diff options
Diffstat (limited to 'src/Fl_Bitmap.cxx')
| -rw-r--r-- | src/Fl_Bitmap.cxx | 73 |
1 files changed, 71 insertions, 2 deletions
diff --git a/src/Fl_Bitmap.cxx b/src/Fl_Bitmap.cxx index c20bfeabf..18d474fb7 100644 --- a/src/Fl_Bitmap.cxx +++ b/src/Fl_Bitmap.cxx @@ -1,5 +1,5 @@ // -// "$Id: Fl_Bitmap.cxx,v 1.5.2.4.2.2 2001/11/18 20:52:27 easysw Exp $" +// "$Id: Fl_Bitmap.cxx,v 1.5.2.4.2.3 2001/11/19 01:06:45 easysw Exp $" // // Bitmap drawing routines for the Fast Light Tool Kit (FLTK). // @@ -29,6 +29,7 @@ #include <FL/Fl_Widget.H> #include <FL/Fl_Menu_Item.H> #include <FL/Fl_Bitmap.H> +#include <string.h> #ifdef WIN32 // Windows bitmask functions... Fl_Bitmask fl_create_bitmask(int w, int h, const uchar *data) { @@ -105,6 +106,7 @@ void Fl_Bitmap::draw(int XP, int YP, int WP, int HP, int cx, int cy) { Fl_Bitmap::~Fl_Bitmap() { if (id) fl_delete_bitmask(id); + if (alloc_array) delete[] array; } void Fl_Bitmap::label(Fl_Widget* w) { @@ -114,6 +116,73 @@ void Fl_Bitmap::label(Fl_Widget* w) { void Fl_Bitmap::label(Fl_Menu_Item* m) { } +Fl_Image *Fl_Bitmap::copy(int W, int H) { + // Optimize the simple copy where the width and height are the same... + if (W == w() && H == h()) return new Fl_Bitmap(array, w(), h()); + + // OK, need to resize the image data; allocate memory and + Fl_Bitmap *new_image; // New RGB image + uchar *new_array, // New array for image data + *new_ptr, // Pointer into new array + new_bit, // Bit for new array + old_bit; // Bit for old array + const uchar *old_ptr; // Pointer into old array + int sx, sy, // Source coordinates + dx, dy, // Destination coordinates + xerr, yerr, // X & Y errors + xmod, ymod, // X & Y moduli + xstep, ystep; // X & Y step increments + + + // Figure out Bresenheim step/modulus values... + xmod = w() % W; + xstep = w() / W; + ymod = h() % H; + ystep = h() / H; + + // Allocate memory for the new image... + new_array = new uchar [H * (W + 7) / 8]; + new_image = new Fl_Bitmap(new_array, W, H); + new_image->alloc_array = 1; + + memset(new_array, 0, H * (W + 7) / 8); + + // Scale the image using a nearest-neighbor algorithm... + for (dy = h(), sy = 0, yerr = H / 2, new_ptr = new_array; dy > 0; dy --) { + for (dx = w(), xerr = W / 2, old_ptr = array + sy * (w() + 7) / 8, sx = 0, new_bit = 128; + dx > 0; + dx --) { + old_bit = 128 >> (sx & 7); + if (old_ptr[sx / 8] & old_bit) *new_ptr |= new_bit; + + if (new_bit > 1) new_bit >>= 1; + else { + new_bit = 128; + new_ptr ++; + } + + sx += xstep; + xerr -= xmod; + + if (xerr <= 0) { + xerr += W; + sx ++; + } + } + + if (new_bit < 128) new_ptr ++; + + sy += ystep; + yerr -= ymod; + if (yerr <= 0) { + yerr += H; + sy ++; + } + } + + return new_image; +} + // -// End of "$Id: Fl_Bitmap.cxx,v 1.5.2.4.2.2 2001/11/18 20:52:27 easysw Exp $". +// End of "$Id: Fl_Bitmap.cxx,v 1.5.2.4.2.3 2001/11/19 01:06:45 easysw Exp $". // |