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Create virtual Fl_RGB_Image* Fl_Gl_Window_Driver::capture_gl_rectangle()

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This commit is contained in:
ManoloFLTK 2021-02-16 10:26:42 +01:00
parent 1adaa3def2
commit 06793c50fb
4 changed files with 63 additions and 59 deletions
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1
FL/Fl_Gl_Window.H
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@ -51,6 +51,7 @@ class Fl_Gl_Window_Driver;
class FL_EXPORT Fl_Gl_Window : public Fl_Window {
friend class Fl_Gl_Window_Driver;
friend class _Fl_Gl_Overlay;
friend class Fl_OpenGL_Display_Device;
Fl_Gl_Window_Driver *pGlWindowDriver;
/** Returns a pointer to the window's Fl_Gl_Window_Driver object */

1
src/Fl_Gl_Window_Driver.H
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@ -99,6 +99,7 @@ public:
virtual char *alpha_mask_for_string(const char *str, int n, int w, int h);
virtual int genlistsize() { return 0; } // support for gl_draw()
virtual Fl_Font_Descriptor** fontnum_to_fontdescriptor(int fnum);
virtual Fl_RGB_Image* capture_gl_rectangle(int x, int y, int w, int h);
};
#endif /* Fl_Gl_Window_Driver_H */

53
src/drivers/Cocoa/Fl_Cocoa_Gl_Window_Driver.cxx
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@ -54,6 +54,7 @@ class Fl_Cocoa_Gl_Window_Driver : public Fl_Gl_Window_Driver {
virtual void redraw_overlay();
virtual void gl_start();
virtual char *alpha_mask_for_string(const char *str, int n, int w, int h);
virtual Fl_RGB_Image* capture_gl_rectangle(int x, int y, int w, int h);
};
// Describes crap needed to create a GLContext.
@ -245,4 +246,56 @@ void Fl_Cocoa_Gl_Window_Driver::gl_start() {
Fl_Cocoa_Window_Driver::gl_start(gl_start_context);
}
// convert BGRA to RGB and also exchange top and bottom
static uchar *convert_BGRA_to_RGB(uchar *baseAddress, int w, int h, int mByteWidth)
{
uchar *newimg = new uchar[3*w*h];
uchar *to = newimg;
for (int i = h-1; i >= 0; i--) {
uchar *from = baseAddress + i * mByteWidth;
for (int j = 0; j < w; j++, from += 4) {
#if defined(__ppc__) && __ppc__
memcpy(to, from + 1, 3);
to += 3;
#else
*(to++) = *(from+2);
*(to++) = *(from+1);
*(to++) = *from;
#endif
}
}
delete[] baseAddress;
return newimg;
}
Fl_RGB_Image* Fl_Cocoa_Gl_Window_Driver::capture_gl_rectangle(int x, int y, int w, int h)
{
Fl_Gl_Window* glw = pWindow;
float factor = glw->pixels_per_unit();
if (factor != 1) {
w *= factor; h *= factor; x *= factor; y *= factor;
}
Fl_Cocoa_Window_Driver::GLcontext_makecurrent(glw->context());
Fl_Cocoa_Window_Driver::flush_context(glw->context()); // to capture also the overlay and for directGL demo
// Read OpenGL context pixels directly.
// For extra safety, save & restore OpenGL states that are changed
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
// Read a block of pixels from the frame buffer
int mByteWidth = w * 4;
mByteWidth = (mByteWidth + 3) & ~3; // Align to 4 bytes
uchar *baseAddress = new uchar[mByteWidth * h];
glReadPixels(x, glw->pixel_h() - (y+h), w, h,
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, baseAddress);
glPopClientAttrib();
baseAddress = convert_BGRA_to_RGB(baseAddress, w, h, mByteWidth);
Fl_RGB_Image *img = new Fl_RGB_Image(baseAddress, w, h, 3, 3 * w);
img->alloc_array = 1;
Fl_Cocoa_Window_Driver::flush_context(glw->context());
return img;
}
#endif // HAVE_GL

67
src/drivers/OpenGL/Fl_OpenGL_Display_Device.cxx
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@ -16,7 +16,10 @@
#include "../../config_lib.h"
#include <FL/Fl_Gl_Window.H>
#include "../../Fl_Gl_Window_Driver.H"
#include <FL/Fl_Image.H>
#include "../../Fl_Screen_Driver.H"
#include "../../Fl_Window_Driver.H"
#include <FL/gl.h>
#include <string.h>
@ -35,69 +38,17 @@ Fl_OpenGL_Display_Device::Fl_OpenGL_Display_Device(Fl_OpenGL_Graphics_Driver *gr
{
}
#ifdef FL_CFG_GFX_QUARTZ
#include "../../Fl_Gl_Window_Driver.H"
#include "../Cocoa/Fl_Cocoa_Window_Driver.H"
// convert BGRA to RGB and also exchange top and bottom
static uchar *convert_BGRA_to_RGB(uchar *baseAddress, int w, int h, int mByteWidth)
{
uchar *newimg = new uchar[3*w*h];
uchar *to = newimg;
for (int i = h-1; i >= 0; i--) {
uchar *from = baseAddress + i * mByteWidth;
for (int j = 0; j < w; j++, from += 4) {
#if defined(__ppc__) && __ppc__
memcpy(to, from + 1, 3);
to += 3;
#else
*(to++) = *(from+2);
*(to++) = *(from+1);
*(to++) = *from;
#endif
}
}
delete[] baseAddress;
return newimg;
}
Fl_RGB_Image* Fl_OpenGL_Display_Device::capture_gl_rectangle(Fl_Gl_Window* glw, int x, int y, int w, int h)
{
float factor = glw->pixels_per_unit();
if (factor != 1) {
w *= factor; h *= factor; x *= factor; y *= factor;
}
Fl_Cocoa_Window_Driver::GLcontext_makecurrent(glw->context());
Fl_Cocoa_Window_Driver::flush_context(glw->context()); // to capture also the overlay and for directGL demo
// Read OpenGL context pixels directly.
// For extra safety, save & restore OpenGL states that are changed
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT);
glPixelStorei(GL_PACK_ALIGNMENT, 4); /* Force 4-byte alignment */
glPixelStorei(GL_PACK_ROW_LENGTH, 0);
glPixelStorei(GL_PACK_SKIP_ROWS, 0);
glPixelStorei(GL_PACK_SKIP_PIXELS, 0);
// Read a block of pixels from the frame buffer
int mByteWidth = w * 4;
mByteWidth = (mByteWidth + 3) & ~3; // Align to 4 bytes
uchar *baseAddress = new uchar[mByteWidth * h];
glReadPixels(x, glw->pixel_h() - (y+h), w, h,
GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV, baseAddress);
glPopClientAttrib();
baseAddress = convert_BGRA_to_RGB(baseAddress, w, h, mByteWidth);
Fl_RGB_Image *img = new Fl_RGB_Image(baseAddress, w, h, 3, 3 * w);
img->alloc_array = 1;
Fl_Cocoa_Window_Driver::flush_context(glw->context());
return img;
return glw->gl_driver()->capture_gl_rectangle(x, y, w, h);
}
#else
#include "../../Fl_Screen_Driver.H"
#include "../../Fl_Window_Driver.H"
Fl_RGB_Image* Fl_OpenGL_Display_Device::capture_gl_rectangle(Fl_Gl_Window *glw, int x, int y, int w, int h)
/* captures a rectangle of a Fl_Gl_Window window, and returns it as a RGB image
/* Captures a rectangle of a Fl_Gl_Window and returns it as a RGB image.
This is the platform-independent version. Some platforms may re-implement it.
*/
Fl_RGB_Image* Fl_Gl_Window_Driver::capture_gl_rectangle(int x, int y, int w, int h)
{
Fl_Gl_Window *glw = pWindow;
glw->flush(); // forces a GL redraw, necessary for the glpuzzle demo
// Read OpenGL context pixels directly.
// For extra safety, save & restore OpenGL states that are changed
@ -135,5 +86,3 @@ Fl_RGB_Image* Fl_OpenGL_Display_Device::capture_gl_rectangle(Fl_Gl_Window *glw,
img->alloc_array = 1;
return img;
}
#endif