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/* Copyright 2016 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <FL/Fl_RGB_Image.H>
#include <FL/x.H>
#include <rdr/Exception.h>
#include "Surface.h"
void Surface::clear(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
{
RGBQUAD* out;
int x, y;
r = (unsigned)r * a / 255;
g = (unsigned)g * a / 255;
b = (unsigned)b * a / 255;
out = data;
for (y = 0;y < width();y++) {
for (x = 0;x < height();x++) {
out->rgbRed = r;
out->rgbGreen = g;
out->rgbBlue = b;
out->rgbReserved = a;
out++;
}
}
}
void Surface::draw(int src_x, int src_y, int dst_x, int dst_y,
int dst_w, int dst_h)
{
HDC dc;
dc = CreateCompatibleDC(fl_gc);
if (!dc)
throw rdr::win32_error("CreateCompatibleDC", GetLastError());
if (!SelectObject(dc, bitmap))
throw rdr::win32_error("SelectObject", GetLastError());
if (!BitBlt(fl_gc, dst_x, dst_y, dst_w, dst_h,
dc, src_x, src_y, SRCCOPY)) {
// If the desktop we're rendering to is inactive (like when the screen
// is locked or the UAC is active), then GDI calls will randomly fail.
// This is completely undocumented so we have no idea how best to deal
// with it. For now, we've only seen this error and for this function
// so only ignore this combination.
if (GetLastError() != ERROR_INVALID_HANDLE)
throw rdr::win32_error("BitBlt", GetLastError());
}
DeleteDC(dc);
}
void Surface::draw(Surface* dst, int src_x, int src_y,
int dst_x, int dst_y, int dst_w, int dst_h)
{
HDC origdc, dstdc;
dstdc = CreateCompatibleDC(nullptr);
if (!dstdc)
throw rdr::win32_error("CreateCompatibleDC", GetLastError());
if (!SelectObject(dstdc, dst->bitmap))
throw rdr::win32_error("SelectObject", GetLastError());
origdc = fl_gc;
fl_gc = dstdc;
draw(src_x, src_y, dst_x, dst_y, dst_w, dst_h);
fl_gc = origdc;
DeleteDC(dstdc);
}
void Surface::blend(int /*src_x*/, int /*src_y*/,
int /*dst_x*/, int /*dst_y*/,
int /*dst_w*/, int /*dst_h*/,
int /*a*/)
{
// Compositing doesn't work properly for window DC:s
assert(false);
}
void Surface::blend(Surface* dst, int src_x, int src_y,
int dst_x, int dst_y, int dst_w, int dst_h, int a)
{
HDC dstdc, srcdc;
BLENDFUNCTION blend;
dstdc = CreateCompatibleDC(nullptr);
if (!dstdc)
throw rdr::win32_error("CreateCompatibleDC", GetLastError());
srcdc = CreateCompatibleDC(nullptr);
if (!srcdc)
throw rdr::win32_error("CreateCompatibleDC", GetLastError());
if (!SelectObject(dstdc, dst->bitmap))
throw rdr::win32_error("SelectObject", GetLastError());
if (!SelectObject(srcdc, bitmap))
throw rdr::win32_error("SelectObject", GetLastError());
blend.BlendOp = AC_SRC_OVER;
blend.BlendFlags = 0;
blend.SourceConstantAlpha = a;
blend.AlphaFormat = AC_SRC_ALPHA;
if (!AlphaBlend(dstdc, dst_x, dst_y, dst_w, dst_h,
srcdc, src_x, src_y, dst_w, dst_h, blend)) {
// If the desktop we're rendering to is inactive (like when the screen
// is locked or the UAC is active), then GDI calls will randomly fail.
// This is completely undocumented so we have no idea how best to deal
// with it. For now, we've only seen this error and for this function
// so only ignore this combination.
if (GetLastError() != ERROR_INVALID_HANDLE)
throw rdr::win32_error("BitBlt", GetLastError());
}
DeleteDC(srcdc);
DeleteDC(dstdc);
}
void Surface::alloc()
{
BITMAPINFOHEADER bih;
data = new RGBQUAD[width() * height()];
memset(&bih, 0, sizeof(bih));
bih.biSize = sizeof(BITMAPINFOHEADER);
bih.biBitCount = 32;
bih.biPlanes = 1;
bih.biWidth = width();
bih.biHeight = -height(); // Negative to get top-down
bih.biCompression = BI_RGB;
bitmap = CreateDIBSection(nullptr, (BITMAPINFO*)&bih,
DIB_RGB_COLORS, (void**)&data, nullptr, 0);
if (!bitmap)
throw rdr::win32_error("CreateDIBSection", GetLastError());
}
void Surface::dealloc()
{
DeleteObject(bitmap);
}
void Surface::update(const Fl_RGB_Image* image)
{
const unsigned char* in;
RGBQUAD* out;
int x, y;
assert(image->w() == width());
assert(image->h() == height());
// Convert data and pre-multiply alpha
in = (const unsigned char*)image->data()[0];
out = data;
for (y = 0;y < image->w();y++) {
for (x = 0;x < image->h();x++) {
switch (image->d()) {
case 1:
out->rgbBlue = in[0];
out->rgbGreen = in[0];
out->rgbRed = in[0];
out->rgbReserved = 0xff;
break;
case 2:
out->rgbBlue = (unsigned)in[0] * in[1] / 255;
out->rgbGreen = (unsigned)in[0] * in[1] / 255;
out->rgbRed = (unsigned)in[0] * in[1] / 255;
out->rgbReserved = in[1];
break;
case 3:
out->rgbBlue = in[2];
out->rgbGreen = in[1];
out->rgbRed = in[0];
out->rgbReserved = 0xff;
break;
case 4:
out->rgbBlue = (unsigned)in[2] * in[3] / 255;
out->rgbGreen = (unsigned)in[1] * in[3] / 255;
out->rgbRed = (unsigned)in[0] * in[3] / 255;
out->rgbReserved = in[3];
break;
}
in += image->d();
out++;
}
if (image->ld() != 0)
in += image->ld() - image->w() * image->d();
}
}
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