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//
// Draw-to-image code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2018 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include "Fl_GDI_Graphics_Driver.H"
#include "../WinAPI/Fl_WinAPI_Screen_Driver.H"
#include "Fl_GDI_Image_Surface_Driver.H"
#include <FL/platform.H>
#include <FL/Fl_Bitmap.H>
#include <windows.h>
Fl_GDI_Image_Surface_Driver::Fl_GDI_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, off) {
Fl_Display_Device::display_device(); // make sure fl_graphics_driver was initialized
float d = fl_graphics_driver->scale();
if (!off && d != 1 && high_res) {
w = int(w*d);
h = int(h*d);
}
HDC gc = (HDC)Fl_Graphics_Driver::default_driver().gc();
offscreen = off ? off : (Fl_Offscreen)CreateCompatibleBitmap( (gc ? gc : fl_GetDC(0) ) , w, h);
if (!offscreen) offscreen = (Fl_Offscreen)CreateCompatibleBitmap(fl_GetDC(0), w, h);
driver(Fl_Graphics_Driver::newMainGraphicsDriver());
if (d != 1 && high_res) ((Fl_GDI_Graphics_Driver*)driver())->scale(d);
origin.x = origin.y = 0;
shape_data_ = NULL;
}
Fl_GDI_Image_Surface_Driver::~Fl_GDI_Image_Surface_Driver() {
if (shape_data_ && shape_data_->background) {
DeleteObject(shape_data_->background);
delete shape_data_->mask;
free(shape_data_);
}
if (offscreen && !external_offscreen) DeleteObject((HBITMAP)offscreen);
delete driver();
}
void Fl_GDI_Image_Surface_Driver::set_current() {
HDC gc = fl_makeDC((HBITMAP)offscreen);
driver()->gc(gc);
SetWindowOrgEx(gc, origin.x, origin.y, NULL);
Fl_Surface_Device::set_current();
pre_window = fl_window;
_savedc = SaveDC(gc);
fl_window=(HWND)offscreen;
}
void Fl_GDI_Image_Surface_Driver::translate(int x, int y) {
((Fl_GDI_Graphics_Driver*)driver())->translate_all(x, y);
}
void Fl_GDI_Image_Surface_Driver::untranslate() {
((Fl_GDI_Graphics_Driver*)driver())->untranslate_all();
}
Fl_RGB_Image* Fl_GDI_Image_Surface_Driver::image()
{
if (shape_data_ && shape_data_->background) {
// get the offscreen size in pixels
HDC gc = fl_makeDC((HBITMAP)offscreen);
BITMAPINFO bmi;
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 0;
bmi.bmiHeader.biSizeImage = 0;
GetDIBits(gc, (HBITMAP)offscreen, 0, 0, NULL, &bmi, DIB_RGB_COLORS);
int W = bmi.bmiHeader.biWidth;
int H = bmi.bmiHeader.biHeight;
int line_size = ((3*W+3)/4) * 4;
// read bits of main offscreen
uchar *dib_src = new uchar[line_size * H];
bmi.bmiHeader.biWidth = W;
bmi.bmiHeader.biHeight = H;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biBitCount = 24;
GetDIBits(gc, (HBITMAP)offscreen, 0, H,
dib_src, &bmi, DIB_RGB_COLORS);
// draw above the secondary offscreen the main offscreen masked by shape_data_->mask
GdiFlush();
Fl_Image_Surface_Driver::copy_with_mask(shape_data_->mask, shape_data_->vBits, dib_src, ((3*W+3)/4) * 4, true);
delete shape_data_->mask;
delete[] dib_src;
// write bits of main offscreen
SetDIBits(gc, (HBITMAP)offscreen, 0, H, shape_data_->vBits, &bmi, DIB_RGB_COLORS);
DeleteDC(gc);
DeleteObject(shape_data_->background);
shape_data_->background = NULL;
free(shape_data_);
shape_data_ = NULL;
}
Fl_RGB_Image *image = Fl::screen_driver()->read_win_rectangle( 0, 0, width, height, 0);
return image;
}
void Fl_GDI_Image_Surface_Driver::end_current()
{
HDC gc = (HDC)driver()->gc();
GetWindowOrgEx(gc, &origin);
RestoreDC(gc, _savedc);
DeleteDC(gc);
fl_window = pre_window;
Fl_Surface_Device::end_current();
}
void Fl_GDI_Image_Surface_Driver::mask(const Fl_RGB_Image *mask) {
shape_data_ = (struct shape_data_type*)calloc(1, sizeof(struct shape_data_type));
// get the offscreen size in pixels
HDC gc = fl_makeDC((HBITMAP)offscreen);
BITMAPINFO bmi;
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 0;
bmi.bmiHeader.biSizeImage = 0;
GetDIBits(gc, (HBITMAP)offscreen, 0, 0, NULL, &bmi, DIB_RGB_COLORS);
int W = bmi.bmiHeader.biWidth;
int H = bmi.bmiHeader.biHeight;
shape_data_->mask = Fl_Image_Surface_Driver::RGB3_to_RGB1(mask, W, H);
// duplicate current offscreen content to new offscreen
int line_size = ((3*W+3)/4) * 4;
uchar *dib = new uchar[line_size * H]; // create temporary buffer to read DIB
bmi.bmiHeader.biWidth = W;
bmi.bmiHeader.biHeight = H;
bmi.bmiHeader.biCompression = BI_RGB;
bmi.bmiHeader.biBitCount = 24;
GetDIBits(gc, (HBITMAP)offscreen, 0, H, dib, &bmi, DIB_RGB_COLORS);
HDC background_gc = CreateCompatibleDC(gc);
shape_data_->background =
CreateDIBSection(background_gc, &bmi, DIB_RGB_COLORS,
(void**)&shape_data_->vBits, NULL, 0);
if (!shape_data_->background) {
Fl::error("CreateDIBSection error=%lu", GetLastError());
}
memcpy(shape_data_->vBits, dib, H * line_size);
delete[] dib;
DeleteDC(background_gc);
DeleteDC(gc);
}
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