// For memcpy
#include <string.h>
+#include <math.h>
#ifdef __SALFORDC__
#undef FAR
void wxImage::Create( int width, int height )
{
+ UnRef();
+
m_refData = new wxImageRefData();
M_IMGDATA->m_data = (unsigned char *) malloc( width*height*3 );
wxCHECK_RET( Ok(), wxT("invalid image") );
char unsigned *data = GetData();
-
+
const int w = GetWidth();
const int h = GetHeight();
for (int j = 0; j < h; j++)
for (int i = 0; i < w; i++)
- {
- if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
- {
- data[0] = r2;
- data[1] = g2;
- data[2] = b2;
- }
- data += 3;
- }
+ {
+ if ((data[0] == r1) && (data[1] == g1) && (data[2] == b1))
+ {
+ data[0] = r2;
+ data[1] = g2;
+ data[2] = b2;
+ }
+ data += 3;
+ }
}
void wxImage::SetRGB( int x, int y, unsigned char r, unsigned char g, unsigned char b )
if (wxFileExists(filename))
{
wxFileInputStream stream(filename);
- wxBufferedInputStream bstream( stream );
+ wxBufferedInputStream bstream( stream );
return LoadFile(bstream, type);
}
else
if (wxFileExists(filename))
{
wxFileInputStream stream(filename);
- wxBufferedInputStream bstream( stream );
+ wxBufferedInputStream bstream( stream );
return LoadFile(bstream, mimetype);
}
else
if ( stream.LastError() == wxStream_NOERROR )
{
- wxBufferedOutputStream bstream( stream );
+ wxBufferedOutputStream bstream( stream );
return SaveFile(bstream, type);
}
else
if ( stream.LastError() == wxStream_NOERROR )
{
- wxBufferedOutputStream bstream( stream );
+ wxBufferedOutputStream bstream( stream );
return SaveFile(bstream, mimetype);
}
else
{
wxImageHandler *handler=(wxImageHandler*)node->GetData();
if (handler->CanRead( stream ))
- return TRUE;
+ return TRUE;
}
return FALSE;
if( HasMask() )
{
hbitmap = ::CreateBitmap( (WORD)width, (WORD)bmpHeight, 1, 1, NULL );
- ::SelectObject( memdc, hbitmap);
+ HGDIOBJ hbmpOld = ::SelectObject( memdc, hbitmap);
if( numDIB == 1 ) height = bmpHeight;
else height = sizeLimit/bytePerLine;
lpDIBh->bmiHeader.biHeight = (DWORD)(-height);
for(i=0; i<width; i++ )
{
// was causing a code gen bug in cw : if( ( cr !=r) || (cg!=g) || (cb!=b) )
- unsigned char cr = (*(ptdata++)) ;
- unsigned char cg = (*(ptdata++)) ;
- unsigned char cb = (*(ptdata++)) ;
-
+ unsigned char cr = (*(ptdata++)) ;
+ unsigned char cg = (*(ptdata++)) ;
+ unsigned char cb = (*(ptdata++)) ;
+
if( ( cr !=r) || (cg!=g) || (cb!=b) )
{
*(ptbits++) = one;
wxMask *mask = new wxMask( bitmap, colour );
bitmap.SetMask( mask );
*/
+
+ ::SelectObject( memdc, hbmpOld );
}
// free allocated resources
- ::SelectObject( memdc, 0 );
::DeleteDC( memdc );
::ReleaseDC(NULL, hdc);
free(lpDIBh);
if (HasMask())
{
- /*
+ /*
unsigned char *mask_data = (unsigned char*)malloc( ((width >> 3)+8) * height );
mask_image = gdk_image_new_bitmap( gdk_visual_get_system(), mask_data, width, height );
int g_mask = GetMaskGreen();
int b_mask = GetMaskBlue();
- CGrafPtr origPort ;
- GDHandle origDevice ;
-
- GetGWorld( &origPort , &origDevice ) ;
- SetGWorld( bitmap.GetHBITMAP() , NULL ) ;
+ CGrafPtr origPort ;
+ GDHandle origDevice ;
+
+ GetGWorld( &origPort , &origDevice ) ;
+ SetGWorld( bitmap.GetHBITMAP() , NULL ) ;
register unsigned char* data = GetData();
{
for (int x = 0; x < width; x++)
{
- unsigned char r = data[index++];
- unsigned char g = data[index++];
- unsigned char b = data[index++];
- RGBColor color ;
- color.red = ( r << 8 ) + r ;
- color.green = ( g << 8 ) + g ;
- color.blue = ( b << 8 ) + b ;
- SetCPixel( x , y , &color ) ;
- }
+ unsigned char r = data[index++];
+ unsigned char g = data[index++];
+ unsigned char b = data[index++];
+ RGBColor color ;
+ color.red = ( r << 8 ) + r ;
+ color.green = ( g << 8 ) + g ;
+ color.blue = ( b << 8 ) + b ;
+ SetCPixel( x , y , &color ) ;
+ }
} // for height
- SetGWorld( origPort , origDevice ) ;
+ SetGWorld( origPort , origDevice ) ;
if ( HasMask() )
{
ptbits += 3;
}
ptbits += padding;
- }
+ }
// similarly, set data according to the possible mask bitmap
if( bitmap.GetMask() && bitmap.GetMask()->GetMaskBitmap() )
#include <gdk/gdkrgb.h>
#endif
+extern GtkWidget *wxRootWindow;
+
wxBitmap wxImage::ConvertToMonoBitmap( unsigned char red, unsigned char green, unsigned char blue )
{
wxBitmap bitmap;
bitmap.SetHeight( height );
bitmap.SetWidth( width );
- bitmap.SetBitmap( gdk_pixmap_new( (GdkWindow*)&gdk_root_parent, width, height, 1 ) );
-
+ bitmap.SetBitmap( gdk_pixmap_new( wxRootWindow->window, width, height, 1 ) );
+
bitmap.SetDepth( 1 );
+ GdkVisual *visual = gdk_window_get_visual( wxRootWindow->window );
+ wxASSERT( visual );
+
// Create picture image
unsigned char *data_data = (unsigned char*)malloc( ((width >> 3)+8) * height );
-
+
GdkImage *data_image =
- gdk_image_new_bitmap( gdk_visual_get_system(), data_data, width, height );
+ gdk_image_new_bitmap( visual, data_data, width, height );
// Create mask image
{
unsigned char *mask_data = (unsigned char*)malloc( ((width >> 3)+8) * height );
- mask_image = gdk_image_new_bitmap( gdk_visual_get_system(), mask_data, width, height );
+ mask_image = gdk_image_new_bitmap( visual, mask_data, width, height );
wxMask *mask = new wxMask();
- mask->m_bitmap = gdk_pixmap_new( (GdkWindow*)&gdk_root_parent, width, height, 1 );
+ mask->m_bitmap = gdk_pixmap_new( wxRootWindow->window, width, height, 1 );
bitmap.SetMask( mask );
}
else
gdk_image_put_pixel( mask_image, x, y, 0 );
}
-
+
if ((r == red) && (b == blue) && (g == green))
gdk_image_put_pixel( data_image, x, y, 1 );
- else
+ else
gdk_image_put_pixel( data_image, x, y, 0 );
} // for
bitmap.SetHeight( height );
bitmap.SetWidth( width );
- bitmap.SetPixmap( gdk_pixmap_new( (GdkWindow*)&gdk_root_parent, width, height, -1 ) );
+ bitmap.SetPixmap( gdk_pixmap_new( wxRootWindow->window, width, height, -1 ) );
- // Retrieve depth
+ // Retrieve depth
+
+ GdkVisual *visual = gdk_window_get_visual( wxRootWindow->window );
+ wxASSERT( visual );
- GdkVisual *visual = gdk_window_get_visual( bitmap.GetPixmap() );
- if (visual == NULL) visual = gdk_visual_get_system();
int bpp = visual->depth;
bitmap.SetDepth( bpp );
// Create picture image
GdkImage *data_image =
- gdk_image_new( GDK_IMAGE_FASTEST, gdk_visual_get_system(), width, height );
+ gdk_image_new( GDK_IMAGE_FASTEST, visual, width, height );
// Create mask image
{
unsigned char *mask_data = (unsigned char*)malloc( ((width >> 3)+8) * height );
- mask_image = gdk_image_new_bitmap( gdk_visual_get_system(), mask_data, width, height );
+ mask_image = gdk_image_new_bitmap( visual, mask_data, width, height );
wxMask *mask = new wxMask();
- mask->m_bitmap = gdk_pixmap_new( (GdkWindow*)&gdk_root_parent, width, height, 1 );
+ mask->m_bitmap = gdk_pixmap_new( wxRootWindow->window, width, height, 1 );
bitmap.SetMask( mask );
}
if (bpp >= 24)
{
- GdkVisual *visual = gdk_visual_get_system();
if ((visual->red_mask > visual->green_mask) && (visual->green_mask > visual->blue_mask)) b_o = RGB;
else if ((visual->red_mask > visual->blue_mask) && (visual->blue_mask > visual->green_mask)) b_o = RGB;
else if ((visual->blue_mask > visual->red_mask) && (visual->red_mask > visual->green_mask)) b_o = BRG;
}
int bpp = -1;
+ int red_shift_right = 0;
+ int green_shift_right = 0;
+ int blue_shift_right = 0;
+ int red_shift_left = 0;
+ int green_shift_left = 0;
+ int blue_shift_left = 0;
+ bool use_shift = FALSE;
+
if (bitmap.GetPixmap())
{
GdkVisual *visual = gdk_window_get_visual( bitmap.GetPixmap() );
- if (visual == NULL) visual = gdk_window_get_visual( (GdkWindow*) &gdk_root_parent );
+ if (visual == NULL) visual = gdk_window_get_visual( wxRootWindow->window );
bpp = visual->depth;
- if ((bpp == 16) && (visual->red_mask != 0xf800)) bpp = 15;
+ if (bpp == 16) bpp = visual->red_prec + visual->green_prec + visual->blue_prec;
+ red_shift_right = visual->red_shift;
+ red_shift_left = 8-visual->red_prec;
+ green_shift_right = visual->green_shift;
+ green_shift_left = 8-visual->green_prec;
+ blue_shift_right = visual->blue_shift;
+ blue_shift_left = 8-visual->blue_prec;
+
+ use_shift = (visual->type == GDK_VISUAL_TRUE_COLOR) || (visual->type == GDK_VISUAL_DIRECT_COLOR);
}
if (bitmap.GetBitmap())
{
bpp = 1;
}
+
GdkColormap *cmap = gtk_widget_get_default_colormap();
long pos = 0;
{
for (int i = 0; i < bitmap.GetWidth(); i++)
{
- wxInt32 pixel = gdk_image_get_pixel( gdk_image, i, j );
- if (bpp == 1)
- {
- if (pixel == 0)
- {
- data[pos] = 0;
+ wxUint32 pixel = gdk_image_get_pixel( gdk_image, i, j );
+ if (bpp == 1)
+ {
+ if (pixel == 0)
+ {
+ data[pos] = 0;
data[pos+1] = 0;
data[pos+2] = 0;
- }
- else
- {
- data[pos] = 255;
+ }
+ else
+ {
+ data[pos] = 255;
data[pos+1] = 255;
data[pos+2] = 255;
- }
- } else if (bpp <= 8)
- {
- data[pos] = cmap->colors[pixel].red >> 8;
- data[pos+1] = cmap->colors[pixel].green >> 8;
- data[pos+2] = cmap->colors[pixel].blue >> 8;
- } else if (bpp == 15)
+ }
+ }
+ else if (use_shift)
{
-#if (wxBYTE_ORDER == wxBIG_ENDIAN)
- // ?
-#endif
- data[pos] = (pixel >> 7) & 0xf8;
- data[pos+1] = (pixel >> 2) & 0xf8;
- data[pos+2] = (pixel << 3) & 0xf8;
- } else if (bpp == 16)
+ data[pos] = (pixel >> red_shift_right) << red_shift_left;
+ data[pos+1] = (pixel >> green_shift_right) << green_shift_left;
+ data[pos+2] = (pixel >> blue_shift_right) << blue_shift_left;
+ }
+ else if (cmap->colors)
{
-#if (wxBYTE_ORDER == wxBIG_ENDIAN)
- // ?
-#endif
- data[pos] = (pixel >> 8) & 0xf8;
- data[pos+1] = (pixel >> 3) & 0xfc;
- data[pos+2] = (pixel << 3) & 0xf8;
- } else
+ data[pos] = cmap->colors[pixel].red >> 8;
+ data[pos+1] = cmap->colors[pixel].green >> 8;
+ data[pos+2] = cmap->colors[pixel].blue >> 8;
+ }
+ else
{
-#if (wxBYTE_ORDER == wxBIG_ENDIAN)
- data[pos] = (pixel) & 0xff; // Red
- data[pos+1] = (pixel >> 8) & 0xff; // Green
- data[pos+2] = (pixel >> 16) & 0xff; // Blue
-#else
- data[pos] = (pixel >> 16) & 0xff;
- data[pos+1] = (pixel >> 8) & 0xff;
- data[pos+2] = pixel & 0xff;
-#endif
+ wxFAIL_MSG( wxT("Image conversion failed. Unknown visual type.") );
}
if (gdk_image_mask)
wxSearchColor::wxSearchColor( void )
{
- this->size = 0;
- this->colors = (XColor*) NULL;
- this->color = (unsigned int *) NULL;
- this->entry = (int*) NULL;
+ size = 0;
+ colors = (XColor*) NULL;
+ color = (unsigned int *) NULL;
+ entry = (int*) NULL;
- this->bottom = 0;
- this->top = 0;
+ bottom = 0;
+ top = 0;
}
-wxSearchColor::wxSearchColor( int size, XColor *colors )
+wxSearchColor::wxSearchColor( int size_, XColor *colors_ )
{
int i;
- this->size = size;
- this->colors = colors;
- this->color = new unsigned int[size];
- this->entry = new int [size];
+ size = size_;
+ colors = colors_;
+ color = new unsigned int[size];
+ entry = new int [size];
- for (i = 0; i < this->size; i++ ) {
- this->entry[i] = -1;
- }
+ for (i = 0; i < size; i++ ) {
+ entry[i] = -1;
+ }
- this->bottom = this->top = ( size >> 1 );
+ bottom = top = ( size >> 1 );
}
wxSearchColor::~wxSearchColor( void )
{
- if ( this->color ) delete this->color;
- if ( this->entry ) delete this->entry;
+ if ( color ) delete color;
+ if ( entry ) delete entry;
}
int wxSearchColor::SearchColor( int r, int g, int b )
{
unsigned int value = ( ( ( r * 256 ) + g ) * 256 ) + b;
- int begin = this->bottom;
- int end = this->top;
+ int begin = bottom;
+ int end = top;
int middle;
while ( begin <= end ) {
middle = ( begin + end ) >> 1;
- if ( value == this->color[middle] ) {
- return( this->entry[middle] );
- } else if ( value < this->color[middle] ) {
+ if ( value == color[middle] ) {
+ return( entry[middle] );
+ } else if ( value < color[middle] ) {
end = middle - 1;
} else {
begin = middle + 1;
if (sum < max) { pixel = i; max = sum; }
}
- if ( this->entry[pos] < 0 ) {
- this->color[pos] = value;
- this->entry[pos] = pixel;
- } else if ( value < this->color[pos] ) {
+ if ( entry[pos] < 0 ) {
+ color[pos] = value;
+ entry[pos] = pixel;
+ } else if ( value < color[pos] ) {
- if ( this->bottom > 0 ) {
- for ( i = this->bottom; i < pos; i++ ) {
- this->color[i-1] = this->color[i];
- this->entry[i-1] = this->entry[i];
+ if ( bottom > 0 ) {
+ for ( i = bottom; i < pos; i++ ) {
+ color[i-1] = color[i];
+ entry[i-1] = entry[i];
}
- this->bottom--;
- this->color[pos-1] = value;
- this->entry[pos-1] = pixel;
- } else if ( this->top < this->size-1 ) {
- for ( i = this->top; i >= pos; i-- ) {
- this->color[i+1] = this->color[i];
- this->entry[i+1] = this->entry[i];
+ bottom--;
+ color[pos-1] = value;
+ entry[pos-1] = pixel;
+ } else if ( top < size-1 ) {
+ for ( i = top; i >= pos; i-- ) {
+ color[i+1] = color[i];
+ entry[i+1] = entry[i];
}
- this->top++;
- this->color[pos] = value;
- this->entry[pos] = pixel;
+ top++;
+ color[pos] = value;
+ entry[pos] = pixel;
}
} else {
- if ( this->top < this->size-1 ) {
- for ( i = this->top; i > pos; i-- ) {
- this->color[i+1] = this->color[i];
- this->entry[i+1] = this->entry[i];
+ if ( top < size-1 ) {
+ for ( i = top; i > pos; i-- ) {
+ color[i+1] = color[i];
+ entry[i+1] = entry[i];
}
- this->top++;
- this->color[pos+1] = value;
- this->entry[pos+1] = pixel;
- } else if ( this->bottom > 0 ) {
- for ( i = this->bottom; i < pos; i++ ) {
- this->color[i-1] = this->color[i];
- this->entry[i-1] = this->entry[i];
+ top++;
+ color[pos+1] = value;
+ entry[pos+1] = pixel;
+ } else if ( bottom > 0 ) {
+ for ( i = bottom; i < pos; i++ ) {
+ color[i-1] = color[i];
+ entry[i-1] = entry[i];
}
- this->bottom--;
- this->color[pos] = value;
- this->entry[pos] = pixel;
+ bottom--;
+ color[pos] = value;
+ entry[pos] = pixel;
}
}
*/
#endif
- // And this is all to get the 'right' color...
- int pixel = scolor.SearchColor( r, g, b );
+ // And this is all to get the 'right' color...
+ int pixel = scolor.SearchColor( r, g, b );
XPutPixel( data_image, x, y, pixel );
break;
}
unsigned long wxImage::CountColours( unsigned long stopafter )
{
wxHashTable h;
- wxNode *node;
- wxHNode *hnode;
+ wxObject dummy;
unsigned char r, g, b, *p;
unsigned long size, nentries, key;
b = *(p++);
key = (r << 16) | (g << 8) | b;
- hnode = (wxHNode *) h.Get(key);
-
- if (!hnode)
+ if (h.Get(key) == NULL)
{
- h.Put(key, (wxObject *)(new wxHNode));
+ h.Put(key, &dummy);
nentries++;
}
}
- // delete all HNodes
- h.BeginFind();
- while ((node = h.Next()) != NULL)
- delete (wxHNode *)node->GetData();
-
return nentries;
}
return nentries;
}
+/*
+ * Rotation code by Carlos Moreno
+ */
+
+// GRG: I've removed wxRotationPoint - we already have wxRealPoint which
+// does exactly the same thing. And I also got rid of wxRotationPixel
+// bacause of potential problems in architectures where alignment
+// is an issue, so I had to rewrite parts of the code.
+
+static const double gs_Epsilon = 1e-10;
+
+static inline int wxCint (double x)
+{
+ return (x > 0) ? (int) (x + 0.5) : (int) (x - 0.5);
+}
+
+
+// Auxiliary function to rotate a point (x,y) with respect to point p0
+// make it inline and use a straight return to facilitate optimization
+// also, the function receives the sine and cosine of the angle to avoid
+// repeating the time-consuming calls to these functions -- sin/cos can
+// be computed and stored in the calling function.
+
+inline wxRealPoint rotated_point (const wxRealPoint & p, double cos_angle, double sin_angle, const wxRealPoint & p0)
+{
+ return wxRealPoint (p0.x + (p.x - p0.x) * cos_angle - (p.y - p0.y) * sin_angle,
+ p0.y + (p.y - p0.y) * cos_angle + (p.x - p0.x) * sin_angle);
+}
+
+inline wxRealPoint rotated_point (double x, double y, double cos_angle, double sin_angle, const wxRealPoint & p0)
+{
+ return rotated_point (wxRealPoint(x,y), cos_angle, sin_angle, p0);
+}
+
+wxImage wxImage::Rotate(double angle, const wxPoint & centre_of_rotation, bool interpolating, wxPoint * offset_after_rotation) const
+{
+ int i;
+ angle = -angle; // screen coordinates are a mirror image of "real" coordinates
+
+ // Create pointer-based array to accelerate access to wxImage's data
+ unsigned char ** data = new unsigned char * [GetHeight()];
+
+ data[0] = GetData();
+
+ for (i = 1; i < GetHeight(); i++)
+ data[i] = data[i - 1] + (3 * GetWidth());
+
+ // precompute coefficients for rotation formula
+ // (sine and cosine of the angle)
+ const double cos_angle = cos(angle);
+ const double sin_angle = sin(angle);
+
+ // Create new Image to store the result
+ // First, find rectangle that covers the rotated image; to do that,
+ // rotate the four corners
+
+ const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
+
+ wxRealPoint p1 = rotated_point (0, 0, cos_angle, sin_angle, p0);
+ wxRealPoint p2 = rotated_point (0, GetHeight(), cos_angle, sin_angle, p0);
+ wxRealPoint p3 = rotated_point (GetWidth(), 0, cos_angle, sin_angle, p0);
+ wxRealPoint p4 = rotated_point (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
+
+ int x1 = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
+ int y1 = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
+ int x2 = (int) ceil (wxMax (wxMax(p1.x, p2.x), wxMax(p3.x, p4.x)));
+ int y2 = (int) ceil (wxMax (wxMax(p1.y, p2.y), wxMax(p3.y, p4.y)));
+
+ wxImage rotated (x2 - x1 + 1, y2 - y1 + 1);
+
+ if (offset_after_rotation != NULL)
+ {
+ *offset_after_rotation = wxPoint (x1, y1);
+ }
+
+ // GRG: The rotated (destination) image is always accessed
+ // sequentially, so there is no need for a pointer-based
+ // array here (and in fact it would be slower).
+ //
+ unsigned char * dst = rotated.GetData();
+
+ // GRG: if the original image has a mask, use its RGB values
+ // as the blank pixel, else, fall back to default (black).
+ //
+ unsigned char blank_r = 0;
+ unsigned char blank_g = 0;
+ unsigned char blank_b = 0;
+
+ if (HasMask())
+ {
+ blank_r = GetMaskRed();
+ blank_g = GetMaskGreen();
+ blank_b = GetMaskBlue();
+ rotated.SetMaskColour( blank_r, blank_g, blank_b );
+ }
+
+ // Now, for each point of the rotated image, find where it came from, by
+ // performing an inverse rotation (a rotation of -angle) and getting the
+ // pixel at those coordinates
+
+ // GRG: I've taken the (interpolating) test out of the loops, so that
+ // it is done only once, instead of repeating it for each pixel.
+
+ int x;
+ if (interpolating)
+ {
+ for (int y = 0; y < rotated.GetHeight(); y++)
+ {
+ for (x = 0; x < rotated.GetWidth(); x++)
+ {
+ wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+
+ if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
+ -0.25 < src.y && src.y < GetHeight() - 0.75)
+ {
+ // interpolate using the 4 enclosing grid-points. Those
+ // points can be obtained using floor and ceiling of the
+ // exact coordinates of the point
+ // C.M. 2000-02-17: when the point is near the border, special care is required.
+
+ int x1, y1, x2, y2;
+
+ if (0 < src.x && src.x < GetWidth() - 1)
+ {
+ x1 = wxCint(floor(src.x));
+ x2 = wxCint(ceil(src.x));
+ }
+ else // else means that x is near one of the borders (0 or width-1)
+ {
+ x1 = x2 = wxCint (src.x);
+ }
+
+ if (0 < src.y && src.y < GetHeight() - 1)
+ {
+ y1 = wxCint(floor(src.y));
+ y2 = wxCint(ceil(src.y));
+ }
+ else
+ {
+ y1 = y2 = wxCint (src.y);
+ }
+
+ // get four points and the distances (square of the distance,
+ // for efficiency reasons) for the interpolation formula
+
+ // GRG: Do not calculate the points until they are
+ // really needed -- this way we can calculate
+ // just one, instead of four, if d1, d2, d3
+ // or d4 are < gs_Epsilon
+
+ const double d1 = (src.x - x1) * (src.x - x1) + (src.y - y1) * (src.y - y1);
+ const double d2 = (src.x - x2) * (src.x - x2) + (src.y - y1) * (src.y - y1);
+ const double d3 = (src.x - x2) * (src.x - x2) + (src.y - y2) * (src.y - y2);
+ const double d4 = (src.x - x1) * (src.x - x1) + (src.y - y2) * (src.y - y2);
+
+ // Now interpolate as a weighted average of the four surrounding
+ // points, where the weights are the distances to each of those points
+
+ // If the point is exactly at one point of the grid of the source
+ // image, then don't interpolate -- just assign the pixel
+
+ if (d1 < gs_Epsilon) // d1,d2,d3,d4 are positive -- no need for abs()
+ {
+ unsigned char *p = data[y1] + (3 * x1);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ }
+ else if (d2 < gs_Epsilon)
+ {
+ unsigned char *p = data[y1] + (3 * x2);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ }
+ else if (d3 < gs_Epsilon)
+ {
+ unsigned char *p = data[y2] + (3 * x2);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ }
+ else if (d4 < gs_Epsilon)
+ {
+ unsigned char *p = data[y2] + (3 * x1);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ }
+ else
+ {
+ // weights for the weighted average are proportional to the inverse of the distance
+ unsigned char *v1 = data[y1] + (3 * x1);
+ unsigned char *v2 = data[y1] + (3 * x2);
+ unsigned char *v3 = data[y2] + (3 * x2);
+ unsigned char *v4 = data[y2] + (3 * x1);
+
+ const double w1 = 1/d1, w2 = 1/d2, w3 = 1/d3, w4 = 1/d4;
+
+ // GRG: Unrolled.
+
+ *(dst++) = (unsigned char)
+ ( (w1 * *(v1++) + w2 * *(v2++) +
+ w3 * *(v3++) + w4 * *(v4++)) /
+ (w1 + w2 + w3 + w4) );
+ *(dst++) = (unsigned char)
+ ( (w1 * *(v1++) + w2 * *(v2++) +
+ w3 * *(v3++) + w4 * *(v4++)) /
+ (w1 + w2 + w3 + w4) );
+ *(dst++) = (unsigned char)
+ ( (w1 * *(v1++) + w2 * *(v2++) +
+ w3 * *(v3++) + w4 * *(v4++)) /
+ (w1 + w2 + w3 + w4) );
+ }
+ }
+ else
+ {
+ *(dst++) = blank_r;
+ *(dst++) = blank_g;
+ *(dst++) = blank_b;
+ }
+ }
+ }
+ }
+ else // not interpolating
+ {
+ for (int y = 0; y < rotated.GetHeight(); y++)
+ {
+ for (x = 0; x < rotated.GetWidth(); x++)
+ {
+ wxRealPoint src = rotated_point (x + x1, y + y1, cos_angle, -sin_angle, p0);
+
+ const int xs = wxCint (src.x); // wxCint rounds to the
+ const int ys = wxCint (src.y); // closest integer
+
+ if (0 <= xs && xs < GetWidth() &&
+ 0 <= ys && ys < GetHeight())
+ {
+ unsigned char *p = data[ys] + (3 * xs);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ *(dst++) = *(p++);
+ }
+ else
+ {
+ *(dst++) = blank_r;
+ *(dst++) = blank_g;
+ *(dst++) = blank_b;
+ }
+ }
+ }
+ }
+
+ delete [] data;
+
+ return rotated;
+}
projects / wxWidgets.git / blobdiff