reactos/dll/win32/windowscodecs/clipper.c

   1 /*
   2  * Copyright 2013 Nikolay Sivov for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include "wincodecs_private.h"
  20
  21 typedef struct BitmapClipper {
  22     IWICBitmapClipper IWICBitmapClipper_iface;
  23     LONG ref;
  24     IWICBitmapSource *source;
  25     WICRect rect;
  26     CRITICAL_SECTION lock; /* must be held when initialized */
  27 } BitmapClipper;
  28
  29 static inline BitmapClipper *impl_from_IWICBitmapClipper(IWICBitmapClipper *iface)
  30 {
  31     return CONTAINING_RECORD(iface, BitmapClipper, IWICBitmapClipper_iface);
  32 }
  33
  34 static HRESULT WINAPI BitmapClipper_QueryInterface(IWICBitmapClipper *iface, REFIID iid,
  35     void **ppv)
  36 {
  37     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
  38     TRACE("(%p,%s,%p)\n", iface, debugstr_guid(iid), ppv);
  39
  40     if (!ppv) return E_INVALIDARG;
  41
  42     if (IsEqualIID(&IID_IUnknown, iid) ||
  43         IsEqualIID(&IID_IWICBitmapSource, iid) ||
  44         IsEqualIID(&IID_IWICBitmapClipper, iid))
  45     {
  46         *ppv = &This->IWICBitmapClipper_iface;
  47     }
  48     else
  49     {
  50         *ppv = NULL;
  51         return E_NOINTERFACE;
  52     }
  53
  54     IUnknown_AddRef((IUnknown*)*ppv);
  55     return S_OK;
  56 }
  57
  58 static ULONG WINAPI BitmapClipper_AddRef(IWICBitmapClipper *iface)
  59 {
  60     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
  61     ULONG ref = InterlockedIncrement(&This->ref);
  62
  63     TRACE("(%p) refcount=%u\n", iface, ref);
  64
  65     return ref;
  66 }
  67
  68 static ULONG WINAPI BitmapClipper_Release(IWICBitmapClipper *iface)
  69 {
  70     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
  71     ULONG ref = InterlockedDecrement(&This->ref);
  72
  73     TRACE("(%p) refcount=%u\n", iface, ref);
  74
  75     if (ref == 0)
  76     {
  77         This->lock.DebugInfo->Spare[0] = 0;
  78         DeleteCriticalSection(&This->lock);
  79         if (This->source) IWICBitmapSource_Release(This->source);
  80         HeapFree(GetProcessHeap(), 0, This);
  81     }
  82
  83     return ref;
  84 }
  85
  86 static HRESULT WINAPI BitmapClipper_GetSize(IWICBitmapClipper *iface,
  87     UINT *width, UINT *height)
  88 {
  89     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
  90
  91     TRACE("(%p,%p,%p)\n", iface, width, height);
  92
  93     if (!width || !height)
  94         return E_INVALIDARG;
  95
  96     if (!This->source)
  97         return WINCODEC_ERR_WRONGSTATE;
  98
  99     *width = This->rect.Width;
 100     *height = This->rect.Height;
 101
 102     return S_OK;
 103 }
 104
 105 static HRESULT WINAPI BitmapClipper_GetPixelFormat(IWICBitmapClipper *iface,
 106     WICPixelFormatGUID *format)
 107 {
 108     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
 109     TRACE("(%p,%p)\n", iface, format);
 110
 111     if (!format)
 112         return E_INVALIDARG;
 113
 114     if (!This->source)
 115         return WINCODEC_ERR_WRONGSTATE;
 116
 117     return IWICBitmapSource_GetPixelFormat(This->source, format);
 118 }
 119
 120 static HRESULT WINAPI BitmapClipper_GetResolution(IWICBitmapClipper *iface,
 121     double *dpiX, double *dpiY)
 122 {
 123     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
 124
 125     TRACE("(%p,%p,%p)\n", iface, dpiX, dpiY);
 126
 127     if (!dpiX || !dpiY)
 128         return E_INVALIDARG;
 129
 130     if (!This->source)
 131         return WINCODEC_ERR_WRONGSTATE;
 132
 133     return IWICBitmapSource_GetResolution(This->source, dpiX, dpiY);
 134 }
 135
 136 static HRESULT WINAPI BitmapClipper_CopyPalette(IWICBitmapClipper *iface,
 137     IWICPalette *palette)
 138 {
 139     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
 140
 141     TRACE("(%p,%p)\n", iface, palette);
 142
 143     if (!palette)
 144         return E_INVALIDARG;
 145
 146     if (!This->source)
 147         return WINCODEC_ERR_WRONGSTATE;
 148
 149     return IWICBitmapSource_CopyPalette(This->source, palette);
 150 }
 151
 152 static HRESULT WINAPI BitmapClipper_CopyPixels(IWICBitmapClipper *iface,
 153     const WICRect *rc, UINT stride, UINT buffer_size, BYTE *buffer)
 154 {
 155     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
 156     WICRect rect;
 157
 158     TRACE("(%p,%p,%u,%u,%p)\n", iface, rc, stride, buffer_size, buffer);
 159
 160     if (!This->source)
 161         return WINCODEC_ERR_WRONGSTATE;
 162
 163     if (rc)
 164     {
 165         rect = *rc;
 166
 167         /* transform to source coordinates */
 168         rect.X += This->rect.X;
 169         rect.Y += This->rect.Y;
 170
 171         if ((rect.X + rect.Width > This->rect.X + This->rect.Width) ||
 172             (rect.Y + rect.Height > This->rect.Y + This->rect.Height))
 173             return E_INVALIDARG;
 174
 175         rc = &rect;
 176     }
 177     else
 178         rc = &This->rect;
 179
 180     return IWICBitmapSource_CopyPixels(This->source, rc, stride, buffer_size, buffer);
 181 }
 182
 183 static HRESULT WINAPI BitmapClipper_Initialize(IWICBitmapClipper *iface,
 184     IWICBitmapSource *source, const WICRect *rc)
 185 {
 186     BitmapClipper *This = impl_from_IWICBitmapClipper(iface);
 187     UINT width, height;
 188     HRESULT hr = S_OK;
 189
 190     TRACE("(%p,%p,%p)\n", iface, source, rc);
 191
 192     EnterCriticalSection(&This->lock);
 193
 194     if (This->source)
 195     {
 196         hr = WINCODEC_ERR_WRONGSTATE;
 197         goto end;
 198     }
 199
 200     hr = IWICBitmapSource_GetSize(source, &width, &height);
 201     if (FAILED(hr)) goto end;
 202
 203     if  ((rc->X + rc->Width > width) || (rc->Y + rc->Height > height))
 204     {
 205         hr = E_INVALIDARG;
 206         goto end;
 207     }
 208
 209     This->rect = *rc;
 210     This->source = source;
 211     IWICBitmapSource_AddRef(This->source);
 212
 213 end:
 214     LeaveCriticalSection(&This->lock);
 215
 216     return hr;
 217 }
 218
 219 static const IWICBitmapClipperVtbl BitmapClipper_Vtbl = {
 220     BitmapClipper_QueryInterface,
 221     BitmapClipper_AddRef,
 222     BitmapClipper_Release,
 223     BitmapClipper_GetSize,
 224     BitmapClipper_GetPixelFormat,
 225     BitmapClipper_GetResolution,
 226     BitmapClipper_CopyPalette,
 227     BitmapClipper_CopyPixels,
 228     BitmapClipper_Initialize
 229 };
 230
 231 HRESULT BitmapClipper_Create(IWICBitmapClipper **clipper)
 232 {
 233     BitmapClipper *This;
 234
 235     This = HeapAlloc(GetProcessHeap(), 0, sizeof(BitmapClipper));
 236     if (!This) return E_OUTOFMEMORY;
 237
 238     This->IWICBitmapClipper_iface.lpVtbl = &BitmapClipper_Vtbl;
 239     This->ref = 1;
 240     This->source = NULL;
 241     InitializeCriticalSection(&This->lock);
 242     This->lock.DebugInfo->Spare[0] = (DWORD_PTR)(__FILE__ ": BitmapClipper.lock");
 243
 244     *clipper = &This->IWICBitmapClipper_iface;
 245
 246     return S_OK;
 247 }