Difference.Y = MathTools::Abs(Temp.Y);
149  if( MathTools::Abs(Temp.Z) > Difference.Z ) Difference.Z = MathTools::Abs(Temp.Z);
150  }
151  Temp = Block[5] - Block[3];
152  if( MathTools::Abs(Temp.X) > Difference.X ) Difference.X = MathTools::Abs(Temp.X);
153  if( MathTools::Abs(Temp.Y) > Difference.Y ) Difference.Y = MathTools::Abs(Temp.Y);
154  if( MathTools::Abs(Temp.Z) > Difference.Z ) Difference.Z = MathTools::Abs(Temp.Z);
155 
156  TempBuffer.SetPixel(static_cast<Whole>(X),static_cast<Whole>(Y),ColourValue(Difference.X,Difference.Y,Difference.Z,PixelAlpha));
157  }
158  }
159 
160  Buffer.SetData(TempBuffer);
161  }
162 
163  void EdgeDetectionModifier::ProcessSobel(TextureBuffer& Buffer)
164  {
165  Integer TargetWidth = static_cast<Integer>( Buffer.GetWidth() );
166  Integer TargetHeight = static_cast<Integer>( Buffer.GetHeight() );
167 
168  TextureBuffer TempBuffer(Buffer.GetWidth(),Buffer.GetHeight());
169  SolidGenerator().SetColour(ColourValue::Black()).AddToTextureBuffer(TempBuffer);
170 
171  for( Integer Y = 0 ; Y < TargetHeight ; ++Y )
172  {
173  for( Integer X = 0 ; X < TargetWidth ; ++X )
174  {
175  Real PixelAlpha = Buffer.GetAlphaReal(static_cast<Whole>(X),static_cast<Whole>(Y));
176  VectorBlock Block = this->GetBlock(X,Y,Buffer);
177 
178  Vector3 Temp1 = Block[0] + ( Block[1] * 2.0 ) + Block[2] - Block[6] - ( Block[7] * 2.0 ) - Block[8];
179  Temp1 = Vector3(MathTools::Abs(Temp1.X),MathTools::Abs(Temp1.Y),MathTools::Abs(Temp1.Z));
180  Vector3 Temp2 = Block[2] + ( Block[5] * 2.0 ) + Block[8] - Block[0] - ( Block[3] * 2.0 ) - Block[6];
181  Temp2 = Vector3(MathTools::Abs(Temp2.X),MathTools::Abs(Temp2.Y),MathTools::Abs(Temp2.Z));
182  Vector3 Difference = Temp1 + Temp2;
183 
184  TempBuffer.SetPixel(static_cast<Whole>(X),static_cast<Whole>(Y),ColourValue(Difference.X,Difference.Y,Difference.Z,PixelAlpha));
185  }
186  }
187 
188  Buffer.SetData(TempBuffer);
189  }
190 
191  void EdgeDetectionModifier::ProcessCanny(TextureBuffer& Buffer)
192  {
193  Integer TargetWidth = static_cast<Integer>( Buffer.GetWidth() );
194  Integer TargetHeight = static_cast<Integer>( Buffer.GetHeight() );
195 
196  TextureBuffer TempBuffer(Buffer.GetWidth(),Buffer.GetHeight());
197  SolidGenerator().SetColour(ColourValue::Black()).AddToTextureBuffer(TempBuffer);
198 
199  // STEP 1 - blur image
200  BlurModifier().SetSigma(this->EdgeDetectionSigma).SetBlurType(BlurModifier::BT_Gaussian).Modify(Buffer);
201 
202  // STEP 2 - calculate magnitude and edge Orientations
203  Real Div = 0.0;
204  VectorContainer Orientations(TargetWidth * TargetHeight);
205  VectorContainer Gradients(TargetWidth * TargetHeight);
206  Vector3 Difference = Vector3(-std::numeric_limits<Real>::infinity(),-std::numeric_limits<Real>::infinity(),-std::numeric_limits<Real>::infinity());
207  for( Integer Y = 0 ; Y < TargetHeight ; ++Y )
208  {
209  for( Integer X = 0 ; X < TargetWidth ; ++X )
210  {
211  VectorContainer Block = this->GetBlock(X,Y,Buffer);
212  Vector3 TempVec1 = Block[2] + Block[8] - Block[0] - Block[6] + ( ( Block[5] - Block[3] ) * 2.0 );
213  Vector3 TempVec2 = Block[0] + Block[2] - Block[6] - Block[8] + ( ( Block[1] - Block[7] ) * 2.0 );
214  Gradients[Y * TargetWidth + X] = Vector3(MathTools::Sqrt(TempVec1.X * TempVec1.X + TempVec2.X * TempVec2.X), MathTools::Sqrt(TempVec1.Y * TempVec1.Y + TempVec2.Y * TempVec2.Y), MathTools::Sqrt(TempVec1.Z * TempVec1.Z + TempVec2.Z * TempVec2.Z));
215  if( Gradients[Y * TargetWidth + X].X > Difference.X ) Difference.X = Gradients[Y * TargetWidth + X].X;
216  if( Gradients[Y * TargetWidth + X].Y > Difference.Y ) Difference.Y = Gradients[Y * TargetWidth + X].Y;
217  if( Gradients[Y * TargetWidth + X].Z > Difference.Z ) Difference.Z = Gradients[Y * TargetWidth + X].Z;
218  Orientations[Y * TargetWidth + X].Zero();
219  if( TempVec1.X == 0.0 ) {
220  Orientations[Y * TargetWidth + X].X = ( TempVec2.X == 0.0 ) ? 0.0 : 90.0;
221  }else{
222  Div = TempVec2.X / TempVec1.X;
223  if( Div < 0.0 ) {
224  Orientations[Y * TargetWidth + X].X = 180.0 - ( MathTools::ATan(-Div) * MathTools::GetRadToDegMultiplier() );
225  }else{
226  Orientations[Y * TargetWidth + X].X = ( MathTools::ATan(Div) * MathTools::GetRadToDegMultiplier() );
227  }
228 
229  if( Orientations[Y * TargetWidth + X].X < 22.5 ) {
230  Orientations[Y * TargetWidth + X].X = 0.0;
231  }else if( Orientations[Y * TargetWidth + X].X < 67.5 ) {
232  Orientations[Y * TargetWidth + X].X = 45.0;
233  }else if( Orientations[Y * TargetWidth + X].X < 112.5 ) {
234  Orientations[Y * TargetWidth + X].X = 90.0;
235  }else if( Orientations[Y * TargetWidth + X].X < 157.5 ) {
236  Orientations[Y * TargetWidth + X].X = 135.0;
237  }else{
238  Orientations[Y * TargetWidth + X].X = 0.0;
239  }
240  }
241  if( TempVec1.Y == 0.0 ) {
242  Orientations[Y * TargetWidth + X].Y = ( TempVec2.Y == 0.0 ) ? 0.0 : 90.0;
243  }else{
244  Div = TempVec2.Y / TempVec1.Y;
245  if( Div < 0.0 ) {
246  Orientations[Y * TargetWidth + X].Y = 180.0 - ( MathTools::ATan(-Div) * MathTools::GetRadToDegMultiplier() );
247  }else{
248  Orientations[Y * TargetWidth + X].Y = ( MathTools::ATan(Div) * MathTools::GetRadToDegMultiplier() );
249  }
250 
251  if( Orientations[Y * TargetWidth + X].Y < 22.5 ) {
252  Orientations[Y * TargetWidth + X].Y = 0.0;
253  }else if( Orientations[Y * TargetWidth + X].Y < 67.5 ) {
254  Orientations[Y * TargetWidth + X].Y = 45.0;
255  }else if( Orientations[Y * TargetWidth + X].Y < 112.5 ) {
256  Orientations[Y * TargetWidth + X].Y = 90.0;
257  }else if( Orientations[Y * TargetWidth + X].Y < 157.5 ) {
258  Orientations[Y * TargetWidth + X].Y = 135.0;
259  }else{
260  Orientations[Y * TargetWidth + X].Y = 0.0;
261  }
262  }
263  if( TempVec1.Z == 0.0 ) {
264  Orientations[Y * TargetWidth + X].Z = ( TempVec2.Z == 0.0 ) ? 0.0 : 90.0;
265  }else{
266  Div = TempVec2.Z / TempVec1.Z;
267  if( Div < 0.0 ) {
268  Orientations[Y * TargetWidth + X].Z = 180.0 - ( MathTools::ATan(-Div) * MathTools::GetRadToDegMultiplier() );
269  }else{
270  Orientations[Y * TargetWidth + X].Z = ( MathTools::ATan(Div) * MathTools::GetRadToDegMultiplier() );
271  }
272 
273  if( Orientations[Y * TargetWidth + X].Z < 22.5 ) {
274  Orientations[Y * TargetWidth + X].Z = 0.0;
275  }else if( Orientations[Y * TargetWidth + X].Z < 67.5 ) {
276  Orientations[Y * TargetWidth + X].Z = 45.0;
277  }else if( Orientations[Y * TargetWidth + X].Z < 112.5 ) {
278  Orientations[Y * TargetWidth + X].Z = 90.0;
279  }else if( Orientations[Y * TargetWidth + X].Z < 157.5 ) {
280  Orientations[Y * TargetWidth + X].Z = 135.0;
281  }else{
282  Orientations[Y * TargetWidth + X].Z = 0.0;
283  }
284  }
285  }
286  }
287 
288  // STEP 3 - suppres non maximums
289  for( Integer Y = 1 ; Y < ( TargetHeight - 1 ) ; ++Y )
290  {
291  for( Integer X = 1 ; X < ( TargetWidth - 1 ) ; ++X )
292  {
293  Div = Gradients[Y * TargetWidth + X].X / Difference.X;
294  switch( static_cast<Integer>( Orientations[Y * TargetWidth + X].X ) )
295  {
296  default:
297  case 0:
298  {
299  if( ( Gradients[Y * TargetWidth + X].X < Gradients[Y * TargetWidth + (X - 1)].X ) || ( Gradients[Y * TargetWidth + X].X < Gradients[Y * TargetWidth + (X + 1)].X ) ) {
300  Div = 0.0;
301  }
302  break;
303  }
304  case 45:
305  {
306  if( ( Gradients[Y * TargetWidth + X].X < Gradients[(Y + 1) * TargetWidth + (X - 1)].X ) || ( Gradients[Y * TargetWidth + X].X < Gradients[(Y - 1) * TargetWidth + (X + 1)].X ) ) {
307  Div = 0.0;
308  }
309  break;
310  }
311  case 90:
312  {
313  if( ( Gradients[Y * TargetWidth + X].X < Gradients[(Y + 1) * TargetWidth + X].X ) || ( Gradients[Y * TargetWidth + X].X < Gradients[(Y - 1) * TargetWidth + X].X ) ) {
314  Div = 0.0;
315  }
316  break;
317  }
318  case 135:
319  {
320  if( ( Gradients[Y * TargetWidth + X].X < Gradients[(Y + 1) * TargetWidth + (X + 1)].X ) || ( Gradients[Y * TargetWidth + X].X < Gradients[(Y - 1) * TargetWidth + (X - 1)].X ) ) {
321  Div = 0.0;
322  }
323  break;
324  }
325  }
326  TempBuffer.SetRedReal( static_cast<Whole>(X), static_cast<Whole>(Y), Div );
327  Div = Gradients[Y * TargetWidth + X].Y / Difference.Y;
328  switch( static_cast<Integer>( Orientations[Y * TargetWidth + X].Y ) )
329  {
330  default:
331  case 0:
332  {
333  if( ( Gradients[Y * TargetWidth + X].Y < Gradients[Y * TargetWidth + (X - 1)].Y ) || ( Gradients[Y * TargetWidth + X].Y < Gradients[Y * TargetWidth + (X + 1)].Y ) ) {
334  Div = 0.0;
335  }
336  break;
337  }
338  case 45:
339  {
340  if( ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y + 1) * TargetWidth + (X - 1)].Y ) || ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y - 1) * TargetWidth + (X + 1)].Y ) ) {
341  Div = 0.0;
342  }
343  break;
344  }
345  case 90:
346  {
347  if( ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y + 1) * TargetWidth + X].Y ) || ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y - 1) * TargetWidth + X].Y ) ) {
348  Div = 0.0;
349  }
350  break;
351  }
352  case 135:
353  {
354  if( ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y + 1) * TargetWidth + (X + 1)].Y ) || ( Gradients[Y * TargetWidth + X].Y < Gradients[(Y - 1) * TargetWidth + (X - 1)].Y ) ) {
355  Div = 0.0;
356  }
357  break;
358  }
359  }
360  TempBuffer.SetGreenReal( static_cast<Whole>(X), static_cast<Whole>(Y), Div );
361  Div = Gradients[Y * TargetWidth + X].Z / Difference.Z;
362  switch( static_cast<Integer>( Orientations[Y * TargetWidth + X].Z ) )
363  {
364  default:
365  case 0:
366  {
367  if( ( Gradients[Y * TargetWidth + X].Z < Gradients[Y * TargetWidth + (X - 1)].Z ) || ( Gradients[Y * TargetWidth + X].Z < Gradients[Y * TargetWidth + (X + 1)].Z ) ) {
368  Div = 0.0;
369  }
370  break;
371  }
372  case 45:
373  {
374  if( ( Gradients[Y * TargetWidth + X].Z < Gradients[(Y + 1) * TargetWidth + (X - 1)].Z ) || ( Gradients[Y * TargetWidth + X].Z < Gradients[(Y - 1) * TargetWidth + (X + 1)].Z ) ) {
375  Div = 0.0;
376  }
377  break;
378  }
379  case 90:
380  {
381  if( ( Gradients[Y * TargetWidth + X].Z < Gradients[(Y + 1) * TargetWidth + X].Z ) || ( Gradients[Y * TargetWidth + X].Z < Gradients[(Y - 1) * TargetWidth + X].Z ) ) {
382  Div = 0.0;
383  }
384  break;
385  }
386  case 135:
387  {
388  if( (Gradients[Y * TargetWidth + X].Z < Gradients[(Y + 1) * TargetWidth + (X + 1)].Z ) || ( Gradients[Y * TargetWidth + X].Z < Gradients[(Y - 1) * TargetWidth + (X - 1)].Z ) ) {
389  Div = 0.0;
390  }
391  break;
392  }
393  }
394  TempBuffer.SetBlueReal( static_cast<Whole>(X), static_cast<Whole>(Y), Div );
395  }
396  }
397 
398  // STEP 4 - hysteresis
399  Buffer.SetData(TempBuffer);
400  Real MaxThreshold = static_cast<Real>( this->UpperThreshold ) / 255.0;
401  for( Integer Y = 1 ; Y < ( TargetHeight - 1 ) ; ++Y )
402  {
403  for( Integer X = 1 ; X < ( TargetWidth - 1 ) ; ++X )
404  {
405  ColourValue Pixel = Buffer.GetPixel(static_cast<Whole>(X), static_cast<Whole>(Y));
406  if( Pixel.RedChannel < MaxThreshold )
407  {
408  if( Pixel.RedChannel < static_cast<Real>( this->LowerThreshold ) / 255.0 )
409  TempBuffer.SetRedReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
410  else
411  {
412  if( ( Buffer.GetRedReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
413  ( Buffer.GetRedReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
414  ( Buffer.GetRedReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
415  ( Buffer.GetRedReal(static_cast<Whole>(X ),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
416  ( Buffer.GetRedReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
417  ( Buffer.GetRedReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
418  ( Buffer.GetRedReal(static_cast<Whole>(X ),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
419  ( Buffer.GetRedReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) )
420  {
421  TempBuffer.SetRedReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
422  }
423  }
424  }
425  if( Pixel.GreenChannel < MaxThreshold )
426  {
427  if( Pixel.GreenChannel < static_cast<Real>( this->LowerThreshold ) / 255.0 )
428  TempBuffer.SetGreenReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
429  else
430  {
431  if( ( Buffer.GetGreenReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
432  ( Buffer.GetGreenReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
433  ( Buffer.GetGreenReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
434  ( Buffer.GetGreenReal(static_cast<Whole>(X ),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
435  ( Buffer.GetGreenReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
436  ( Buffer.GetGreenReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
437  ( Buffer.GetGreenReal(static_cast<Whole>(X ),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
438  ( Buffer.GetGreenReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) )
439  {
440  TempBuffer.SetGreenReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
441  }
442  }
443  }
444  if( Pixel.BlueChannel < MaxThreshold )
445  {
446  if( Pixel.BlueChannel < static_cast<Real>( this->LowerThreshold ) / 255.0 )
447  TempBuffer.SetBlueReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
448  else
449  {
450  if( ( Buffer.GetBlueReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
451  ( Buffer.GetBlueReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y )) < MaxThreshold ) &&
452  ( Buffer.GetBlueReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
453  ( Buffer.GetBlueReal(static_cast<Whole>(X ),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
454  ( Buffer.GetBlueReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y - 1)) < MaxThreshold ) &&
455  ( Buffer.GetBlueReal(static_cast<Whole>(X - 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
456  ( Buffer.GetBlueReal(static_cast<Whole>(X ),static_cast<Whole>(Y + 1)) < MaxThreshold ) &&
457  ( Buffer.GetBlueReal(static_cast<Whole>(X + 1),static_cast<Whole>(Y + 1)) < MaxThreshold ) )
458  {
459  TempBuffer.SetBlueReal( static_cast<Whole>(X), static_cast<Whole>(Y), 0.0 );
460  }
461  }
462  }
463  }
464  }
465 
466  Buffer.SetData(TempBuffer);
467  }
468 
469  EdgeDetectionModifier::VectorBlock EdgeDetectionModifier::GetBlock(const Integer X, const Integer Y, TextureBuffer& Buffer) const
470  {
471  VectorBlock Block(9);
472  ColourValue Pixel = Buffer.GetPixel(static_cast<Whole>(X),static_cast<Whole>(Y));
473  for( Integer Row = -1 ; Row < 2 ; ++Row )
474  {
475  for( Integer Column = -1 ; Column < 2 ; ++Column )
476  {
477  Integer CurrIndex = ( Row + 1 ) * 3 + ( Column + 1 );
478  // Assign safe default of no change
479  Block[CurrIndex].SetValues(Pixel.RedChannel,Pixel.GreenChannel,Pixel.BlueChannel);
480  if( Row != 0 || Column != 0 ) {
481  if( ( X + Column ) < 0 || ( X + Column ) >= static_cast<Integer>( Buffer.GetWidth() ) ) {
482  continue;
483  }
484  if( ( Y + Row ) < 0 || ( Y + Row ) >= static_cast<Integer>( Buffer.GetHeight() ) ) {
485  continue;
486  }
487  // Apply the change now that we know we have a valid pixel that isn't the current Pixel
488  Block[CurrIndex].SetValues( Buffer.GetRedReal(static_cast<Whole>(X+Column),static_cast<Whole>(Y+Row)),
489  Buffer.GetGreenReal(static_cast<Whole>(X+Column),static_cast<Whole>(Y+Row)),
490  Buffer.GetBlueReal(static_cast<Whole>(X+Column),static_cast<Whole>(Y+Row)) );
491  }
492  }
493  }
494  return Block;
495  }
496 
497  ///////////////////////////////////////////////////////////////////////////////
498  // Utility
499 
500  void EdgeDetectionModifier::Modify(TextureBuffer& Buffer)
501  {
502  switch( this->EdgeDetect )
503  {
504  case EdgeDetectionModifier::DM_Homogenity: this->ProcessHomogenity(Buffer); break;
505  case EdgeDetectionModifier::DM_Difference: this->ProcessDifference(Buffer); break;
506  default:
507  case EdgeDetectionModifier::DM_Sobel: this->ProcessSobel(Buffer); break;
508  case EdgeDetectionModifier::DM_Canny: this->ProcessCanny(Buffer); break;
509  }
510  }
511 
512  String EdgeDetectionModifier::GetName() const
513  { return "EdgeDetectionModifier"; }
514 
515  ///////////////////////////////////////////////////////////////////////////////
516  // Configuration
517 
518  EdgeDetectionModifier& EdgeDetectionModifier::SetDetectionType(const DetectionMode Mode)
519  {
520  this->EdgeDetect = Mode;
521  return *this;
522  }
523 
524  EdgeDetectionModifier& EdgeDetectionModifier::SetLowerThreshold(const UInt8 Low)
525  {
526  this->LowerThreshold = Low;
527  return *this;
528  }
529 
530  EdgeDetectionModifier& EdgeDetectionModifier::SetUpperThreshold(const UInt8 High)
531  {
532  this->UpperThreshold = High;
533  return *this;
534  }
535 
536  EdgeDetectionModifier& EdgeDetectionModifier::SetEdgeDetectionSigma(const UInt8 Sigma)
537  {
538  this->EdgeDetectionSigma = Sigma;
539  return *this;
540  }
541  }//Procedural
542  }//Graphics
543 }//Mezzanine
544 
545 #endif
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::GetBlock
VectorBlock GetBlock(const Integer X, const Integer Y, TextureBuffer &Buffer) const
Gets the colours of the specified pixel and all surrounding pixels.
Definition: edgedetectionmodifier.cpp:469
Mezzanine::Graphics::Procedural::TextureBuffer::GetPixel
ColourChannelType & GetPixel(const Whole X, const Whole Y, const UInt16 Component)
Gets access to the pixel at the specified position in this buffer. the X or Y location go beyond the ...
Definition: texturebuffer.cpp:133
Mezzanine::Vector3::X
Real X
Coordinate on the X vector.
Definition: vector3.h:85
Mezzanine::Vector3::Z
Real Z
Coordinate on the Z vector.
Definition: vector3.h:89
Mezzanine::Graphics::Procedural::TextureBuffer::GetBlueReal
Real GetBlueReal(const Whole X, const Whole Y) const
Gets the blue colour value of a specified pixel. the X or Y location go beyond the set size of this t...
Definition: texturebuffer.cpp:273
Mezzanine::Graphics::Procedural::TextureBuffer::GetWidth
Whole GetWidth() const
Get the pixel width of this texture.
Definition: texturebuffer.cpp:171
Mezzanine::Graphics::Procedural::TextureBuffer::GetAlphaReal
Real GetAlphaReal(const Whole X, const Whole Y) const
Gets the alpha colour value of a specified pixel. the X or Y location go beyond the set size of this ...
Definition: texturebuffer.cpp:289
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::DM_Sobel
Use the Sobel Operator algorithm to detect edges.
Definition: edgedetectionmodifier.h:92
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::EdgeDetect
DetectionMode EdgeDetect
The algorithm to use to detect edges.
Definition: edgedetectionmodifier.h:103
Mezzanine::Integer
int Integer
A datatype used to represent any integer close to.
Definition: datatypes.h:154
Mezzanine::Graphics::Procedural::TextureBuffer::GetGreenReal
Real GetGreenReal(const Whole X, const Whole Y) const
Gets the green colour value of a specified pixel. the X or Y location go beyond the set size of this ...
Definition: texturebuffer.cpp:257
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::DM_Canny
Use the Canny multi-stage algorthm to detect edges.
Definition: edgedetectionmodifier.h:93
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::UpperThreshold
UInt8 UpperThreshold
The highest value for each colour channel that will be considered valid.
Definition: edgedetectionmodifier.h:109
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::GetName
virtual String GetName() const
Gets the name of this modifier.
Definition: edgedetectionmodifier.cpp:512
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::ProcessDifference
void ProcessDifference(TextureBuffer &Buffer)
Detect edges in the provided texture by processing pixels above and below the current pixel...
Definition: edgedetectionmodifier.cpp:127
Mezzanine::Graphics::Procedural::BlurModifier::Modify
virtual void Modify(TextureBuffer &Buffer)
Alters the generated pixels in a TextureBuffer.
Definition: blurmodifier.cpp:93
Mezzanine::Graphics::Procedural::SolidGenerator
Fills full image with given colour.
Definition: solidgenerator.h:82
Mezzanine::ColourValue::Black
static ColourValue Black()
Creates a ColourValue representing the colour Black.
Definition: colourvalue.cpp:207
Mezzanine::Graphics::Procedural::SolidGenerator::SetColour
SolidGenerator & SetColour(const ColourValue &Colour)
Sets the colour of the background.
Definition: solidgenerator.cpp:105
Mezzanine::UInt8
uint8_t UInt8
An 8-bit unsigned integer.
Definition: datatypes.h:118
Mezzanine::ColourValue
This is a simple class for holding 4 reals representing the colour any give object or lightsource can...
Definition: colourvalue.h:64
Mezzanine::Graphics::Procedural::SolidGenerator::AddToTextureBuffer
virtual void AddToTextureBuffer(TextureBuffer &Buffer) const
Replaces and populates the pixels as configured in this generator to a TextureBuffer.
Definition: solidgenerator.cpp:88
Mezzanine::Graphics::Procedural::BlurModifier
A modifier that will attempt to reduce the sharpness of the texture.
Definition: blurmodifier.h:82
Mezzanine::Real
float Real
A Datatype used to represent a real floating point number.
Definition: datatypes.h:141
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::SetDetectionType
EdgeDetectionModifier & SetDetectionType(const DetectionMode Mode)
Sets the detection algorith to use for detecting edges.
Definition: edgedetectionmodifier.cpp:518
Mezzanine::Graphics::Procedural::BlurModifier::SetSigma
BlurModifier & SetSigma(const UInt8 Sigma)
Sets the sigma for each each pixel to be processed.
Definition: blurmodifier.cpp:155
Mezzanine::ColourValue::GreenChannel
Real GreenChannel
Value from 0.0 to 1.0 representing the amount of green present in the colour. 1.0 if very green...
Definition: colourvalue.h:73
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::VectorContainer
std::vector< Vector3 > VectorContainer
Convenience typedef for an array of Vector3's.
Definition: edgedetectionmodifier.h:97
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::ProcessSobel
void ProcessSobel(TextureBuffer &Buffer)
Detect edges using the Sobel Operator.
Definition: edgedetectionmodifier.cpp:163
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::VectorBlock
VectorContainer VectorBlock
Convenience typedef for returning a 3x3 matrix of Vector3's containing colour data.
Definition: edgedetectionmodifier.h:99
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::LowerThreshold
UInt8 LowerThreshold
The lowest value for each colour channel that will be considered valid.
Definition: edgedetectionmodifier.h:106
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::DetectionMode
DetectionMode
An enum describing which algorithm to use for edge detection.
Definition: edgedetectionmodifier.h:88
Mezzanine::Graphics::Procedural::EdgeDetectionModifier
A modifier that will reduce the texture to an outline of the detected edges in the texture...
Definition: edgedetectionmodifier.h:84
Mezzanine::Vector3::Y
Real Y
Coordinate on the Y vector.
Definition: vector3.h:87
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::SetEdgeDetectionSigma
EdgeDetectionModifier & SetEdgeDetectionSigma(const UInt8 Sigma)
Sets the sigma for the blur stage of the Canny filter.
Definition: edgedetectionmodifier.cpp:536
Mezzanine::Graphics::Procedural::BlurModifier::SetBlurType
BlurModifier & SetBlurType(const BlurType Blur)
Sets the type of bluring operation to be used.
Definition: blurmodifier.cpp:143
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::DM_Homogenity
Detect edges based on difference in colour between the pixel being processed and all surrounding pixe...
Definition: edgedetectionmodifier.h:90
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::SetUpperThreshold
EdgeDetectionModifier & SetUpperThreshold(const UInt8 High)
Sets the upper threshold for the Canny filter.
Definition: edgedetectionmodifier.cpp:530
Mezzanine::Graphics::Procedural::TextureBuffer::GetRedReal
Real GetRedReal(const Whole X, const Whole Y) const
Gets the red colour value of a specified pixel. the X or Y location go beyond the set size of this te...
Definition: texturebuffer.cpp:241
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::ProcessCanny
void ProcessCanny(TextureBuffer &Buffer)
Detect edges using the Canny multi-stage algorithm.
Definition: edgedetectionmodifier.cpp:191
Mezzanine::Graphics::Procedural::TextureBuffer
A convenience buffer that stores pixel colour values of a texture to be generated.
Definition: texturebuffer.h:86
Mezzanine::Vector3
This is used to represent a point in space, or a vector through space.
Definition: vector3.h:77
Mezzanine
The bulk of the engine components go in this namspace.
Definition: actor.cpp:56
Mezzanine::Graphics::Procedural::TextureBuffer::GetHeight
Whole GetHeight() const
Get the pixel height of this texture.
Definition: texturebuffer.cpp:174
Mezzanine::ColourValue::BlueChannel
Real BlueChannel
Value from 0.0 to 1.0 representing the amount of blue present in the colour. 1.0 if very blue...
Definition: colourvalue.h:76
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::ProcessHomogenity
void ProcessHomogenity(TextureBuffer &Buffer)
Detect edges in the provided texture by processing all surrounding pixels.
Definition: edgedetectionmodifier.cpp:92
Mezzanine::ColourValue::RedChannel
Real RedChannel
Value from 0.0 to 1.0 representing the amount of red present in the colour. 1.0 if very red...
Definition: colourvalue.h:70
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::DM_Difference
Detect edges based on difference in colour between opposite surrounding pixels.
Definition: edgedetectionmodifier.h:91
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::EdgeDetectionSigma
UInt8 EdgeDetectionSigma
The sigma to set for the blur step of the Canny filter.
Definition: edgedetectionmodifier.h:112
Mezzanine::String
std::string String
A datatype used to a series of characters.
Definition: datatypes.h:159
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::SetLowerThreshold
EdgeDetectionModifier & SetLowerThreshold(const UInt8 Low)
Sets the lower threshold for the Canny filter.
Definition: edgedetectionmodifier.cpp:524
Mezzanine::Graphics::Procedural::TextureBuffer::SetData
void SetData(const TextureBuffer &Other)
Copies image data from another buffer into this buffer.
Definition: texturebuffer.cpp:154
Mezzanine::Graphics::Procedural::EdgeDetectionModifier::Modify
virtual void Modify(TextureBuffer &Buffer)
Alters the generated pixels in a TextureBuffer.
Definition: edgedetectionmodifier.cpp:500
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