Milestone 5: deliver embedded RDP sessions and lifecycle hardening

third_party/FreeRDP/libfreerdp/gdi/gdi.h

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+/**
+ * FreeRDP: A Remote Desktop Protocol Implementation
+ * GDI Library
+ *
+ * Copyright 2010-2011 Marc-Andre Moreau <marcandre.moreau@gmail.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *	 http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FREERDP_LIB_GDI_CORE_H
+#define FREERDP_LIB_GDI_CORE_H
+
+#include <winpr/cast.h>
+
+#include "graphics.h"
+#include "brush.h"
+
+#include <freerdp/api.h>
+
+WINPR_ATTR_NODISCARD
+FREERDP_LOCAL BOOL gdi_bitmap_update(rdpContext* context, const BITMAP_UPDATE* bitmapUpdate);
+
+FREERDP_LOCAL void gdi_bitmap_free_ex(gdiBitmap* bitmap);
+
+WINPR_ATTR_MALLOC(gdi_bitmap_free_ex, 1)
+WINPR_ATTR_NODISCARD
+FREERDP_LOCAL gdiBitmap* gdi_bitmap_new_ex(rdpGdi* gdi, int width, int height, int bpp, BYTE* data);
+
+WINPR_ATTR_NODISCARD
+static inline BYTE* gdi_get_bitmap_pointer(HGDI_DC hdcBmp, INT32 x, INT32 y)
+{
+	HGDI_BITMAP hBmp = (HGDI_BITMAP)hdcBmp->selectedObject;
+
+	if ((x >= 0) && (y >= 0) && (x < hBmp->width) && (y < hBmp->height))
+	{
+		BYTE* p = hBmp->data + (WINPR_ASSERTING_INT_CAST(size_t, y) * hBmp->scanline) +
+		          (WINPR_ASSERTING_INT_CAST(size_t, x) * FreeRDPGetBytesPerPixel(hdcBmp->format));
+		return p;
+	}
+	else
+	{
+		WLog_ERR(FREERDP_TAG("gdi"),
+		         "gdi_get_bitmap_pointer: requesting invalid pointer: (%" PRId32 ",%" PRId32
+		         ") in %" PRId32 "x%" PRId32 "",
+		         x, y, hBmp->width, hBmp->height);
+		return nullptr;
+	}
+}
+
+/**
+ * Get current color in brush bitmap according to dest coordinates. msdn{dd183396}
+ *
+ * @param x dest x-coordinate
+ * @param y dest y-coordinate
+ * @return color pointer
+ */
+WINPR_ATTR_NODISCARD
+static inline BYTE* gdi_get_brush_pointer(HGDI_DC hdcBrush, UINT32 x, UINT32 y)
+{
+	BYTE* p = nullptr;
+	UINT32 brushStyle = gdi_GetBrushStyle(hdcBrush);
+
+	switch (brushStyle)
+	{
+		case GDI_BS_PATTERN:
+		case GDI_BS_HATCHED:
+		{
+			HGDI_BITMAP hBmpBrush = hdcBrush->brush->pattern;
+			/* According to msdn{dd183396}, the system always positions a brush bitmap
+			 * at the brush origin and copy across the client area.
+			 * Calculate the offset of the mapped pixel in the brush bitmap according to
+			 * brush origin and dest coordinates */
+			const UINT32 w = WINPR_ASSERTING_INT_CAST(UINT32, hBmpBrush->width);
+			const UINT32 h = WINPR_ASSERTING_INT_CAST(UINT32, hBmpBrush->height);
+
+			WINPR_ASSERT(w > 0);
+			WINPR_ASSERT(h > 0);
+			x = (x + w - (WINPR_ASSERTING_INT_CAST(UINT32, hdcBrush->brush->nXOrg) % w)) % w;
+			y = (y + h - (WINPR_ASSERTING_INT_CAST(UINT32, hdcBrush->brush->nYOrg) % h)) % h;
+			p = hBmpBrush->data + (1ULL * y * hBmpBrush->scanline) +
+			    (1ULL * x * FreeRDPGetBytesPerPixel(hBmpBrush->format));
+			return p;
+		}
+
+		default:
+			break;
+	}
+
+	p = (BYTE*)&(hdcBrush->textColor);
+	return p;
+}
+
+#endif /* FREERDP_LIB_GDI_CORE_H */