gfx/thebes/gfxWindowsSurface.cpp

   1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
   2  * This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "gfxWindowsSurface.h"
   7 #include "gfxContext.h"
   8 #include "gfxPlatform.h"
   9 #include "mozilla/gfx/2D.h"
  10 #include "mozilla/gfx/HelpersCairo.h"
  11 #include "mozilla/gfx/Logging.h"
  12
  13 #include "cairo.h"
  14 #include "cairo-win32.h"
  15
  16 #include "nsString.h"
  17
  18 gfxWindowsSurface::gfxWindowsSurface(HDC dc, uint32_t flags)
  19     : mOwnsDC(false), mDC(dc), mWnd(nullptr) {
  20   InitWithDC(flags);
  21 }
  22
  23 void gfxWindowsSurface::MakeInvalid(mozilla::gfx::IntSize& size) {
  24   size = mozilla::gfx::IntSize(-1, -1);
  25 }
  26
  27 gfxWindowsSurface::gfxWindowsSurface(const mozilla::gfx::IntSize& realSize,
  28                                      gfxImageFormat imageFormat)
  29     : mOwnsDC(false), mWnd(nullptr) {
  30   mozilla::gfx::IntSize size(realSize);
  31   if (!mozilla::gfx::Factory::CheckSurfaceSize(size)) MakeInvalid(size);
  32
  33   cairo_format_t cformat = GfxFormatToCairoFormat(imageFormat);
  34   cairo_surface_t* surf =
  35       cairo_win32_surface_create_with_dib(cformat, size.width, size.height);
  36
  37   Init(surf);
  38
  39   if (CairoStatus() == CAIRO_STATUS_SUCCESS) {
  40     mDC = cairo_win32_surface_get_dc(CairoSurface());
  41     RecordMemoryUsed(size.width * size.height * 4 + sizeof(gfxWindowsSurface));
  42   } else {
  43     mDC = nullptr;
  44   }
  45 }
  46
  47 gfxWindowsSurface::gfxWindowsSurface(cairo_surface_t* csurf)
  48     : mOwnsDC(false), mWnd(nullptr) {
  49   if (cairo_surface_status(csurf) == 0)
  50     mDC = cairo_win32_surface_get_dc(csurf);
  51   else
  52     mDC = nullptr;
  53
  54   MOZ_ASSERT(cairo_surface_get_type(csurf) !=
  55              CAIRO_SURFACE_TYPE_WIN32_PRINTING);
  56
  57   Init(csurf, true);
  58 }
  59
  60 void gfxWindowsSurface::InitWithDC(uint32_t flags) {
  61   if (flags & FLAG_IS_TRANSPARENT) {
  62     Init(cairo_win32_surface_create_with_format(mDC, CAIRO_FORMAT_ARGB32));
  63   } else {
  64     Init(cairo_win32_surface_create(mDC));
  65   }
  66 }
  67
  68 gfxWindowsSurface::~gfxWindowsSurface() {
  69   if (mOwnsDC) {
  70     if (mWnd)
  71       ::ReleaseDC(mWnd, mDC);
  72     else
  73       ::DeleteDC(mDC);
  74   }
  75 }
  76
  77 HDC gfxWindowsSurface::GetDC() {
  78   return cairo_win32_surface_get_dc(CairoSurface());
  79 }
  80
  81 already_AddRefed<gfxImageSurface> gfxWindowsSurface::GetAsImageSurface() {
  82   if (!mSurfaceValid) {
  83     NS_WARNING(
  84         "GetImageSurface on an invalid (null) surface; who's calling this "
  85         "without checking for surface errors?");
  86     return nullptr;
  87   }
  88
  89   NS_ASSERTION(
  90       CairoSurface() != nullptr,
  91       "CairoSurface() shouldn't be nullptr when mSurfaceValid is TRUE!");
  92
  93   cairo_surface_t* isurf = cairo_win32_surface_get_image(CairoSurface());
  94   if (!isurf) return nullptr;
  95
  96   RefPtr<gfxImageSurface> result =
  97       gfxASurface::Wrap(isurf).downcast<gfxImageSurface>();
  98   result->SetOpaqueRect(GetOpaqueRect());
  99
 100   return result.forget();
 101 }
 102
 103 const mozilla::gfx::IntSize gfxWindowsSurface::GetSize() const {
 104   if (!mSurfaceValid) {
 105     NS_WARNING(
 106         "GetImageSurface on an invalid (null) surface; who's calling this "
 107         "without checking for surface errors?");
 108     return mozilla::gfx::IntSize(-1, -1);
 109   }
 110
 111   NS_ASSERTION(
 112       mSurface != nullptr,
 113       "CairoSurface() shouldn't be nullptr when mSurfaceValid is TRUE!");
 114
 115   int width, height;
 116   if (cairo_win32_surface_get_size(mSurface, &width, &height) !=
 117       CAIRO_STATUS_SUCCESS) {
 118     return mozilla::gfx::IntSize(-1, -1);
 119   }
 120
 121   return mozilla::gfx::IntSize(width, height);
 122 }