ReactOS  0.4.12-dev-712-ge6be187
alphablend.c
Go to the documentation of this file.
1 /*
2  * COPYRIGHT: See COPYING in the top level directory
3  * PROJECT: ReactOS kernel
4  * PURPOSE: GDI alpha blending functions
5  * FILE: win32ss/gdi/eng/alphablend.c
6  * PROGRAMER: Jason Filby
7  */
8 
9 #include <win32k.h>
10 
11 #define NDEBUG
12 #include <debug.h>
13 
14 
15 /*
16  * @implemented
17  */
18 BOOL
21  _Inout_ SURFOBJ *psoDest,
22  _In_ SURFOBJ *psoSource,
23  _In_opt_ CLIPOBJ *ClipRegion,
24  _In_opt_ XLATEOBJ *ColorTranslation,
25  _In_ RECTL *DestRect,
26  _In_ RECTL *SourceRect,
27  _In_ BLENDOBJ *BlendObj)
28 {
29  RECTL InputRect;
30  RECTL OutputRect;
31  RECTL ClipRect;
32  RECTL CombinedRect;
33  RECTL Rect;
34  POINTL Translate;
35  INTENG_ENTER_LEAVE EnterLeaveSource;
36  INTENG_ENTER_LEAVE EnterLeaveDest;
37  SURFOBJ* InputObj;
38  SURFOBJ* OutputObj;
39  LONG ClippingType;
40  RECT_ENUM RectEnum;
41  BOOL EnumMore;
42  ULONG i;
43  BOOLEAN Ret;
44 
45  DPRINT("EngAlphaBlend(psoDest:0x%p, psoSource:0x%p, ClipRegion:0x%p, ColorTranslation:0x%p,\n", psoDest, psoSource, ClipRegion, ColorTranslation);
46  DPRINT(" DestRect:{0x%x, 0x%x, 0x%x, 0x%x}, SourceRect:{0x%x, 0x%x, 0x%x, 0x%x},\n",
47  DestRect->left, DestRect->top, DestRect->right, DestRect->bottom,
48  SourceRect->left, SourceRect->top, SourceRect->right, SourceRect->bottom);
49  DPRINT(" BlendObj:{0x%x, 0x%x, 0x%x, 0x%x}\n", BlendObj->BlendFunction.BlendOp,
50  BlendObj->BlendFunction.BlendFlags, BlendObj->BlendFunction.SourceConstantAlpha,
51  BlendObj->BlendFunction.AlphaFormat);
52 
53  /* Validate output */
54  OutputRect = *DestRect;
55  RECTL_vMakeWellOrdered(&OutputRect);
56 
57  /* Validate input */
58  InputRect = *SourceRect;
59  RECTL_vMakeWellOrdered(&InputRect);
60  if ( (InputRect.top < 0) || (InputRect.bottom < 0) ||
61  (InputRect.left < 0) || (InputRect.right < 0) ||
62  InputRect.right > psoSource->sizlBitmap.cx ||
63  InputRect.bottom > psoSource->sizlBitmap.cy )
64  {
66  return FALSE;
67  }
68 
69  if (psoDest == psoSource &&
70  !(OutputRect.left >= SourceRect->right || InputRect.left >= OutputRect.right ||
71  OutputRect.top >= SourceRect->bottom || InputRect.top >= OutputRect.bottom))
72  {
73  DPRINT1("Source and destination rectangles overlap!\n");
74  return FALSE;
75  }
76 
77  if (BlendObj->BlendFunction.BlendOp != AC_SRC_OVER)
78  {
79  DPRINT1("BlendOp != AC_SRC_OVER (0x%x)\n", BlendObj->BlendFunction.BlendOp);
80  return FALSE;
81  }
82  if (BlendObj->BlendFunction.BlendFlags != 0)
83  {
84  DPRINT1("BlendFlags != 0 (0x%x)\n", BlendObj->BlendFunction.BlendFlags);
85  return FALSE;
86  }
87  if ((BlendObj->BlendFunction.AlphaFormat & ~AC_SRC_ALPHA) != 0)
88  {
89  DPRINT1("Unsupported AlphaFormat (0x%x)\n", BlendObj->BlendFunction.AlphaFormat);
90  return FALSE;
91  }
92 
93  /* Check if there is anything to draw */
94  if (ClipRegion != NULL &&
95  (ClipRegion->rclBounds.left >= ClipRegion->rclBounds.right ||
96  ClipRegion->rclBounds.top >= ClipRegion->rclBounds.bottom))
97  {
98  /* Nothing to do */
99  return TRUE;
100  }
101 
102  /* Now call the DIB function */
103  if (!IntEngEnter(&EnterLeaveSource, psoSource, &InputRect, TRUE, &Translate, &InputObj))
104  {
105  return FALSE;
106  }
107  InputRect.left += Translate.x;
108  InputRect.right += Translate.x;
109  InputRect.top += Translate.y;
110  InputRect.bottom += Translate.y;
111 
112  if (!IntEngEnter(&EnterLeaveDest, psoDest, &OutputRect, FALSE, &Translate, &OutputObj))
113  {
114  return FALSE;
115  }
116  OutputRect.left += Translate.x;
117  OutputRect.right += Translate.x;
118  OutputRect.top += Translate.y;
119  OutputRect.bottom += Translate.y;
120 
121  ASSERT(InputRect.left <= InputRect.right && InputRect.top <= InputRect.bottom);
122 
123  Ret = FALSE;
124  ClippingType = (ClipRegion == NULL) ? DC_TRIVIAL : ClipRegion->iDComplexity;
125  switch (ClippingType)
126  {
127  case DC_TRIVIAL:
129  OutputObj, InputObj, &OutputRect, &InputRect, ClipRegion, ColorTranslation, BlendObj);
130  break;
131 
132  case DC_RECT:
133  ClipRect.left = ClipRegion->rclBounds.left + Translate.x;
134  ClipRect.right = ClipRegion->rclBounds.right + Translate.x;
135  ClipRect.top = ClipRegion->rclBounds.top + Translate.y;
136  ClipRect.bottom = ClipRegion->rclBounds.bottom + Translate.y;
137  if (RECTL_bIntersectRect(&CombinedRect, &OutputRect, &ClipRect))
138  {
139  /* take into acount clipping results when calculating new input rect (scaled to input rect size) */
140  Rect.left = InputRect.left + (CombinedRect.left - OutputRect.left) * (InputRect.right - InputRect.left) / (OutputRect.right - OutputRect.left);
141  Rect.right = InputRect.right + (CombinedRect.right - OutputRect.right) * (InputRect.right - InputRect.left) / (OutputRect.right - OutputRect.left);
142  Rect.top = InputRect.top + (CombinedRect.top - OutputRect.top) * (InputRect.bottom - InputRect.top) / (OutputRect.bottom - OutputRect.top);
143  Rect.bottom = InputRect.bottom + (CombinedRect.bottom - OutputRect.bottom) * (InputRect.bottom - InputRect.top) / (OutputRect.bottom - OutputRect.top);
144 
145  /* Aplha blend one rect */
147  OutputObj, InputObj, &CombinedRect, &Rect, ClipRegion, ColorTranslation, BlendObj);
148  }
149  break;
150 
151  case DC_COMPLEX:
152  Ret = TRUE;
153  CLIPOBJ_cEnumStart(ClipRegion, FALSE, CT_RECTANGLES, CD_ANY, 0);
154  do
155  {
156  EnumMore = CLIPOBJ_bEnum(ClipRegion,(ULONG) sizeof(RectEnum),
157  (PVOID) &RectEnum);
158 
159  for (i = 0; i < RectEnum.c; i++)
160  {
161  ClipRect.left = RectEnum.arcl[i].left + Translate.x;
162  ClipRect.right = RectEnum.arcl[i].right + Translate.x;
163  ClipRect.top = RectEnum.arcl[i].top + Translate.y;
164  ClipRect.bottom = RectEnum.arcl[i].bottom + Translate.y;
165  if (RECTL_bIntersectRect(&CombinedRect, &OutputRect, &ClipRect))
166  {
167  /* take into acount clipping results when calculating new input rect (scaled to input rect size) */
168  Rect.left = InputRect.left + (CombinedRect.left - OutputRect.left) * (InputRect.right - InputRect.left) / (OutputRect.right - OutputRect.left);
169  Rect.right = InputRect.right + (CombinedRect.right - OutputRect.right) * (InputRect.right - InputRect.left) / (OutputRect.right - OutputRect.left);
170  Rect.top = InputRect.top + (CombinedRect.top - OutputRect.top) * (InputRect.bottom - InputRect.top) / (OutputRect.bottom - OutputRect.top);
171  Rect.bottom = InputRect.bottom + (CombinedRect.bottom - OutputRect.bottom) * (InputRect.bottom - InputRect.top) / (OutputRect.bottom - OutputRect.top);
172 
173  /* Alpha blend one rect */
175  OutputObj, InputObj, &CombinedRect, &Rect, ClipRegion, ColorTranslation, BlendObj) && Ret;
176  }
177  }
178  }
179  while (EnumMore);
180  break;
181 
182  default:
184  ASSERT(FALSE);
185  break;
186  }
187 
188  IntEngLeave(&EnterLeaveDest);
189  IntEngLeave(&EnterLeaveSource);
190 
191  return Ret;
192 }
193 
194 BOOL
195 APIENTRY
197  _Inout_ SURFOBJ *psoDest,
198  _In_ SURFOBJ *psoSource,
202  _In_ RECTL *prclSrc,
204 {
205  BOOL ret = FALSE;
206  SURFACE *psurfDest;
207 
208  ASSERT(psoDest);
209  ASSERT(psoSource);
210  ASSERT(prclDest);
211  ASSERT(prclSrc);
212  //ASSERT(pBlendObj);
213 
214  /* If no clip object is given, use trivial one */
215  if (!pco) pco = (CLIPOBJ *)&gxcoTrivial;
216 
217  /* Check if there is anything to draw */
218  if ((pco->rclBounds.left >= pco->rclBounds.right) ||
219  (pco->rclBounds.top >= pco->rclBounds.bottom))
220  {
221  /* Nothing to do */
222  return TRUE;
223  }
224 
225  psurfDest = CONTAINING_RECORD(psoDest, SURFACE, SurfObj);
226 
227  /* Call the driver's DrvAlphaBlend if available */
228  if (psurfDest->flags & HOOK_ALPHABLEND)
229  {
230  ret = GDIDEVFUNCS(psoDest).AlphaBlend(
231  psoDest, psoSource, pco, pxlo,
233  }
234 
235  if (!ret)
236  {
237  ret = EngAlphaBlend(psoDest, psoSource, pco, pxlo,
239  }
240 
241  return ret;
242 }
243 
244 /*
245  * @implemented
246  */
247 BOOL
248 APIENTRY
250  IN SURFOBJ *psoSource,
251  IN CLIPOBJ *ClipRegion,
252  IN XLATEOBJ *ColorTranslation,
253  IN PRECTL upDestRect,
254  IN PRECTL upSourceRect,
255  IN BLENDOBJ *BlendObj)
256 {
257  RECTL DestRect;
258  RECTL SourceRect;
259 
260  _SEH2_TRY
261  {
262  ProbeForRead(upDestRect, sizeof(RECTL), 1);
263  RtlCopyMemory(&DestRect,upDestRect, sizeof(RECTL));
264 
265  ProbeForRead(upSourceRect, sizeof(RECTL), 1);
266  RtlCopyMemory(&SourceRect, upSourceRect, sizeof(RECTL));
267 
268  }
270  {
271  _SEH2_YIELD(return FALSE);
272  }
273  _SEH2_END;
274 
275  return EngAlphaBlend(psoDest, psoSource, ClipRegion, ColorTranslation, &DestRect, &SourceRect, BlendObj);
276 }
277 
#define ERROR_INVALID_PARAMETER
Definition: compat.h:91
BOOL APIENTRY IntEngAlphaBlend(_Inout_ SURFOBJ *psoDest, _In_ SURFOBJ *psoSource, _In_opt_ CLIPOBJ *pco, _In_opt_ XLATEOBJ *pxlo, _In_ RECTL *prclDest, _In_ RECTL *prclSrc, _In_ BLENDOBJ *pBlendObj)
Definition: alphablend.c:196
#define IN
Definition: typedefs.h:38
#define TRUE
Definition: types.h:120
NTSYSAPI VOID NTAPI RtlCopyMemory(VOID UNALIGNED *Destination, CONST VOID UNALIGNED *Source, ULONG Length)
XCLIPOBJ gxcoTrivial
Definition: bitblt.c:15
#define DC_TRIVIAL
Definition: winddi.h:259
long bottom
Definition: polytest.cpp:53
ULONG iBitmapFormat
Definition: winddi.h:1215
#define AC_SRC_ALPHA
Definition: alphablend.c:9
#define _In_opt_
Definition: no_sal2.h:213
LONG y
Definition: windef.h:315
_SEH2_TRY
Definition: create.c:4250
PFN_DIB_AlphaBlend DIB_AlphaBlend
Definition: dib.h:54
#define HOOK_ALPHABLEND
Definition: winddi.h:1435
long right
Definition: polytest.cpp:53
GLsizei GLenum const GLvoid GLsizei GLenum GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLint GLint GLint GLshort GLshort GLshort GLubyte GLubyte GLubyte GLuint GLuint GLuint GLushort GLushort GLushort GLbyte GLbyte GLbyte GLbyte GLdouble GLdouble GLdouble GLdouble GLfloat GLfloat GLfloat GLfloat GLint GLint GLint GLint GLshort GLshort GLshort GLshort GLubyte GLubyte GLubyte GLubyte GLuint GLuint GLuint GLuint GLushort GLushort GLushort GLushort GLboolean const GLdouble const GLfloat const GLint const GLshort const GLbyte const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLdouble const GLfloat const GLfloat const GLint const GLint const GLshort const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort const GLdouble const GLfloat const GLint const GLshort GLenum GLenum GLenum GLfloat GLenum GLint GLenum GLenum GLenum GLfloat GLenum GLenum GLint GLenum GLfloat GLenum GLint GLint GLushort GLenum GLenum GLfloat GLenum GLenum GLint GLfloat const GLubyte GLenum GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLint GLint GLsizei GLsizei GLint GLenum GLenum const GLvoid GLenum GLenum const GLfloat GLenum GLenum const GLint GLenum GLenum const GLdouble GLenum GLenum const GLfloat GLenum GLenum const GLint GLsizei GLuint GLfloat GLuint GLbitfield GLfloat GLint GLuint GLboolean GLenum GLfloat GLenum GLbitfield GLenum GLfloat GLfloat GLint GLint const GLfloat GLenum GLfloat GLfloat GLint GLint GLfloat GLfloat GLint GLint const GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat GLint GLfloat GLfloat const GLdouble const GLfloat const GLdouble const GLfloat GLint i
Definition: glfuncs.h:248
long LONG
Definition: pedump.c:60
long top
Definition: polytest.cpp:53
#define EXCEPTION_EXECUTE_HANDLER
Definition: excpt.h:85
unsigned char BOOLEAN
smooth NULL
Definition: ftsmooth.c:416
#define CT_RECTANGLES
Definition: winddi.h:1317
void DPRINT(...)
Definition: polytest.cpp:61
switch(r->id)
Definition: btrfs.c:2691
BOOL APIENTRY NtGdiEngAlphaBlend(IN SURFOBJ *psoDest, IN SURFOBJ *psoSource, IN CLIPOBJ *ClipRegion, IN XLATEOBJ *ColorTranslation, IN PRECTL upDestRect, IN PRECTL upSourceRect, IN BLENDOBJ *BlendObj)
Definition: alphablend.c:249
long left
Definition: polytest.cpp:53
PFLT_MESSAGE_WAITER_QUEUE CONTAINING_RECORD(Csq, DEVICE_EXTENSION, IrpQueue)) -> WaiterQ.mLock) _IRQL_raises_(DISPATCH_LEVEL) VOID NTAPI FltpAcquireMessageWaiterLock(_In_ PIO_CSQ Csq, _Out_ PKIRQL Irql)
Definition: Messaging.c:560
_In_ SURFOBJ _In_ CLIPOBJ _In_opt_ XLATEOBJ _In_ RECTL _In_ RECTL * prclSrc
Definition: winddi.h:3414
#define DC_RECT
Definition: winddi.h:260
unsigned int BOOL
Definition: ntddk_ex.h:94
#define _SEH2_YIELD(STMT_)
Definition: pseh2_64.h:8
ENGAPI ULONG APIENTRY CLIPOBJ_cEnumStart(_Inout_ CLIPOBJ *pco, _In_ BOOL bAll, _In_ ULONG iType, _In_ ULONG iDirection, _In_ ULONG cLimit)
Definition: clip.c:255
#define GDIDEVFUNCS(SurfObj)
Definition: surface.h:106
BOOL FASTCALL RECTL_bIntersectRect(_Out_ RECTL *prclDst, _In_ const RECTL *prcl1, _In_ const RECTL *prcl2)
Definition: rect.c:55
LONG x
Definition: windef.h:314
#define _Inout_
Definition: no_sal2.h:244
_In_ SURFOBJ _In_ CLIPOBJ _In_opt_ XLATEOBJ _In_ RECTL * prclDest
Definition: winddi.h:3414
BOOL APIENTRY IntEngEnter(PINTENG_ENTER_LEAVE EnterLeave, SURFOBJ *psoDest, RECTL *DestRect, BOOL ReadOnly, POINTL *Translate, SURFOBJ **ppsoOutput)
Definition: engmisc.c:15
ASSERT((InvokeOnSuccess||InvokeOnError||InvokeOnCancel) ?(CompletionRoutine !=NULL) :TRUE)
int ret
VOID NTAPI ProbeForRead(IN CONST VOID *Address, IN SIZE_T Length, IN ULONG Alignment)
Definition: exintrin.c:102
#define AC_SRC_OVER
Definition: wingdi.h:1351
_In_ SURFOBJ _In_ CLIPOBJ * pco
Definition: winddi.h:3414
BOOL APIENTRY EngAlphaBlend(_Inout_ SURFOBJ *psoDest, _In_ SURFOBJ *psoSource, _In_opt_ CLIPOBJ *ClipRegion, _In_opt_ XLATEOBJ *ColorTranslation, _In_ RECTL *DestRect, _In_ RECTL *SourceRect, _In_ BLENDOBJ *BlendObj)
Definition: alphablend.c:20
#define _In_
Definition: no_sal2.h:204
#define DC_COMPLEX
Definition: winddi.h:261
_SEH2_END
Definition: create.c:4424
DIB_FUNCTIONS DibFunctionsForBitmapFormat[]
Definition: dib.c:20
_In_ SURFOBJ _In_ CLIPOBJ _In_opt_ XLATEOBJ _In_ RECTL _In_ RECTL _In_ BLENDOBJ * pBlendObj
Definition: winddi.h:3414
FLONG flags
Definition: surface.h:10
#define DPRINT1
Definition: precomp.h:8
unsigned int ULONG
Definition: retypes.h:1
#define UNIMPLEMENTED
Definition: debug.h:114
#define _SEH2_EXCEPT(...)
Definition: pseh2_64.h:6
BOOL APIENTRY IntEngLeave(PINTENG_ENTER_LEAVE EnterLeave)
Definition: engmisc.c:162
VOID FASTCALL RECTL_vMakeWellOrdered(_Inout_ RECTL *prcl)
Definition: rect.c:81
ENGAPI BOOL APIENTRY CLIPOBJ_bEnum(_In_ CLIPOBJ *pco, _In_ ULONG cj, _Out_bytecap_(cj) ULONG *pul)
Definition: clip.c:319
ENGAPI VOID APIENTRY EngSetLastError(_In_ ULONG iError)
Definition: error.c:27
#define APIENTRY
Definition: api.h:79
struct Rect Rect
#define CD_ANY
Definition: winddi.h:1326
_In_ SURFOBJ _In_ CLIPOBJ _In_opt_ XLATEOBJ * pxlo
Definition: winddi.h:3414