unsigned char* dst_alpha = NULL;
// Check for a mask or alpha
- if ( M_IMGDATA->m_hasMask )
+ if ( src_alpha )
+ {
+ ret_image.SetAlpha();
+ dst_alpha = ret_image.GetAlpha();
+ }
+ else if ( M_IMGDATA->m_hasMask )
{
ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
M_IMGDATA->m_maskGreen,
M_IMGDATA->m_maskBlue);
}
- else
- {
- if ( src_alpha )
- {
- ret_image.SetAlpha();
- dst_alpha = ret_image.GetAlpha();
- }
- }
// number of pixels we average over
const int blurArea = blurRadius*2 + 1;
unsigned char* dst_alpha = NULL;
// Check for a mask or alpha
- if ( M_IMGDATA->m_hasMask )
+ if ( src_alpha )
+ {
+ ret_image.SetAlpha();
+ dst_alpha = ret_image.GetAlpha();
+ }
+ else if ( M_IMGDATA->m_hasMask )
{
ret_image.SetMaskColour(M_IMGDATA->m_maskRed,
M_IMGDATA->m_maskGreen,
M_IMGDATA->m_maskBlue);
}
- else
- {
- if ( src_alpha )
- {
- ret_image.SetAlpha();
- dst_alpha = ret_image.GetAlpha();
- }
- }
// number of pixels we average over
const int blurArea = blurRadius*2 + 1;
return wxRotatePoint (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
+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
+ // screen coordinates are a mirror image of "real" coordinates
+ angle = -angle;
- bool has_alpha = HasAlpha();
+ const bool has_alpha = HasAlpha();
+
+ const int w = GetWidth();
+ const int h = GetHeight();
+
+ int i;
// Create pointer-based array to accelerate access to wxImage's data
- unsigned char ** data = new unsigned char * [GetHeight()];
+ unsigned char ** data = new unsigned char * [h];
data[0] = GetData();
- for (i = 1; i < GetHeight(); i++)
- data[i] = data[i - 1] + (3 * GetWidth());
+ for (i = 1; i < h; i++)
+ data[i] = data[i - 1] + (3 * w);
// Same for alpha channel
unsigned char ** alpha = NULL;
if (has_alpha)
{
- alpha = new unsigned char * [GetHeight()];
+ alpha = new unsigned char * [h];
alpha[0] = GetAlpha();
- for (i = 1; i < GetHeight(); i++)
- alpha[i] = alpha[i - 1] + GetWidth();
+ for (i = 1; i < h; i++)
+ alpha[i] = alpha[i - 1] + w;
}
// precompute coefficients for rotation formula
- // (sine and cosine of the angle)
const double cos_angle = cos(angle);
const double sin_angle = sin(angle);
const wxRealPoint p0(centre_of_rotation.x, centre_of_rotation.y);
wxRealPoint p1 = wxRotatePoint (0, 0, cos_angle, sin_angle, p0);
- wxRealPoint p2 = wxRotatePoint (0, GetHeight(), cos_angle, sin_angle, p0);
- wxRealPoint p3 = wxRotatePoint (GetWidth(), 0, cos_angle, sin_angle, p0);
- wxRealPoint p4 = wxRotatePoint (GetWidth(), GetHeight(), cos_angle, sin_angle, p0);
+ wxRealPoint p2 = wxRotatePoint (0, h, cos_angle, sin_angle, p0);
+ wxRealPoint p3 = wxRotatePoint (w, 0, cos_angle, sin_angle, p0);
+ wxRealPoint p4 = wxRotatePoint (w, h, cos_angle, sin_angle, p0);
int x1a = (int) floor (wxMin (wxMin(p1.x, p2.x), wxMin(p3.x, p4.x)));
int y1a = (int) floor (wxMin (wxMin(p1.y, p2.y), wxMin(p3.y, p4.y)));
*offset_after_rotation = wxPoint (x1a, y1a);
}
- // 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();
+ // the rotated (destination) image is always accessed sequentially via this
+ // pointer, there is no need for pointer-based arrays here
+ unsigned char *dst = rotated.GetData();
- unsigned char * alpha_dst = NULL;
- if (has_alpha)
- alpha_dst = rotated.GetAlpha();
+ unsigned char *alpha_dst = has_alpha ? rotated.GetAlpha() : NULL;
- // GRG: if the original image has a mask, use its RGB values
- // as the blank pixel, else, fall back to default (black).
- //
+ // 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;
// 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.
+ const int rH = rotated.GetHeight();
+ const int rW = rotated.GetWidth();
- int x;
+ // do the (interpolating) test outside of the loops, so that it is done
+ // only once, instead of repeating it for each pixel.
if (interpolating)
{
- for (int y = 0; y < rotated.GetHeight(); y++)
+ for (int y = 0; y < rH; y++)
{
- for (x = 0; x < rotated.GetWidth(); x++)
+ for (int x = 0; x < rW; x++)
{
wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
- if (-0.25 < src.x && src.x < GetWidth() - 0.75 &&
- -0.25 < src.y && src.y < GetHeight() - 0.75)
+ if (-0.25 < src.x && src.x < w - 0.75 &&
+ -0.25 < src.y && src.y < h - 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
int x1, y1, x2, y2;
- if (0 < src.x && src.x < GetWidth() - 1)
+ if (0 < src.x && src.x < w - 1)
{
x1 = wxRound(floor(src.x));
x2 = wxRound(ceil(src.x));
x1 = x2 = wxRound (src.x);
}
- if (0 < src.y && src.y < GetHeight() - 1)
+ if (0 < src.y && src.y < h - 1)
{
y1 = wxRound(floor(src.y));
y2 = wxRound(ceil(src.y));
}
}
}
- else // not interpolating
+ else // not interpolating
{
- for (int y = 0; y < rotated.GetHeight(); y++)
+ for (int y = 0; y < rH; y++)
{
- for (x = 0; x < rotated.GetWidth(); x++)
+ for (int x = 0; x < rW; x++)
{
wxRealPoint src = wxRotatePoint (x + x1a, y + y1a, cos_angle, -sin_angle, p0);
const int xs = wxRound (src.x); // wxRound rounds to the
const int ys = wxRound (src.y); // closest integer
- if (0 <= xs && xs < GetWidth() &&
- 0 <= ys && ys < GetHeight())
+ if (0 <= xs && xs < w && 0 <= ys && ys < h)
{
unsigned char *p = data[ys] + (3 * xs);
*(dst++) = *(p++);
}
delete [] data;
-
- if (has_alpha)
- delete [] alpha;
+ delete [] alpha;
return rotated;
}
projects / wxWidgets.git / blobdiff