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-rw-r--r--FL/Fl_Graphics_Driver.H112
-rw-r--r--src/Fl_Device.cxx1
-rw-r--r--src/Fl_Graphics_Driver.cxx25
-rw-r--r--src/Fl_Image_Surface.cxx1
-rw-r--r--src/Fl_Printer.cxx5
-rw-r--r--src/fl_arc.cxx1
-rw-r--r--src/fl_curve.cxx1
-rw-r--r--src/fl_rect.cxx4
-rw-r--r--src/fl_vertex.cxx16
9 files changed, 129 insertions, 37 deletions
diff --git a/FL/Fl_Graphics_Driver.H b/FL/Fl_Graphics_Driver.H
index de54c72e3..6283db6e7 100644
--- a/FL/Fl_Graphics_Driver.H
+++ b/FL/Fl_Graphics_Driver.H
@@ -33,7 +33,12 @@
#include <stdlib.h>
class Fl_Graphics_Driver;
-class Fl_Font_Descriptor;
+/** a platform-specific class implementing a system font */
+class Fl_Font_Descriptor
+#ifdef FL_DOXYGEN
+{}
+#endif
+;
/** \brief Points to the driver that currently receives all graphics requests */
FL_EXPORT extern Fl_Graphics_Driver *fl_graphics_driver;
@@ -66,14 +71,19 @@ typedef void (*Fl_Draw_Image_Cb)(void* data,int x,int y,int w,uchar* buf);
*/
class FL_EXPORT Fl_Graphics_Driver {
friend class Fl_Surface_Device;
+ friend class Fl_Display_Device;
friend class Fl_Pixmap;
friend class Fl_Bitmap;
friend class Fl_RGB_Image;
friend int fl_draw_pixmap(const char*const* cdata, int x, int y, Fl_Color bg);
+ friend void gl_start();
public:
// The following functions create the various graphics drivers that are required
// for core operations. They must be implemented as members of Fl_Graphics_Driver,
// but located in the device driver module that is linked to the core library
+ /** Instantiate the graphics driver adequate to draw to the platform's display driver.
+ Each platform implements this method its own way.
+ */
static Fl_Graphics_Driver *newMainGraphicsDriver();
//static Fl_Graphics_Driver *newOpenGLGraphicsDriver();
//static Fl_Graphics_Driver *newPrinterGraphicsDriver();
@@ -87,57 +97,84 @@ public:
PRINTER = 2 /**< graphics driver for a printer drawing surface */
} driver_feature;
- int fl_clip_state_number;
protected:
- static const matrix m0;
- Fl_Font font_; // current font
- Fl_Fontsize size_; // current font size
- Fl_Color color_; // current color
- int sptr;
- static const int matrix_stack_size = FL_MATRIX_STACK_SIZE;
- matrix stack[FL_MATRIX_STACK_SIZE];
- matrix m;
- int n, gap_;
- int what;
- int rstackptr;
- static const int region_stack_max = FL_REGION_STACK_SIZE - 1;
- Fl_Region rstack[FL_REGION_STACK_SIZE];
- Fl_Font_Descriptor *font_descriptor_;
+ int fl_clip_state_number; ///< For internal use by FLTK
+ static const matrix m0; ///< For internal use by FLTK
+ Fl_Font font_; ///< current font
+ Fl_Fontsize size_; ///< current font size
+ Fl_Color color_; ///< current color
+ int sptr;///< For internal use by FLTK
+ static const int matrix_stack_size = FL_MATRIX_STACK_SIZE; ///< For internal use by FLTK
+ matrix stack[FL_MATRIX_STACK_SIZE]; ///< For internal use by FLTK
+ matrix m; ///< current transformation matrix
+ int n; ///< For internal use by FLTK
+ int gap_; ///< For internal use by FLTK
+ int what; ///< For internal use by FLTK
+ int rstackptr; ///< For internal use by FLTK
+ static const int region_stack_max = FL_REGION_STACK_SIZE - 1; ///< For internal use by FLTK
+ Fl_Region rstack[FL_REGION_STACK_SIZE]; ///< For internal use by FLTK
+ Fl_Font_Descriptor *font_descriptor_; ///< For internal use by FLTK
#ifndef FL_DOXYGEN
enum {LINE, LOOP, POLYGON, POINT_};
inline int vertex_no() { return n; }
inline int vertex_kind() {return what;}
#endif
matrix *fl_matrix; /**< Points to the current coordinate transformation matrix */
+ /** Returns whether the graphics driver is currently drawing to a high resolution surface */
+ virtual bool high_resolution() { return false; }
+ virtual void global_gc();
+ virtual fl_uintptr_t cache(Fl_Pixmap *img, int w, int h, const char *const*array) { return 0; }
+ virtual fl_uintptr_t cache(Fl_Bitmap *img, int w, int h, const uchar *array) { return 0; }
+ virtual void uncache(Fl_RGB_Image *img, fl_uintptr_t &id_, fl_uintptr_t &mask_) { }
- // === all code below in this class has been to the reorganisation FL_PORTING process
public:
Fl_Graphics_Driver();
- virtual ~Fl_Graphics_Driver() {}
+ virtual ~Fl_Graphics_Driver() {} ///< Destructor
static Fl_Graphics_Driver &default_driver();
+ /** Return whether the graphics driver can do alpha blending */
virtual char can_do_alpha_blending() { return 0; }
// --- implementation is in src/fl_rect.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_rect.cxx
+ /** see fl_point() */
virtual void point(int x, int y) = 0;
+ /** see fl_rect() */
virtual void rect(int x, int y, int w, int h) = 0;
virtual void focus_rect(int x, int y, int w, int h);
+ /** see fl_rectf() */
virtual void rectf(int x, int y, int w, int h) = 0;
+ /** see fl_line(int, int, int, int) */
virtual void line(int x, int y, int x1, int y1) = 0;
+ /** see fl_line(int, int, int, int, int, int) */
virtual void line(int x, int y, int x1, int y1, int x2, int y2) = 0;
+ /** see fl_xyline(int, int, int) */
virtual void xyline(int x, int y, int x1) = 0;
+ /** see fl_xyline(int, int, int, int) */
virtual void xyline(int x, int y, int x1, int y2) = 0;
+ /** see fl_xyline(int, int, int, int, int) */
virtual void xyline(int x, int y, int x1, int y2, int x3) = 0;
+ /** see fl_yxline(int, int, int) */
virtual void yxline(int x, int y, int y1) = 0;
+ /** see fl_yxline(int, int, int, int) */
virtual void yxline(int x, int y, int y1, int x2) = 0;
+ /** see fl_yxline(int, int, int, int, int) */
virtual void yxline(int x, int y, int y1, int x2, int y3) = 0;
+ /** see fl_loop(int, int, int, int, int, int) */
virtual void loop(int x0, int y0, int x1, int y1, int x2, int y2) = 0;
+ /** see fl_loop(int, int, int, int, int, int, int, int) */
virtual void loop(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3) = 0;
+ /** see fl_polygon(int, int, int, int, int, int) */
virtual void polygon(int x0, int y0, int x1, int y1, int x2, int y2) = 0;
+ /** see fl_polygon(int, int, int, int, int, int, int, int) */
virtual void polygon(int x0, int y0, int x1, int y1, int x2, int y2, int x3, int y3) = 0;
// --- clipping
+ /** see fl_push_clip() */
virtual void push_clip(int x, int y, int w, int h) = 0;
+ /** see fl_clip_box() */
virtual int clip_box(int x, int y, int w, int h, int &X, int &Y, int &W, int &H) = 0;
+ /** see fl_not_clipped() */
virtual int not_clipped(int x, int y, int w, int h) = 0;
+ /** see fl_push_no_clip() */
virtual void push_no_clip() = 0;
+ /** see fl_pop_clip() */
virtual void pop_clip() = 0;
virtual Fl_Region clip_region(); // has default implementation
virtual void clip_region(Fl_Region r); // has default implementation
@@ -154,57 +191,83 @@ public:
virtual void begin_line();
virtual void begin_loop();
virtual void begin_polygon();
+ /** see fl_begin_complex_polygon() */
virtual void begin_complex_polygon() = 0;
virtual double transform_x(double x, double y);
virtual double transform_y(double x, double y);
virtual double transform_dx(double x, double y);
virtual double transform_dy(double x, double y);
+ /** see fl_transformed_vertex() */
virtual void transformed_vertex(double xf, double yf) = 0;
+ /** see fl_vertex() */
virtual void vertex(double x, double y) = 0;
+ /** see fl_end_points() */
virtual void end_points() = 0;
+ /** see fl_end_line() */
virtual void end_line() = 0;
+ /** see fl_end_loop() */
virtual void end_loop() = 0;
+ /** see fl_end_polygon() */
virtual void end_polygon() = 0;
+ /** see fl_end_complex_polygon() */
virtual void end_complex_polygon() = 0;
+ /** see fl_gap() */
virtual void gap() = 0;
+ /** see fl_circle() */
virtual void circle(double x, double y, double r) = 0;
// --- implementation is in src/fl_arc.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_arc.cxx if needed
virtual void arc(double x, double y, double r, double start, double end);
// --- implementation is in src/fl_arci.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_arci.cxx
+ /** see fl_arc(int x, int y, int w, int h, double a1, double a2) */
virtual void arc(int x, int y, int w, int h, double a1, double a2) = 0;
+ /** see fl_pie() */
virtual void pie(int x, int y, int w, int h, double a1, double a2) = 0;
// --- implementation is in src/fl_curve.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_curve.cxx if needed
virtual void curve(double X0, double Y0, double X1, double Y1, double X2, double Y2, double X3, double Y3);
// --- implementation is in src/fl_line_style.cxx which includes src/cfg_gfx/xxx_line_style.cxx
+ /** see fl_line_style() */
virtual void line_style(int style, int width=0, char* dashes=0) = 0;
// --- implementation is in src/fl_color.cxx which includes src/cfg_gfx/xxx_color.cxx
+ /** see fl_color(Fl_Color) */
virtual void color(Fl_Color c) { color_ = c; }
virtual void set_color(Fl_Color i, unsigned int c);
virtual void free_color(Fl_Color i, int overlay);
+ /** see fl_color(void) */
virtual Fl_Color color() { return color_; }
+ /** see fl_color(uchar, uchar, uchar) */
virtual void color(uchar r, uchar g, uchar b) = 0;
// --- implementation is in src/fl_font.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_font.cxx
+ /** see fl_draw(const char *str, int n, int x, int y) */
virtual void draw(const char *str, int n, int x, int y) = 0;
+ /** Draw the first \p n bytes of the string \p str starting at position \p x , \p y */
virtual void draw(const char *str, int n, float x, float y) { draw(str, n, (int)(x+0.5), (int)(y+0.5));}
+ /** see fl_draw(int angle, const char *str, int n, int x, int y) */
virtual void draw(int angle, const char *str, int n, int x, int y) { draw(str, n, x, y); }
+ /** see fl_rtl_draw(const char *str, int n, int x, int y) */
virtual void rtl_draw(const char *str, int n, int x, int y) { draw(str, n, x, y); }
/** Returns non-zero if the graphics driver possesses the \p feature */
virtual int has_feature(driver_feature feature) { return 0; }
+ /** see fl_font(Fl_Font, Fl_Fontsize) */
virtual void font(Fl_Font face, Fl_Fontsize fsize) {font_ = face; size_ = fsize;}
+ /** see fl_font(void) */
virtual Fl_Font font() {return font_; }
+ /** Return the current font size */
virtual Fl_Fontsize size() {return size_; }
+ /** Compute the width of the first \p n bytes of the string \p str if drawn with current font */
virtual double width(const char *str, int n) { return 0; }
+ /** Compute the width of Unicode character \p c if drawn with current font */
virtual double width(unsigned int c) { char ch = (char)c; return width(&ch, 1); }
virtual void text_extents(const char*, int n, int& dx, int& dy, int& w, int& h);
+ /** Return the current line height */
virtual int height() { return size(); }
+ /** Return the current line descent */
virtual int descent() { return 0; }
+ /** Return the current Fl_Font_Descriptor */
virtual Fl_Font_Descriptor *font_descriptor() { return font_descriptor_;}
+ /** Set the current Fl_Font_Descriptor */
virtual void font_descriptor(Fl_Font_Descriptor *d) { font_descriptor_ = d;}
// --- implementation is in src/fl_image.cxx which includes src/drivers/xxx/Fl_xxx_Graphics_Driver_font.cxx
virtual Fl_Bitmask create_bitmask(int w, int h, const uchar *array) = 0;
- virtual fl_uintptr_t cache(Fl_Pixmap *img, int w, int h, const char *const*array) { return 0; }
- virtual fl_uintptr_t cache(Fl_Bitmap *img, int w, int h, const uchar *array) { return 0; }
- virtual void uncache(Fl_RGB_Image *img, fl_uintptr_t &id_, fl_uintptr_t &mask_) { }
virtual void delete_bitmask(Fl_Bitmask bm) = 0;
virtual void draw_image(const uchar* buf, int X,int Y,int W,int H, int D=3, int L=0) {}
virtual void draw_image_mono(const uchar* buf, int X,int Y,int W,int H, int D=1, int L=0) {}
@@ -240,8 +303,10 @@ public:
/** Support for pixmap drawing */
virtual void mask_bitmap(uchar **) {}
// default implementation may be enough
+ /** Support for PostScript drawing */
virtual float scale_font_for_PostScript(Fl_Font_Descriptor *desc, int s) { return float(s); }
// default implementation may be enough
+ /** Support for PostScript drawing */
virtual float scale_bitmap_for_PostScript() { return 2; }
virtual void set_spot(int font, int size, int X, int Y, int W, int H, Fl_Window *win);
virtual void reset_spot();
@@ -249,11 +314,6 @@ public:
virtual void add_rectangle_to_region(Fl_Region r, int x, int y, int w, int h);
virtual Fl_Region XRectangleRegion(int x, int y, int w, int h);
virtual void XDestroyRegion(Fl_Region r);
- // the default implementation may be enough
- virtual bool high_resolution() { return false; }
-protected:
- // --- implementation is in src/fl_vertex.cxx which includes src/cfg_gfx/xxx_rect.cxx
- virtual void global_gc();
};
#endif // FL_GRAPHICS_DRIVER_H
diff --git a/src/Fl_Device.cxx b/src/Fl_Device.cxx
index 07df9d8db..dd2053f56 100644
--- a/src/Fl_Device.cxx
+++ b/src/Fl_Device.cxx
@@ -78,6 +78,7 @@ Fl_Display_Device *Fl_Display_Device::display_device() {
return display;
};
+/** Returns whether the drawing system is currently targetted to a high resolution display */
bool Fl_Display_Device::high_resolution()
{
return Fl_Display_Device::display_device()->driver()->high_resolution();
diff --git a/src/Fl_Graphics_Driver.cxx b/src/Fl_Graphics_Driver.cxx
index 510852b5b..bc53ef8f8 100644
--- a/src/Fl_Graphics_Driver.cxx
+++ b/src/Fl_Graphics_Driver.cxx
@@ -22,11 +22,13 @@
#include <FL/Fl_Image.H>
#include <FL/fl_draw.H>
-FL_EXPORT Fl_Graphics_Driver *fl_graphics_driver; // the current target device of graphics operations
+FL_EXPORT Fl_Graphics_Driver *fl_graphics_driver; // the current driver of graphics operations
const Fl_Graphics_Driver::matrix Fl_Graphics_Driver::m0 = {1, 0, 0, 1, 0, 0};
-Fl_Graphics_Driver::Fl_Graphics_Driver() {
+/** Constructor */
+Fl_Graphics_Driver::Fl_Graphics_Driver()
+{
font_ = 0;
size_ = 0;
sptr=0; rstackptr=0;
@@ -37,7 +39,7 @@ Fl_Graphics_Driver::Fl_Graphics_Driver() {
font_descriptor_ = NULL;
};
-
+/** Return the graphics driver used when drawing to the platform's display */
Fl_Graphics_Driver &Fl_Graphics_Driver::default_driver()
{
static Fl_Graphics_Driver *pMainDriver = 0L;
@@ -48,7 +50,7 @@ Fl_Graphics_Driver &Fl_Graphics_Driver::default_driver()
}
-
+/** see fl_text_extents() */
void Fl_Graphics_Driver::text_extents(const char*t, int n, int& dx, int& dy, int& w, int& h)
{
w = (int)width(t, n);
@@ -57,6 +59,7 @@ void Fl_Graphics_Driver::text_extents(const char*t, int n, int& dx, int& dy, int
dy = descent();
}
+/** see fl_focus_rect() */
void Fl_Graphics_Driver::focus_rect(int x, int y, int w, int h)
{
line_style(FL_DOT);
@@ -81,50 +84,54 @@ void Fl_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen
delete[] img;
}
-
+/** see fl_set_spot() */
void Fl_Graphics_Driver::set_spot(int font, int size, int X, int Y, int W, int H, Fl_Window *win)
{
// nothing to do, reimplement in driver if needed
}
+/** see fl_reset_spot() */
void Fl_Graphics_Driver::reset_spot()
{
// nothing to do, reimplement in driver if needed
}
+/** Sets the value of the fl_gc global variable when it changes */
void Fl_Graphics_Driver::global_gc()
{
// nothing to do, reimplement in driver if needed
}
-void Fl_Graphics_Driver::set_color(Fl_Color i, unsigned int c)
+/** see Fl::set_color(Fl_Color, unsigned) */
+void Fl_Graphics_Driver::set_color(Fl_Color i, unsigned c)
{
// nothing to do, reimplement in driver if needed
}
+/** see Fl::free_color(Fl_Color, int) */
void Fl_Graphics_Driver::free_color(Fl_Color i, int overlay)
{
// nothing to do, reimplement in driver if needed
}
-
+/** Add a rectangle to an Fl_Region */
void Fl_Graphics_Driver::add_rectangle_to_region(Fl_Region r, int x, int y, int w, int h)
{
// nothing to do, reimplement in driver if needed
}
-
+/** Create a rectangular Fl_Region */
Fl_Region Fl_Graphics_Driver::XRectangleRegion(int x, int y, int w, int h)
{
// nothing to do, reimplement in driver if needed
return 0;
}
-
+/** Delete an Fl_Region */
void Fl_Graphics_Driver::XDestroyRegion(Fl_Region r)
{
// nothing to do, reimplement in driver if needed
diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx
index 227186c26..3db192962 100644
--- a/src/Fl_Image_Surface.cxx
+++ b/src/Fl_Image_Surface.cxx
@@ -58,6 +58,7 @@ void Fl_Image_Surface::translate(int x, int y) {platform_surface->translate(x, y
void Fl_Image_Surface::untranslate() {platform_surface->untranslate();}
+/** Returns the Fl_Offscreen object associated to the image surface */
Fl_Offscreen Fl_Image_Surface::offscreen() {return platform_surface->offscreen;}
int Fl_Image_Surface::printable_rect(int *w, int *h) {return platform_surface->printable_rect(w, h);}
diff --git a/src/Fl_Printer.cxx b/src/Fl_Printer.cxx
index b08335500..a6756acdc 100644
--- a/src/Fl_Printer.cxx
+++ b/src/Fl_Printer.cxx
@@ -187,6 +187,11 @@ void Fl_Printer::end_job (void)
printer->end_job();
}
+/** Prints the widget on the drawing surface.
+ \param[in] widget Any FLTK widget (e.g., standard, custom, window, GL window).
+ \param[in] delta_x,delta_y Optional offsets for positioning the widget's
+ top-left corner relatively to the current origin of graphics functions.
+ */
void Fl_Printer::print_widget(Fl_Widget* widget, int delta_x, int delta_y)
{
printer->draw(widget, delta_x, delta_y);
diff --git a/src/fl_arc.cxx b/src/fl_arc.cxx
index f33d166e9..240e254de 100644
--- a/src/fl_arc.cxx
+++ b/src/fl_arc.cxx
@@ -34,6 +34,7 @@ static double _fl_hypot(double x, double y) {
return sqrt(x*x + y*y);
}
+/** see fl_arc(double x, double y, double r, double start, double end) */
void Fl_Graphics_Driver::arc(double x, double y, double r, double start, double end) {
// draw start point accurately:
diff --git a/src/fl_curve.cxx b/src/fl_curve.cxx
index 21a5f4ffb..ebe75a448 100644
--- a/src/fl_curve.cxx
+++ b/src/fl_curve.cxx
@@ -29,6 +29,7 @@
#include <FL/fl_draw.H>
#include <math.h>
+/** see fl_curve() */
void Fl_Graphics_Driver::curve(double X0, double Y0,
double X1, double Y1,
double X2, double Y2,
diff --git a/src/fl_rect.cxx b/src/fl_rect.cxx
index af096d390..0b9595dae 100644
--- a/src/fl_rect.cxx
+++ b/src/fl_rect.cxx
@@ -39,11 +39,12 @@
extern int fl_line_width_;
+/** see fl_restore_clip() */
void Fl_Graphics_Driver::restore_clip() {
fl_clip_state_number++;
}
-
+/** see fl_clip_region(Fl_Region) */
void Fl_Graphics_Driver::clip_region(Fl_Region r) {
Fl_Region oldr = rstack[rstackptr];
if (oldr) XDestroyRegion(oldr);
@@ -52,6 +53,7 @@ void Fl_Graphics_Driver::clip_region(Fl_Region r) {
}
+/** see fl_clip_region(void) */
Fl_Region Fl_Graphics_Driver::clip_region() {
return rstack[rstackptr];
}
diff --git a/src/fl_vertex.cxx b/src/fl_vertex.cxx
index e108d2163..48d9be386 100644
--- a/src/fl_vertex.cxx
+++ b/src/fl_vertex.cxx
@@ -37,7 +37,7 @@
#include <FL/math.h>
#include <stdlib.h>
-
+/** see fl_push_matrix() */
void Fl_Graphics_Driver::push_matrix() {
if (sptr==matrix_stack_size)
Fl::error("fl_push_matrix(): matrix stack overflow.");
@@ -45,6 +45,7 @@ void Fl_Graphics_Driver::push_matrix() {
stack[sptr++] = m;
}
+/** see fl_pop_matrix() */
void Fl_Graphics_Driver::pop_matrix() {
if (sptr==0)
Fl::error("fl_pop_matrix(): matrix stack underflow.");
@@ -52,6 +53,7 @@ void Fl_Graphics_Driver::pop_matrix() {
m = stack[--sptr];
}
+/** see fl_mult_matrix() */
void Fl_Graphics_Driver::mult_matrix(double a, double b, double c, double d, double x, double y) {
matrix o;
o.a = a*m.a + b*m.c;
@@ -63,6 +65,7 @@ void Fl_Graphics_Driver::mult_matrix(double a, double b, double c, double d, dou
m = o;
}
+/** see fl_rotate() */
void Fl_Graphics_Driver::rotate(double d) {
if (d) {
double s, c;
@@ -75,50 +78,61 @@ void Fl_Graphics_Driver::rotate(double d) {
}
}
+/** see fl_scale(double, double) */
void Fl_Graphics_Driver::scale(double x, double y) {
mult_matrix(x,0,0,y,0,0);
}
+/** see fl_scale(double) */
void Fl_Graphics_Driver::scale(double x) {
mult_matrix(x,0,0,x,0,0);
}
+/** see fl_translate() */
void Fl_Graphics_Driver::translate(double x,double y) {
mult_matrix(1,0,0,1,x,y);
}
+/** see fl_begin_points() */
void Fl_Graphics_Driver::begin_points() {
n = 0;
what = POINT_;
}
+/** see fl_begin_line() */
void Fl_Graphics_Driver::begin_line() {
n = 0;
what = LINE;
}
+/** see fl_begin_loop() */
void Fl_Graphics_Driver::begin_loop() {
n = 0;
what = LOOP;
}
+/** see fl_begin_polygon() */
void Fl_Graphics_Driver::begin_polygon() {
n = 0;
what = POLYGON;
}
+/** see fl_transform_x() */
double Fl_Graphics_Driver::transform_x(double x, double y) {
return x*m.a + y*m.c + m.x;
}
+/** see fl_transform_y() */
double Fl_Graphics_Driver::transform_y(double x, double y) {
return x*m.b + y*m.d + m.y;
}
+/** see fl_transform_dx() */
double Fl_Graphics_Driver::transform_dx(double x, double y) {
return x*m.a + y*m.c;
}
+/** see fl_transform_dy() */
double Fl_Graphics_Driver::transform_dy(double x, double y) {
return x*m.b + y*m.d;
}
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