WIP: Moved sources int src/, separated most of the source code from Perl.

The XS was left only for the unit / integration tests, and it links
libslic3r only. No wxWidgets are allowed to be used from Perl starting
from now.

src/slic3r/GUI/BitmapCache.cpp

@@ -0,0 +1,172 @@
+#include "BitmapCache.hpp"
+
+#if ! defined(WIN32) && ! defined(__APPLE__)
+#define BROKEN_ALPHA
+#endif
+
+#ifdef BROKEN_ALPHA
+    #include <wx/mstream.h>
+    #include <wx/rawbmp.h>
+#endif /* BROKEN_ALPHA */
+
+namespace Slic3r { namespace GUI {
+
+void BitmapCache::clear()
+{
+    for (std::pair<const std::string, wxBitmap*> &bitmap : m_map)
+        delete bitmap.second;
+}
+
+static wxBitmap wxImage_to_wxBitmap_with_alpha(wxImage &&image)
+{
+#ifdef BROKEN_ALPHA
+    wxMemoryOutputStream stream;
+    image.SaveFile(stream, wxBITMAP_TYPE_PNG);
+    wxStreamBuffer *buf = stream.GetOutputStreamBuffer();
+    return wxBitmap::NewFromPNGData(buf->GetBufferStart(), buf->GetBufferSize());
+#else
+    return wxBitmap(std::move(image));
+#endif
+}
+
+wxBitmap* BitmapCache::insert(const std::string &bitmap_key, size_t width, size_t height)
+{
+    wxBitmap *bitmap = nullptr;
+    auto      it     = m_map.find(bitmap_key);
+    if (it == m_map.end()) {
+        bitmap = new wxBitmap(width, height);
+        m_map[bitmap_key] = bitmap;
+    } else {
+        bitmap = it->second;
+        if (bitmap->GetWidth() != width || bitmap->GetHeight() != height)
+            bitmap->Create(width, height);
+    }
+#ifndef BROKEN_ALPHA
+    bitmap->UseAlpha();
+#endif
+    return bitmap;
+}
+
+wxBitmap* BitmapCache::insert(const std::string &bitmap_key, const wxBitmap &bmp)
+{
+    wxBitmap *bitmap = nullptr;
+    auto      it     = m_map.find(bitmap_key);
+    if (it == m_map.end()) {
+        bitmap = new wxBitmap(bmp);
+        m_map[bitmap_key] = bitmap;
+    } else {
+        bitmap = it->second;
+        *bitmap = bmp;
+    }
+    return bitmap;
+}
+
+wxBitmap* BitmapCache::insert(const std::string &bitmap_key, const wxBitmap &bmp, const wxBitmap &bmp2)
+{
+    // Copying the wxBitmaps is cheap as the bitmap's content is reference counted.
+    const wxBitmap bmps[2] = { bmp, bmp2 };
+    return this->insert(bitmap_key, bmps, bmps + 2);
+}
+
+wxBitmap* BitmapCache::insert(const std::string &bitmap_key, const wxBitmap &bmp, const wxBitmap &bmp2, const wxBitmap &bmp3)
+{
+    // Copying the wxBitmaps is cheap as the bitmap's content is reference counted.
+    const wxBitmap bmps[3] = { bmp, bmp2, bmp3 };
+    return this->insert(bitmap_key, bmps, bmps + 3);
+}
+
+wxBitmap* BitmapCache::insert(const std::string &bitmap_key, const wxBitmap *begin, const wxBitmap *end)
+{
+    size_t width  = 0;
+    size_t height = 0;
+    for (const wxBitmap *bmp = begin; bmp != end; ++ bmp) {
+        width += bmp->GetWidth();
+        height = std::max<size_t>(height, bmp->GetHeight());
+    }
+
+#ifdef BROKEN_ALPHA
+
+    wxImage image(width, height);
+    image.InitAlpha();
+    // Fill in with a white color.
+    memset(image.GetData(), 0x0ff, width * height * 3);
+    // Fill in with full transparency.
+    memset(image.GetAlpha(),    0, width * height);
+    size_t x = 0;
+    for (const wxBitmap *bmp = begin; bmp != end; ++ bmp) {
+        if (bmp->GetWidth() > 0) {
+            if (bmp->GetDepth() == 32) {
+                wxAlphaPixelData data(*const_cast<wxBitmap*>(bmp));
+                data.UseAlpha();
+                if (data) {
+                    for (int r = 0; r < bmp->GetHeight(); ++ r) {
+                        wxAlphaPixelData::Iterator src(data);
+                        src.Offset(data, 0, r);
+                        unsigned char *dst_pixels = image.GetData()  + (x + r * width) * 3;
+                        unsigned char *dst_alpha  = image.GetAlpha() +  x + r * width;
+                        for (int c = 0; c < bmp->GetWidth(); ++ c, ++ src) {
+                            *dst_pixels ++ = src.Red();
+                            *dst_pixels ++ = src.Green();
+                            *dst_pixels ++ = src.Blue();
+                            *dst_alpha  ++ = src.Alpha();
+                        }
+                    }
+                }
+            } else if (bmp->GetDepth() == 24) {
+                wxNativePixelData data(*const_cast<wxBitmap*>(bmp));
+                if (data) {
+                    for (int r = 0; r < bmp->GetHeight(); ++ r) {
+                        wxNativePixelData::Iterator src(data);
+                        src.Offset(data, 0, r);
+                        unsigned char *dst_pixels = image.GetData()  + (x + r * width) * 3;
+                        unsigned char *dst_alpha  = image.GetAlpha() +  x + r * width;
+                        for (int c = 0; c < bmp->GetWidth(); ++ c, ++ src) {
+                            *dst_pixels ++ = src.Red();
+                            *dst_pixels ++ = src.Green();
+                            *dst_pixels ++ = src.Blue();
+                            *dst_alpha  ++ = wxALPHA_OPAQUE;
+                        }
+                    }
+                }
+            }
+        }
+        x += bmp->GetWidth();
+    }
+    return this->insert(bitmap_key, wxImage_to_wxBitmap_with_alpha(std::move(image)));
+
+#else
+
+    wxBitmap *bitmap = this->insert(bitmap_key, width, height);
+    wxMemoryDC memDC;
+    memDC.SelectObject(*bitmap);
+    memDC.SetBackground(*wxTRANSPARENT_BRUSH);
+    memDC.Clear();
+    size_t x = 0;
+    for (const wxBitmap *bmp = begin; bmp != end; ++ bmp) {
+        if (bmp->GetWidth() > 0)
+            memDC.DrawBitmap(*bmp, x, 0, true);
+        x += bmp->GetWidth();
+    }
+    memDC.SelectObject(wxNullBitmap);
+    return bitmap;
+
+#endif
+}
+
+wxBitmap BitmapCache::mksolid(size_t width, size_t height, unsigned char r, unsigned char g, unsigned char b, unsigned char transparency)
+{
+    wxImage image(width, height);
+    image.InitAlpha();
+    unsigned char* imgdata = image.GetData();
+    unsigned char* imgalpha = image.GetAlpha();
+    for (size_t i = 0; i < width * height; ++ i) {
+        *imgdata ++ = r;
+        *imgdata ++ = g;
+        *imgdata ++ = b;
+        *imgalpha ++ = transparency;
+    }
+    return wxImage_to_wxBitmap_with_alpha(std::move(image));
+}
+
+} // namespace GUI
+} // namespace Slic3r