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bitmap_ex.cpp
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bitmap_ex.cpp
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//--------------------------------------------------------------------------
// Name: src/bitmap_ex.h
// Purpose: Helper functions and etc. for copying bitmap data to/from
// buffer objects. This file is included in etg/bitmap.py and
// used in the wxBitmap wrapper.
//
// Author: Robin Dunn
//
// Created: 27-Apr-2012
// Copyright: (c) 2012-2017 by Total Control Software
// Licence: wxWindows license
//--------------------------------------------------------------------------
#include <wx/rawbmp.h>
// TODO: Switch these APIs to use the new wxPyBuffer class
void wxPyCopyBitmapFromBuffer(wxBitmap* bmp,
buffer data, Py_ssize_t DATASIZE,
wxBitmapBufferFormat format, int stride)
{
int height = bmp->GetHeight();
int width = bmp->GetWidth();
switch (format) {
// A simple sequence of RGB bytes
case wxBitmapBufferFormat_RGB:
{
if (DATASIZE < width * height * 3) {
wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
return;
}
wxNativePixelData pixData(*bmp, wxPoint(0,0), wxSize(width, height));
if (! pixData) {
wxPyErr_SetString(PyExc_RuntimeError,
"Failed to gain raw access to bitmap data.");
return;
}
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);
}
break;
}
// A simple sequence of RGBA bytes
case wxBitmapBufferFormat_RGBA:
{
if (DATASIZE < width * height * 4) {
wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
return;
}
wxAlphaPixelData pixData(*bmp, wxPoint(0,0), wxSize(width, height));
if (! pixData) {
wxPyErr_SetString(PyExc_RuntimeError,
"Failed to gain raw access to bitmap data.");
return;
}
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);
}
break;
}
// A sequence of 32-bit values in native endian order,
// where the alpha is in the upper 8 bits, then red, then
// green, then blue. The stride is the distance in bytes
// from the beginning of one row of the image data to the
// beginning of the next row. This may not be the same as
// width*4 if alignment or platform specific optimizations
// have been utilized.
// NOTE: This is normally used with Cairo, which seems to
// already have the values premultiplied. Should we have
// a way to optionally do it anyway?
case wxBitmapBufferFormat_RGB32:
case wxBitmapBufferFormat_ARGB32:
{
bool useAlpha = (format == wxBitmapBufferFormat_ARGB32);
byte* rowStart = data;
wxUint32* bufptr;
wxUint32 value;
if (stride == -1)
stride = width * 4;
if (DATASIZE < stride * height) {
wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size.");
return;
}
wxAlphaPixelData pixData(*bmp, wxPoint(0,0), wxSize(width,height));
if (! pixData) {
wxPyErr_SetString(PyExc_RuntimeError,
"Failed to gain raw access to bitmap data.");
return;
}
wxAlphaPixelData::Iterator pix(pixData);
for (int y=0; y<height; y++) {
pix.MoveTo(pixData, 0, y);
bufptr = (wxUint32*)rowStart;
for (int x=0; x<width; x++) {
value = *bufptr;
pix.Alpha() = useAlpha ? (value >> 24) & 0xFF : 255;
pix.Red() = (value >> 16) & 0xFF;
pix.Green() = (value >> 8) & 0xFF;
pix.Blue() = (value >> 0) & 0xFF;
++pix;
++bufptr;
}
rowStart += stride;
}
break;
}
}
}
// Some helper macros used below to help declutter the code
#define MAKE_PIXDATA(type) \
type pixData(*bmp, wxPoint(0,0), wxSize(width, height)); \
if (! pixData) { \
wxPyErr_SetString(PyExc_RuntimeError, "Failed to gain raw access to bitmap data."); \
return; \
} \
type::Iterator p(pixData); \
type::Iterator rowStart
#define CHECK_BUFFERSIZE(size_needed) \
if (DATASIZE < size_needed) { \
wxPyErr_SetString(PyExc_ValueError, "Invalid data buffer size."); \
return; \
}
void wxPyCopyBitmapToBuffer(wxBitmap* bmp,
buffer data, Py_ssize_t DATASIZE,
wxBitmapBufferFormat format, int stride)
{
int height = bmp->GetHeight();
int width = bmp->GetWidth();
int depth = bmp->GetDepth();
// images loaded from a file may not have set the depth, at least on Mac...
if (depth == -1) {
if (bmp->HasAlpha())
depth = 32;
else
depth = 24;
}
switch (format) {
// A simple sequence of RGB bytes
case wxBitmapBufferFormat_RGB:
{
CHECK_BUFFERSIZE(width * height * 3);
if (depth == 24) {
MAKE_PIXDATA(wxNativePixelData);
for (int y=0; y<height; y++) {
rowStart = p;
for (int x=0; x<width; x++) {
*(data++) = p.Red();
*(data++) = p.Green();
*(data++) = p.Blue();
++p;
}
p = rowStart;
p.OffsetY(pixData, 1);
}
}
if (depth == 32) {
// Source has alpha, but we won't be using it because the
// destination buffer doesn't
MAKE_PIXDATA(wxAlphaPixelData);
for (int y=0; y<height; y++) {
rowStart = p;
for (int x=0; x<width; x++) {
*(data++) = p.Red();
*(data++) = p.Green();
*(data++) = p.Blue();
++p;
}
p = rowStart;
p.OffsetY(pixData, 1);
}
}
break;
}
// A simple sequence of RGBA bytes
case wxBitmapBufferFormat_RGBA:
{
CHECK_BUFFERSIZE(width * height * 4);
if (depth == 24) {
MAKE_PIXDATA(wxNativePixelData);
for (int y=0; y<height; y++) {
rowStart = p;
for (int x=0; x<width; x++) {
byte a = wxALPHA_OPAQUE;
*(data++) = wxPy_unpremultiply(p.Red(), a);
*(data++) = wxPy_unpremultiply(p.Green(), a);
*(data++) = wxPy_unpremultiply(p.Blue(), a);
*(data++) = a;
++p;
}
p = rowStart;
p.OffsetY(pixData, 1);
}
}
if (depth == 32) {
MAKE_PIXDATA(wxAlphaPixelData);
for (int y=0; y<height; y++) {
rowStart = p;
for (int x=0; x<width; x++) {
byte a = p.Alpha();
*(data++) = wxPy_unpremultiply(p.Red(), a);
*(data++) = wxPy_unpremultiply(p.Green(), a);
*(data++) = wxPy_unpremultiply(p.Blue(), a);
*(data++) = a;
++p;
}
p = rowStart;
p.OffsetY(pixData, 1);
}
}
break;
}
// A sequence of 32-bit values in native endian order,
// where the alpha is in the upper 8 bits, then red, then
// green, then blue. The stride is the distance in bytes
// from the beginning of one row of the image data to the
// beginning of the next row. This may not be the same as
// width*4 if alignment or platform specific optimizations
// have been utilized.
// NOTE: This is normally used with Cairo, which seems to
// already have the values premultiplied. Should we have
// a way to optionally do it anyway?
case wxBitmapBufferFormat_RGB32:
case wxBitmapBufferFormat_ARGB32:
{
bool useAlpha = (format == wxBitmapBufferFormat_ARGB32);
byte* dataRow = data;
wxUint32* bufptr;
wxUint32 value;
if (stride == -1)
stride = width * 4;
CHECK_BUFFERSIZE(stride * height);
if (useAlpha && depth == 32) {
MAKE_PIXDATA(wxAlphaPixelData);
for (int y=0; y<height; y++) {
p.MoveTo(pixData, 0, y);
bufptr = (wxUint32*)dataRow;
for (int x=0; x<width; x++) {
value =
(p.Alpha() << 24) |
(p.Red() << 16) |
(p.Green() << 8) |
(p.Blue());
*bufptr = value;
++p;
++bufptr;
}
dataRow += stride;
}
}
else // if (!useAlpha /*depth == 24*/)
{
MAKE_PIXDATA(wxNativePixelData);
for (int y=0; y<height; y++) {
p.MoveTo(pixData, 0, y);
bufptr = (wxUint32*)dataRow;
for (int x=0; x<width; x++) {
value =
(wxALPHA_OPAQUE << 24) |
(p.Red() << 16) |
(p.Green() << 8) |
(p.Blue());
*bufptr = value;
++p;
++bufptr;
}
dataRow += stride;
}
}
break;
}
}
}
//--------------------------------------------------------------------------