+//---------------------------------------------------------------------------
+// Factory functions for creating wxBitmaps from Python buffer objects. They
+// use the Abstract Pixel API to be able to set RGB and A bytes directly into
+// the wxBitmap's pixel buffer.
+
+%{
+// See http://tinyurl.com/e5adr for what premultiplying alpha means. It
+// appears to me that the other platforms are already doing it, so I'll just
+// automatically do it for wxMSW here.
+#ifdef __WXMSW__
+#define wxPy_premultiply(p, a) ((p) * (a) / 0xff)
+#define wxPy_unpremultiply(p, a) ((a) ? ((p) * 0xff / (a)) : (p))
+#else
+#define wxPy_premultiply(p, a) (p)
+#define wxPy_unpremultiply(p, a) (p)
+#endif
+%}
+
+
+%newobject _BitmapFromBufferAlpha;
+%newobject _BitmapFromBuffer;
+%inline %{
+ wxBitmap* _BitmapFromBufferAlpha(int width, int height,
+ buffer data, int DATASIZE,
+ buffer alpha, int ALPHASIZE)
+ {
+ if (DATASIZE != width*height*3) {
+ wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
+ return NULL;
+ }
+
+ if (ALPHASIZE != width*height) {
+ wxPyErr_SetString(PyExc_ValueError, "Invalid alpha buffer size.");
+ return NULL;
+ }
+
+ wxBitmap* bmp = new wxBitmap(width, height, 32);
+ wxAlphaPixelData pixData(*bmp, wxPoint(0,0), wxSize(width,height));
+ if (! pixData) {
+ // raise an exception...
+ wxPyErr_SetString(PyExc_RuntimeError,
+ "Failed to gain raw access to bitmap data.");
+ return NULL;
+ }
+
+ pixData.UseAlpha();
+ wxAlphaPixelData::Iterator p(pixData);
+ for (int y=0; y<height; y++) {
+ wxAlphaPixelData::Iterator rowStart = p;
+ for (int x=0; x<width; x++) {
+ byte a = *(alpha++);
+ p.Red() = wxPy_premultiply(*(data++), a);
+ p.Green() = wxPy_premultiply(*(data++), a);
+ p.Blue() = wxPy_premultiply(*(data++), a);
+ p.Alpha() = a;
+ ++p;
+ }
+ p = rowStart;
+ p.OffsetY(pixData, 1);
+ }
+ return bmp;
+ }
+
+ wxBitmap* _BitmapFromBuffer(int width, int height, buffer data, int DATASIZE)
+ {
+ if (DATASIZE != width*height*3) {
+ wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
+ return NULL;
+ }
+
+ wxBitmap* bmp = new wxBitmap(width, height, 24);
+ wxNativePixelData pixData(*bmp, wxPoint(0,0), wxSize(width,height));
+ if (! pixData) {
+ // raise an exception...
+ wxPyErr_SetString(PyExc_RuntimeError,
+ "Failed to gain raw access to bitmap data.");
+ return NULL;
+ }
+
+ wxNativePixelData::Iterator p(pixData);
+ for (int y=0; y<height; y++) {
+ wxNativePixelData::Iterator rowStart = p;
+ for (int x=0; x<width; x++) {
+ p.Red() = *(data++);
+ p.Green() = *(data++);
+ p.Blue() = *(data++);
+ ++p;
+ }
+ p = rowStart;
+ p.OffsetY(pixData, 1);
+ }
+ return bmp;
+ }
+%}
+
+
+%pythoncode {
+def BitmapFromBuffer(width, height, dataBuffer, alphaBuffer=None):
+ """
+ Creates a `wx.Bitmap` from the data in dataBuffer. The dataBuffer
+ parameter must be a Python object that implements the buffer
+ interface, such as a string, array, etc. The dataBuffer object is
+ expected to contain a series of RGB bytes and be width*height*3
+ bytes long. A buffer object can optionally be supplied for the
+ image's alpha channel data, and it is expected to be width*height
+ bytes long. On Windows the RGB values are 'premultiplied' by the
+ alpha values. (The other platforms do the multiplication
+ themselves.)
+
+ Unlike `wx.ImageFromBuffer` the bitmap created with this function
+ does not share the memory buffer with the buffer object. This is
+ because the native pixel buffer format varies on different
+ platforms, and so instead an efficient as possible copy of the
+ data is made from the buffer objects to the bitmap's native pixel
+ buffer. For direct access to a bitmap's pixel buffer see
+ `wx.NativePixelData` and `wx.AlphaPixelData`.
+
+ :see: `wx.Bitmap`, `wx.BitmapFromBufferRGBA`, `wx.NativePixelData`,
+ `wx.AlphaPixelData`, `wx.ImageFromBuffer`
+ """
+ if alphaBuffer is not None:
+ return _gdi_._BitmapFromBufferAlpha(width, height, dataBuffer, alphaBuffer)
+ else:
+ return _gdi_._BitmapFromBuffer(width, height, dataBuffer)
+}
+
+
+
+%newobject _BitmapFromBufferRGBA;
+%inline %{
+ wxBitmap* _BitmapFromBufferRGBA(int width, int height, buffer data, int DATASIZE)
+ {
+ if (DATASIZE != width*height*4) {
+ wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
+ return NULL;
+ }
+
+ wxBitmap* bmp = new wxBitmap(width, height, 32);
+ wxAlphaPixelData pixData(*bmp, wxPoint(0,0), wxSize(width,height));
+ if (! pixData) {
+ // raise an exception...
+ wxPyErr_SetString(PyExc_RuntimeError,
+ "Failed to gain raw access to bitmap data.");
+ return NULL;
+ }
+
+ pixData.UseAlpha();
+ wxAlphaPixelData::Iterator p(pixData);
+ for (int y=0; y<height; y++) {
+ wxAlphaPixelData::Iterator rowStart = p;
+ for (int x=0; x<width; x++) {
+ byte a = data[3];
+ p.Red() = wxPy_premultiply(*(data++), a);
+ p.Green() = wxPy_premultiply(*(data++), a);
+ p.Blue() = wxPy_premultiply(*(data++), a);
+ p.Alpha() = a; data++;
+ ++p;
+ }
+ p = rowStart;
+ p.OffsetY(pixData, 1);
+ }
+ return bmp;
+ }
+%}
+
+%pythoncode {
+def BitmapFromBufferRGBA(width, height, dataBuffer):
+ """
+ Creates a `wx.Bitmap` from the data in dataBuffer. The dataBuffer
+ parameter must be a Python object that implements the buffer
+ interface, such as a string, array, etc. The dataBuffer object is
+ expected to contain a series of RGBA bytes (red, green, blue and
+ alpha) and be width*height*4 bytes long. On Windows the RGB
+ values are 'premultiplied' by the alpha values. (The other
+ platforms do the multiplication themselves.)
+
+ Unlike `wx.ImageFromBuffer` the bitmap created with this function
+ does not share the memory buffer with the buffer object. This is
+ because the native pixel buffer format varies on different
+ platforms, and so instead an efficient as possible copy of the
+ data is made from the buffer object to the bitmap's native pixel
+ buffer. For direct access to a bitmap's pixel buffer see
+ `wx.NativePixelData` and `wx.AlphaPixelData`.
+
+ :see: `wx.Bitmap`, `wx.BitmapFromBuffer`, `wx.NativePixelData`,
+ `wx.AlphaPixelData`, `wx.ImageFromBuffer`
+ """
+ return _gdi_._BitmapFromBufferRGBA(width, height, dataBuffer)
+}
+
+
+//---------------------------------------------------------------------------
+
+class wxPixelDataBase
+{
+public:
+ // origin of the rectangular region we represent
+ wxPoint GetOrigin() const { return m_ptOrigin; }
+
+ // width and height of the region we represent
+ int GetWidth() const { return m_width; }
+ int GetHeight() const { return m_height; }
+
+ wxSize GetSize() const { return wxSize(m_width, m_height); }
+
+ // the distance between two rows
+ int GetRowStride() const { return m_stride; }
+
+ %property(Height, GetHeight, doc="See `GetHeight`");
+ %property(Origin, GetOrigin, doc="See `GetOrigin`");
+ %property(RowStride, GetRowStride, doc="See `GetRowStride`");
+ %property(Size, GetSize, doc="See `GetSize`");
+ %property(Width, GetWidth, doc="See `GetWidth`");
+};
+
+
+// Both wxNativePixelData and wxAlphaPixelData have the same interface, so
+// make a macro to declare them both.
+
+%define PIXELDATA(PixelData)
+%{
+ typedef PixelData##::Iterator PixelData##_Accessor;
+%}
+class PixelData##_Accessor;
+class PixelData : public wxPixelDataBase
+{
+public:
+ %nokwargs PixelData;
+
+ PixelData(wxBitmap& bmp);
+ PixelData(wxBitmap& bmp, const wxRect& rect);
+ PixelData(wxBitmap& bmp, const wxPoint& pt, const wxSize& sz);
+
+ ~PixelData();
+
+ PixelData##_Accessor GetPixels() const;
+ void UseAlpha();
+
+ %extend {
+ bool __nonzero__() { return self->operator bool(); }
+ }
+
+ %pythoncode {
+ def __iter__(self):
+ """
+ Create and return an iterator object for this pixel data
+ object. (It's really a generator but I won't tell if you
+ don't tell.)
+ """
+ width = self.GetWidth()
+ height = self.GetHeight()
+ pixels = self.GetPixels()
+
+ # This class is a facade over the pixels object (using the one
+ # in the enclosing scope) that only allows Get() and Set() to
+ # be called.
+ class PixelFacade(object):
+ def Get(self):
+ return pixels.Get()
+ def Set(self, *args, **kw):
+ return pixels.Set(*args, **kw)
+ def __str__(self):
+ return str(self.Get())
+ def __repr__(self):
+ return 'pixel(%d,%d): %s' % (x,y,self.Get())
+ X = property(lambda self: x)
+ Y = property(lambda self: y)
+
+ pf = PixelFacade()
+ for y in xrange(height):
+ for x in xrange(width):
+ # We always generate the same pf instance, but it
+ # accesses the pixels object which we use to iterate
+ # over the pixel buffer.
+ yield pf
+ pixels.nextPixel()
+ pixels.MoveTo(self, 0, y)
+ }
+
+ %property(Pixels, GetPixels, doc="See `GetPixels`");
+};
+
+
+
+class PixelData##_Accessor
+{
+public:
+ %nokwargs PixelData##_Accessor;
+
+ PixelData##_Accessor(PixelData& data);
+ PixelData##_Accessor(wxBitmap& bmp, PixelData& data);
+ PixelData##_Accessor();
+
+ ~PixelData##_Accessor();
+
+ void Reset(const PixelData& data);
+ bool IsOk() const;
+
+ %extend {
+ // PixelData##_Accessor& nextPixel() { return ++(*self); }
+ void nextPixel() { ++(*self); }
+ }
+
+ void Offset(const PixelData& data, int x, int y);
+ void OffsetX(const PixelData& data, int x);
+ void OffsetY(const PixelData& data, int y);
+ void MoveTo(const PixelData& data, int x, int y);
+
+// NOTE: For now I'm not wrapping the Red, Green, Blue and Alpha
+// functions because I can't hide the premultiplying needed on wxMSW
+// if only the individual components are wrapped, plus it would mean 3
+// or 4 trips per pixel from Python to C++ instead of just one.
+// Instead I've added the Set and Get functions and put the
+// premultiplying in there.
+
+// %extend {
+// byte _get_Red() { return self->Red(); }
+// byte _get_Green() { return self->Green(); }
+// byte _get_Blue() { return self->Blue(); }
+
+// void _set_Red(byte val) { self->Red() = val; }
+// void _set_Green(byte val) { self->Green() = val; }
+// void _set_Blue(byte val) { self->Blue() = val; }
+// }
+
+// %pythoncode {
+// Red = property(_get_Red, _set_Red)
+// Green = property(_get_Green, _set_Green)
+// Blue = property(_get_Blue, _set_Blue)
+// }
+};
+%enddef
+
+
+%pythonAppend wxAlphaPixelData::wxAlphaPixelData "self.UseAlpha()"
+
+// Make the classes
+PIXELDATA(wxNativePixelData)
+PIXELDATA(wxAlphaPixelData)
+
+
+// Add in a few things that are different between the wxNativePixelData and
+// wxAlphaPixelData and the iterator classes and so are not included in our
+// macro...
+
+%extend wxNativePixelData_Accessor {
+ void Set(byte red, byte green, byte blue) {
+ self->Red() = red;
+ self->Green() = green;
+ self->Blue() = blue;
+ }
+
+ PyObject* Get() {
+ PyObject* rv = PyTuple_New(3);
+ PyTuple_SetItem(rv, 0, PyInt_FromLong(self->Red()));
+ PyTuple_SetItem(rv, 1, PyInt_FromLong(self->Green()));
+ PyTuple_SetItem(rv, 2, PyInt_FromLong(self->Blue()));
+ return rv;
+ }
+}
+
+%extend wxAlphaPixelData_Accessor {
+// byte _get_Alpha() { return self->Alpha(); }
+// void _set_Alpha(byte val) { self->Alpha() = val; }
+
+// %pythoncode {
+// Alpha = property(_get_Alpha, _set_Alpha)
+// }
+
+ void Set(byte red, byte green, byte blue, byte alpha) {
+ self->Red() = wxPy_premultiply(red, alpha);
+ self->Green() = wxPy_premultiply(green, alpha);
+ self->Blue() = wxPy_premultiply(blue, alpha);
+ self->Alpha() = alpha;
+ }
+
+ PyObject* Get() {
+ PyObject* rv = PyTuple_New(4);
+ int red = self->Red();
+ int green = self->Green();
+ int blue = self->Blue();
+ int alpha = self->Alpha();
+
+ PyTuple_SetItem(rv, 0, PyInt_FromLong( wxPy_unpremultiply(red, alpha) ));
+ PyTuple_SetItem(rv, 1, PyInt_FromLong( wxPy_unpremultiply(green, alpha) ));
+ PyTuple_SetItem(rv, 2, PyInt_FromLong( wxPy_unpremultiply(blue, alpha) ));
+ PyTuple_SetItem(rv, 3, PyInt_FromLong( alpha ));
+ return rv;
+ }
+}
+
+
projects / wxWidgets.git / blobdiff