add cairo

1 files changed, 1416 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/src/cairo-os2-surface.c b/libs/cairo-1.16.0/src/cairo-os2-surface.c
new file mode 100644
index 0000000..84f08c8
--- /dev/null
+++ b/libs/cairo-1.16.0/src/cairo-os2-surface.c
@@ -0,0 +1,1416 @@
+/* vim: set sw=4 sts=4 et cin: */
+/* cairo - a vector graphics library with display and print output
+ *
+ * Copyright (c) 2005-2006 netlabs.org
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it either under the terms of the GNU Lesser General Public
+ * License version 2.1 as published by the Free Software Foundation
+ * (the "LGPL") or, at your option, under the terms of the Mozilla
+ * Public License Version 1.1 (the "MPL"). If you do not alter this
+ * notice, a recipient may use your version of this file under either
+ * the MPL or the LGPL.
+ *
+ * You should have received a copy of the LGPL along with this library
+ * in the file COPYING-LGPL-2.1; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Suite 500, Boston, MA 02110-1335, USA
+ * You should have received a copy of the MPL along with this library
+ * in the file COPYING-MPL-1.1
+ *
+ * The contents of this file are subject to the Mozilla Public License
+ * Version 1.1 (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.mozilla.org/MPL/
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY
+ * OF ANY KIND, either express or implied. See the LGPL or the MPL for
+ * the specific language governing rights and limitations.
+ *
+ * The Original Code is the cairo graphics library.
+ *
+ * The Initial Developer of the Original Code is
+ *     Doodle <doodle@scenergy.dfmk.hu>
+ *
+ * Contributor(s):
+ *     Peter Weilbacher <mozilla@Weilbacher.org>
+ *     Rich Walsh <dragtext@e-vertise.com>
+ */
+
+#include "cairoint.h"
+
+#include "cairo-os2-private.h"
+#include "cairo-default-context-private.h"
+#include "cairo-error-private.h"
+#include "cairo-surface-fallback-private.h"
+#include "cairo-image-surface-private.h"
+
+#if CAIRO_HAS_FC_FONT
+#include <fontconfig/fontconfig.h>
+#endif
+
+#include <float.h>
+#ifdef BUILD_CAIRO_DLL
+# include "cairo-os2.h"
+# ifndef __WATCOMC__
+#  include <emx/startup.h>
+# endif
+#endif
+
+/*
+ * Here comes the extra API for the OS/2 platform. Currently it consists
+ * of two extra functions, the cairo_os2_init() and the
+ * cairo_os2_fini(). Both of them are called automatically if
+ * Cairo is compiled to be a DLL file, but you have to call them before
+ * using the Cairo API if you link to Cairo statically!
+ *
+ * You'll also find the code in here which deals with DLL initialization
+ * and termination, if the code is built to be a DLL.
+ * (if BUILD_CAIRO_DLL is defined)
+ */
+
+/* Initialization counter: */
+static int cairo_os2_initialization_count = 0;
+
+static inline void
+DisableFPUException (void)
+{
+    unsigned short usCW;
+
+    /* Some OS/2 PM API calls modify the FPU Control Word,
+     * but forget to restore it.
+     *
+     * This can result in XCPT_FLOAT_INVALID_OPCODE exceptions,
+     * so to be sure, we disable Invalid Opcode FPU exception
+     * before using FPU stuffs.
+     */
+    usCW = _control87 (0, 0);
+    usCW = usCW | EM_INVALID | 0x80;
+    _control87 (usCW, MCW_EM | 0x80);
+}
+
+/**
+ * cairo_os2_init:
+ *
+ * Initializes the Cairo library. This function is automatically called if
+ * Cairo was compiled to be a DLL (however it's not a problem if it's called
+ * multiple times). But if you link to Cairo statically, you have to call it
+ * once to set up Cairo's internal structures and mutexes.
+ *
+ * Since: 1.4
+ **/
+cairo_public void
+cairo_os2_init (void)
+{
+    /* This may initialize some stuffs, like create mutex semaphores etc.. */
+
+    cairo_os2_initialization_count++;
+    if (cairo_os2_initialization_count > 1) return;
+
+    DisableFPUException ();
+
+#if CAIRO_HAS_FC_FONT
+    /* Initialize FontConfig */
+    FcInit ();
+#endif
+
+    CAIRO_MUTEX_INITIALIZE ();
+}
+
+/**
+ * cairo_os2_fini:
+ *
+ * Uninitializes the Cairo library. This function is automatically called if
+ * Cairo was compiled to be a DLL (however it's not a problem if it's called
+ * multiple times). But if you link to Cairo statically, you have to call it
+ * once to shut down Cairo, to let it free all the resources it has allocated.
+ *
+ * Since: 1.4
+ **/
+cairo_public void
+cairo_os2_fini (void)
+{
+    /* This has to uninitialize some stuffs, like destroy mutex semaphores etc.. */
+
+    if (cairo_os2_initialization_count <= 0) return;
+    cairo_os2_initialization_count--;
+    if (cairo_os2_initialization_count > 0) return;
+
+    DisableFPUException ();
+
+    cairo_debug_reset_static_data ();
+
+#if CAIRO_HAS_FC_FONT
+# if HAVE_FCFINI
+    /* Uninitialize FontConfig */
+    FcFini ();
+# endif
+#endif
+
+#ifdef __WATCOMC__
+    /* It can happen that the libraries we use have memory leaks,
+     * so there are still memory chunks allocated at this point.
+     * In these cases, Watcom might still have a bigger memory chunk,
+     * called "the heap" allocated from the OS.
+     * As we want to minimize the memory we lose from the point of
+     * view of the OS, we call this function to shrink that heap
+     * as much as possible.
+     */
+    _heapshrink ();
+#else
+    /* GCC has a heapmin function that approximately corresponds to
+     * what the Watcom function does
+     */
+    _heapmin ();
+#endif
+}
+
+/*
+ * This function calls the allocation function depending on which
+ * method was compiled into the library: it can be native allocation
+ * (DosAllocMem/DosFreeMem) or C-Library based allocation (malloc/free).
+ * Actually, for pixel buffers that we use this function for, cairo
+ * uses _cairo_malloc_abc, so we use that here, too. And use the
+ * change to check the size argument
+ */
+void *_buffer_alloc (size_t a, size_t b, const unsigned int size)
+{
+    size_t nbytes;
+    void  *buffer = NULL;
+
+    if (!a || !b || !size ||
+        a >= INT32_MAX / b || a*b >= INT32_MAX / size) {
+        return NULL;
+    }
+    nbytes = a * b * size;
+
+#ifdef OS2_USE_PLATFORM_ALLOC
+    /* Using OBJ_ANY on a machine that isn't configured for hi-mem
+     * will cause ERROR_INVALID_PARAMETER.  If this occurs, or this
+     * build doesn't have hi-mem enabled, fall back to using lo-mem.
+     */
+#ifdef OS2_HIGH_MEMORY
+    if (!DosAllocMem (&buffer, nbytes,
+                      OBJ_ANY | PAG_READ | PAG_WRITE | PAG_COMMIT))
+        return buffer;
+#endif
+    if (DosAllocMem (&buffer, nbytes,
+                     PAG_READ | PAG_WRITE | PAG_COMMIT))
+        return NULL;
+#else
+    /* Clear the malloc'd buffer the way DosAllocMem() does. */
+    buffer = _cairo_malloc (nbytes);
+    if (buffer) {
+        memset (buffer, 0, nbytes);
+    }
+#endif
+    return buffer;
+}
+
+/*
+ * This function selects the free function depending on which
+ * allocation method was compiled into the library
+ */
+void _buffer_free (void *buffer)
+{
+#ifdef OS2_USE_PLATFORM_ALLOC
+    DosFreeMem (buffer);
+#else
+    free (buffer);
+#endif
+}
+
+/* XXX
+ * The cairo_os2_ini() and cairo_os2_fini() functions should be removed and
+ * the LibMain code moved to cairo-system.c.  It should also call
+ * cairo_debug_reset_static_data() instead of duplicating its logic...
+ */
+
+#ifdef BUILD_CAIRO_DLL
+/* The main DLL entry for DLL initialization and uninitialization */
+/* Only include this code if we're about to build a DLL.          */
+
+#ifdef __WATCOMC__
+unsigned _System
+LibMain (unsigned hmod,
+         unsigned termination)
+#else
+unsigned long _System
+_DLL_InitTerm (unsigned long hModule,
+               unsigned long termination)
+#endif
+{
+    if (termination) {
+        /* Unloading the DLL */
+        cairo_os2_fini ();
+
+#ifndef __WATCOMC__
+        /* Uninitialize RTL of GCC */
+        __ctordtorTerm ();
+        _CRT_term ();
+#endif
+        return 1;
+    } else {
+        /* Loading the DLL */
+#ifndef __WATCOMC__
+        /* Initialize RTL of GCC */
+        if (_CRT_init () != 0)
+            return 0;
+        __ctordtorInit ();
+#endif
+
+        cairo_os2_init ();
+        return 1;
+    }
+}
+
+#endif /* BUILD_CAIRO_DLL */
+
+/*
+ * The following part of the source file contains the code which might
+ * be called the "core" of the OS/2 backend support. This contains the
+ * OS/2 surface support functions and structures.
+ */
+
+/* Forward declaration */
+static const cairo_surface_backend_t cairo_os2_surface_backend;
+
+/* Unpublished API:
+ *   GpiEnableYInversion = PMGPI.723
+ *   GpiQueryYInversion = PMGPI.726
+ *   BOOL APIENTRY GpiEnableYInversion (HPS hps, LONG lHeight);
+ *   LONG APIENTRY GpiQueryYInversion (HPS hps);
+ */
+BOOL APIENTRY GpiEnableYInversion (HPS hps, LONG lHeight);
+LONG APIENTRY GpiQueryYInversion (HPS hps);
+
+#ifdef __WATCOMC__
+/* Function declaration for GpiDrawBits () (missing from OpenWatcom headers) */
+LONG APIENTRY GpiDrawBits (HPS hps,
+                           PVOID pBits,
+                           PBITMAPINFO2 pbmiInfoTable,
+                           LONG lCount,
+                           PPOINTL aptlPoints,
+                           LONG lRop,
+                           ULONG flOptions);
+#endif
+
+static void
+_cairo_os2_surface_blit_pixels (cairo_os2_surface_t *surface,
+                                HPS                  hps_begin_paint,
+                                PRECTL               prcl_begin_paint_rect)
+{
+    POINTL aptlPoints[4];
+    LONG   lOldYInversion;
+    LONG   rc = GPI_OK;
+
+    /* Check the limits (may not be necessary) */
+    if (prcl_begin_paint_rect->xLeft < 0)
+        prcl_begin_paint_rect->xLeft = 0;
+    if (prcl_begin_paint_rect->yBottom < 0)
+        prcl_begin_paint_rect->yBottom = 0;
+    if (prcl_begin_paint_rect->xRight > (LONG) surface->bitmap_info.cx)
+        prcl_begin_paint_rect->xRight = (LONG) surface->bitmap_info.cx;
+    if (prcl_begin_paint_rect->yTop > (LONG) surface->bitmap_info.cy)
+        prcl_begin_paint_rect->yTop = (LONG) surface->bitmap_info.cy;
+
+    /* Exit if the rectangle is empty */
+    if (prcl_begin_paint_rect->xLeft   >= prcl_begin_paint_rect->xRight ||
+        prcl_begin_paint_rect->yBottom >= prcl_begin_paint_rect->yTop)
+        return;
+
+    /* Set the Target & Source coordinates */
+    *((PRECTL)&aptlPoints[0]) = *prcl_begin_paint_rect;
+    *((PRECTL)&aptlPoints[2]) = *prcl_begin_paint_rect;
+
+    /* Make the Target coordinates non-inclusive */
+    aptlPoints[1].x -= 1;
+    aptlPoints[1].y -= 1;
+
+    /* Enable Y Inversion for the HPS, so  GpiDrawBits will
+     * work with upside-top image, not with upside-down image!
+     */
+    lOldYInversion = GpiQueryYInversion (hps_begin_paint);
+    GpiEnableYInversion (hps_begin_paint, surface->bitmap_info.cy-1);
+
+    /* Debug code to draw rectangle limits */
+#if 0
+    {
+        int x, y;
+        unsigned char *pixels;
+
+        pixels = surface->pixels;
+        for (x = 0; x < surface->bitmap_info.cx; x++) {
+            for (y = 0; y < surface->bitmap_info.cy; y++) {
+                if ((x == 0) ||
+                    (y == 0) ||
+                    (x == y) ||
+                    (x >= surface->bitmap_info.cx-1) ||
+                    (y >= surface->bitmap_info.cy-1))
+                {
+                    pixels[y*surface->bitmap_info.cx*4+x*4] = 255;
+                }
+            }
+        }
+    }
+#endif
+    if (!surface->use_24bpp) {
+        rc = GpiDrawBits (hps_begin_paint,
+                          surface->pixels,
+                          &(surface->bitmap_info),
+                          4,
+                          aptlPoints,
+                          ROP_SRCCOPY,
+                          BBO_IGNORE);
+        if (rc != GPI_OK)
+            surface->use_24bpp = TRUE;
+    }
+
+    if (surface->use_24bpp) {
+        /* If GpiDrawBits () failed then this is most likely because the
+         * display driver could not handle a 32bit bitmap. So we need to
+         * - create a buffer that only contains 3 bytes per pixel
+         * - change the bitmap info header to contain 24bit
+         * - pass the new buffer to GpiDrawBits () again
+         * - clean up the new buffer
+         */
+        BITMAPINFO2       bmpinfo;
+        unsigned char    *pchPixBuf;
+        unsigned char    *pchTarget;
+        ULONG            *pulSource;
+        ULONG             ulX;
+        ULONG             ulY;
+        ULONG             ulPad;
+
+        /* Set up the bitmap header, but this time for 24bit depth. */
+        bmpinfo = surface->bitmap_info;
+        bmpinfo.cBitCount = 24;
+
+        /* The start of each row has to be DWORD aligned.  Calculate the
+         * of number aligned bytes per row, the total size of the bitmap,
+         * and the number of padding bytes at the end of each row.
+         */
+        ulX = (((bmpinfo.cx * bmpinfo.cBitCount) + 31) / 32) * 4;
+        bmpinfo.cbImage = ulX * bmpinfo.cy;
+        ulPad = ulX - bmpinfo.cx * 3;
+
+        /* Allocate temporary pixel buffer.  If the rows don't need
+         * padding, it has to be 1 byte larger than the size of the
+         * bitmap  or else the high-order byte from the last source
+         * row will end up in unallocated memory.
+         */
+        pchPixBuf = (unsigned char *)_buffer_alloc (1, 1,
+                                        bmpinfo.cbImage + (ulPad ? 0 : 1));
+
+        if (pchPixBuf) {
+            /* Copy 4 bytes from the source but advance the target ptr only
+             * 3 bytes, so the high-order alpha byte will be overwritten by
+             * the next copy. At the end of each row, skip over the padding.
+             */
+            pchTarget = pchPixBuf;
+            pulSource = (ULONG*)surface->pixels;
+            for (ulY = bmpinfo.cy; ulY; ulY--) {
+                for (ulX = bmpinfo.cx; ulX; ulX--) {
+                    *((ULONG*)pchTarget) = *pulSource++;
+                    pchTarget += 3;
+                }
+                pchTarget += ulPad;
+            }
+
+            rc = GpiDrawBits (hps_begin_paint,
+                              pchPixBuf,
+                              &bmpinfo,
+                              4,
+                              aptlPoints,
+                              ROP_SRCCOPY,
+                              BBO_IGNORE);
+            if (rc != GPI_OK)
+                surface->use_24bpp = FALSE;
+
+            _buffer_free (pchPixBuf);
+        }
+    }
+
+    /* Restore Y inversion */
+    GpiEnableYInversion (hps_begin_paint, lOldYInversion);
+}
+
+static void
+_cairo_os2_surface_get_pixels_from_screen (cairo_os2_surface_t *surface,
+                                           HPS                  hps_begin_paint,
+                                           PRECTL               prcl_begin_paint_rect)
+{
+    HPS hps;
+    HDC hdc;
+    SIZEL sizlTemp;
+    HBITMAP hbmpTemp;
+    BITMAPINFO2 bmi2Temp;
+    POINTL aptlPoints[4];
+    int y;
+    unsigned char *pchTemp;
+
+    /* To copy pixels from screen to our buffer, we do the following steps:
+     *
+     * - Blit pixels from screen to a HBITMAP:
+     *   -- Create Memory Device Context
+     *   -- Create a PS into it
+     *   -- Create a HBITMAP
+     *   -- Select HBITMAP into memory PS
+     *   -- Blit dirty pixels from screen to HBITMAP
+     * - Copy HBITMAP lines (pixels) into our buffer
+     * - Free resources
+     */
+
+    /* Create a memory device context */
+    hdc = DevOpenDC (0, OD_MEMORY,"*",0L, NULL, NULLHANDLE);
+    if (!hdc) {
+        return;
+    }
+
+    /* Create a memory PS */
+    sizlTemp.cx = prcl_begin_paint_rect->xRight - prcl_begin_paint_rect->xLeft;
+    sizlTemp.cy = prcl_begin_paint_rect->yTop - prcl_begin_paint_rect->yBottom;
+    hps = GpiCreatePS (0,
+                       hdc,
+                       &sizlTemp,
+                       PU_PELS | GPIT_NORMAL | GPIA_ASSOC);
+    if (!hps) {
+        DevCloseDC (hdc);
+        return;
+    }
+
+    /* Create an uninitialized bitmap. */
+    /* Prepare BITMAPINFO2 structure for our buffer */
+    memset (&bmi2Temp, 0, sizeof (bmi2Temp));
+    bmi2Temp.cbFix = sizeof (BITMAPINFOHEADER2);
+    bmi2Temp.cx = sizlTemp.cx;
+    bmi2Temp.cy = sizlTemp.cy;
+    bmi2Temp.cPlanes = 1;
+    bmi2Temp.cBitCount = 32;
+
+    hbmpTemp = GpiCreateBitmap (hps,
+                                (PBITMAPINFOHEADER2) &bmi2Temp,
+                                0,
+                                NULL,
+                                NULL);
+
+    if (!hbmpTemp) {
+        GpiDestroyPS (hps);
+        DevCloseDC (hdc);
+        return;
+    }
+
+    /* Select the bitmap into the memory device context. */
+    GpiSetBitmap (hps, hbmpTemp);
+
+    /* Target coordinates (Noninclusive) */
+    aptlPoints[0].x = 0;
+    aptlPoints[0].y = 0;
+
+    aptlPoints[1].x = sizlTemp.cx;
+    aptlPoints[1].y = sizlTemp.cy;
+
+    /* Source coordinates (Inclusive) */
+    aptlPoints[2].x = prcl_begin_paint_rect->xLeft;
+    aptlPoints[2].y = surface->bitmap_info.cy - prcl_begin_paint_rect->yBottom;
+
+    aptlPoints[3].x = prcl_begin_paint_rect->xRight;
+    aptlPoints[3].y = surface->bitmap_info.cy - prcl_begin_paint_rect->yTop;
+
+    /* Blit pixels from screen to bitmap */
+    GpiBitBlt (hps,
+               hps_begin_paint,
+               4,
+               aptlPoints,
+               ROP_SRCCOPY,
+               BBO_IGNORE);
+
+    /* Now we have to extract the pixels from the bitmap. */
+    pchTemp =
+        surface->pixels +
+        (prcl_begin_paint_rect->yBottom)*surface->bitmap_info.cx*4 +
+        prcl_begin_paint_rect->xLeft*4;
+    for (y = 0; y < sizlTemp.cy; y++) {
+        /* Get one line of pixels */
+        GpiQueryBitmapBits (hps,
+                            sizlTemp.cy - y - 1, /* lScanStart */
+                            1,                   /* lScans */
+                            (PBYTE)pchTemp,
+                            &bmi2Temp);
+
+        /* Go for next line */
+        pchTemp += surface->bitmap_info.cx*4;
+    }
+
+    /* Clean up resources */
+    GpiSetBitmap (hps, (HBITMAP) NULL);
+    GpiDeleteBitmap (hbmpTemp);
+    GpiDestroyPS (hps);
+    DevCloseDC (hdc);
+}
+
+static cairo_status_t
+_cairo_os2_surface_acquire_source_image (void                   *abstract_surface,
+                                         cairo_image_surface_t **image_out,
+                                         void                  **image_extra)
+{
+    cairo_os2_surface_t *surface = (cairo_os2_surface_t *) abstract_surface;
+
+    DosRequestMutexSem (surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT);
+
+    /* Increase lend counter */
+    surface->pixel_array_lend_count++;
+
+    *image_out = surface->image_surface;
+    *image_extra = NULL;
+
+    DosReleaseMutexSem (surface->hmtx_use_private_fields);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static void
+_cairo_os2_surface_release_source_image (void                  *abstract_surface,
+                                         cairo_image_surface_t *image,
+                                         void                  *image_extra)
+{
+    cairo_os2_surface_t *surface = (cairo_os2_surface_t *) abstract_surface;
+
+    /* Decrease Lend counter! */
+    DosRequestMutexSem (surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT);
+
+    if (surface->pixel_array_lend_count > 0)
+        surface->pixel_array_lend_count--;
+    DosPostEventSem (surface->hev_pixel_array_came_back);
+
+    DosReleaseMutexSem (surface->hmtx_use_private_fields);
+}
+
+static cairo_image_surface_t *
+_cairo_os2_surface_map_to_image (void *abstract_surface,
+				 const cairo_rectangle_int_t *extents)
+{
+    cairo_os2_surface_t *surface = (cairo_os2_surface_t *) abstract_surface;
+
+    DosRequestMutexSem (surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT);
+    /* Increase lend counter */
+    surface->pixel_array_lend_count++;
+    DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+
+    /* XXX: BROKEN! */
+    *image_out = _cairo_surface_create_for_rectangle_int (surface->image_surface,
+							  extents);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_int_status_t
+_cairo_os2_surface_unmap_image (void *abstract_surface,
+				cairo_image_surface_t *image)
+{
+    cairo_os2_surface_t *surface = (cairo_os2_surface_t *) abstract_surface;
+
+    /* So, we got back the image, and if all goes well, then
+     * something has been changed inside the interest_rect.
+     * So, we blit it to the screen!
+     */
+    if (surface->blit_as_changes) {
+	RECTL rclToBlit;
+
+        /* Get mutex, we'll work with the pixel array! */
+        if (DosRequestMutexSem (surface->hmtx_use_private_fields,
+				SEM_INDEFINITE_WAIT) != NO_ERROR)
+	{
+            /* Could not get mutex! */
+            return;
+        }
+
+	rclToBlit.xLeft = image->base.device_transform_inverse.x0;
+	rclToBlit.xRight = rclToBlit.xLeft + image->width; /* Noninclusive */
+	rclToBlit.yTop = image->base.device_transform_inverse.y0;
+	rclToBlit.yBottom = rclToBlit.yTop + image->height; /* Noninclusive */
+
+        if (surface->hwnd_client_window) {
+            /* We know the HWND, so let's invalidate the window region,
+             * so the application will redraw itself, using the
+             * cairo_os2_surface_refresh_window () API from its own PM thread.
+             *
+             * This is the safe method, which should be preferred every time.
+             */
+	    rclToBlit.yTop = surface->bitmap_info.cy - rclToBlit.yTop;
+	    rclToBlit.yBottom = surface->bitmap_info.cy - rclToBlit.yTop;
+            WinInvalidateRect (surface->hwnd_client_window,
+                               &rclToBlit,
+                               FALSE);
+        } else {
+            /* We don't know the HWND, so try to blit the pixels from here!
+             * Please note that it can be problematic if this is not the PM thread!
+             *
+             * It can cause internal PM stuffs to be screwed up, for some reason.
+             * Please always tell the HWND to the surface using the
+             * cairo_os2_surface_set_hwnd () API, and call cairo_os2_surface_refresh_window ()
+             * from your WM_PAINT, if it's possible!
+             */
+            _cairo_os2_surface_blit_pixels (surface,
+                                            surface->hps_client_window,
+                                            &rclToBlit);
+        }
+
+        DosReleaseMutexSem (surface->hmtx_use_private_fields);
+    }
+    /* Also decrease Lend counter! */
+    DosRequestMutexSem (surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT);
+
+    if (surface->pixel_array_lend_count > 0)
+        surface->pixel_array_lend_count--;
+    DosPostEventSem (surface->hev_pixel_array_came_back);
+
+    DosReleaseMutexSem (surface->hmtx_use_private_fields);
+}
+
+static cairo_bool_t
+_cairo_os2_surface_get_extents (void                    *abstract_surface,
+                                cairo_rectangle_int_t   *rectangle)
+{
+    cairo_os2_surface_t *surface = (cairo_os2_surface_t *) abstract_surface;
+
+    rectangle->x = 0;
+    rectangle->y = 0;
+    rectangle->width  = surface->bitmap_info.cx;
+    rectangle->height = surface->bitmap_info.cy;
+
+    return TRUE;
+}
+
+/**
+ * cairo_os2_surface_create:
+ * @hps_client_window: the presentation handle to bind the surface to
+ * @width: the width of the surface
+ * @height: the height of the surface
+ *
+ * Create a Cairo surface which is bound to a given presentation space (HPS).
+ * The caller retains ownership of the HPS and must dispose of it after the
+ * the surface has been destroyed.  The surface will be created to have the
+ * given size. By default every change to the surface will be made visible
+ * immediately by blitting it into the window. This can be changed with
+ * cairo_os2_surface_set_manual_window_refresh().
+ * Note that the surface will contain garbage when created, so the pixels
+ * have to be initialized by hand first. You can use the Cairo functions to
+ * fill it with black, or use cairo_surface_mark_dirty() to fill the surface
+ * with pixels from the window/HPS.
+ *
+ * Return value: the newly created surface
+ *
+ * Since: 1.4
+ **/
+cairo_surface_t *
+cairo_os2_surface_create (HPS hps_client_window,
+                          int width,
+                          int height)
+{
+    cairo_os2_surface_t *local_os2_surface = 0;
+    cairo_status_t status;
+    int rc;
+
+    /* Check the size of the window */
+    if ((width <= 0) || (height <= 0)) {
+        status = _cairo_error (CAIRO_STATUS_INVALID_SIZE);
+        goto error_exit;
+    }
+
+    /* Allocate an OS/2 surface structure. */
+    local_os2_surface = (cairo_os2_surface_t *) _cairo_malloc (sizeof (cairo_os2_surface_t));
+    if (!local_os2_surface) {
+        status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+        goto error_exit;
+    }
+
+    memset(local_os2_surface, 0, sizeof(cairo_os2_surface_t));
+
+    /* Allocate resources:  mutex & event semaphores and the pixel buffer */
+    if (DosCreateMutexSem (NULL,
+                           &(local_os2_surface->hmtx_use_private_fields),
+                           0,
+                           FALSE))
+    {
+        status = _cairo_error (CAIRO_STATUS_DEVICE_ERROR);
+        goto error_exit;
+    }
+
+    if (DosCreateEventSem (NULL,
+                           &(local_os2_surface->hev_pixel_array_came_back),
+                           0,
+                           FALSE))
+    {
+        status = _cairo_error (CAIRO_STATUS_DEVICE_ERROR);
+        goto error_exit;
+    }
+
+    local_os2_surface->pixels = (unsigned char *) _buffer_alloc (height, width, 4);
+    if (!local_os2_surface->pixels) {
+        status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+        goto error_exit;
+    }
+
+    /* Create image surface from pixel array */
+    local_os2_surface->image_surface = (cairo_image_surface_t *)
+        cairo_image_surface_create_for_data (local_os2_surface->pixels,
+                                             CAIRO_FORMAT_ARGB32,
+                                             width,      /* Width */
+                                             height,     /* Height */
+                                             width * 4); /* Rowstride */
+    status = local_os2_surface->image_surface->base.status;
+    if (status)
+        goto error_exit;
+
+    /* Set values for OS/2-specific data that aren't zero/NULL/FALSE.
+     * Note: hps_client_window may be null if this was called by
+     * cairo_os2_surface_create_for_window().
+     */
+    local_os2_surface->hps_client_window = hps_client_window;
+    local_os2_surface->blit_as_changes = TRUE;
+
+    /* Prepare BITMAPINFO2 structure for our buffer */
+    local_os2_surface->bitmap_info.cbFix = sizeof (BITMAPINFOHEADER2);
+    local_os2_surface->bitmap_info.cx = width;
+    local_os2_surface->bitmap_info.cy = height;
+    local_os2_surface->bitmap_info.cPlanes = 1;
+    local_os2_surface->bitmap_info.cBitCount = 32;
+
+    /* Initialize base surface */
+    _cairo_surface_init (&local_os2_surface->base,
+                         &cairo_os2_surface_backend,
+                         NULL, /* device */
+                         _cairo_content_from_format (CAIRO_FORMAT_ARGB32),
+			 FALSE); /* is_vector */
+
+    /* Successful exit */
+    return (cairo_surface_t *)local_os2_surface;
+
+ error_exit:
+
+    /* This point will only be reached if an error occurred */
+
+    if (local_os2_surface) {
+        if (local_os2_surface->pixels)
+            _buffer_free (local_os2_surface->pixels);
+        if (local_os2_surface->hev_pixel_array_came_back)
+            DosCloseEventSem (local_os2_surface->hev_pixel_array_came_back);
+        if (local_os2_surface->hmtx_use_private_fields)
+            DosCloseMutexSem (local_os2_surface->hmtx_use_private_fields);
+        free (local_os2_surface);
+    }
+
+    return _cairo_surface_create_in_error (status);
+}
+
+/**
+ * cairo_os2_surface_create_for_window:
+ * @hwnd_client_window: the window handle to bind the surface to
+ * @width: the width of the surface
+ * @height: the height of the surface
+ *
+ * Create a Cairo surface which is bound to a given window; the caller retains
+ * ownership of the window.  This is a convenience function for use with
+ * windows that will only be updated when cairo_os2_surface_refresh_window()
+ * is called (usually in response to a WM_PAINT message).  It avoids the need
+ * to create a persistent HPS for every window and assumes that one will be
+ * supplied by the caller when a cairo function needs one.  If it isn't, an
+ * HPS will be created on-the-fly and released before the function which needs
+ * it returns.
+ *
+ * Return value: the newly created surface
+ *
+ * Since: 1.10
+ **/
+cairo_surface_t *
+cairo_os2_surface_create_for_window (HWND hwnd_client_window,
+                                     int width,
+                                     int height)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    /* A window handle must be provided. */
+    if (!hwnd_client_window) {
+        return _cairo_surface_create_in_error (
+                                _cairo_error (CAIRO_STATUS_NO_MEMORY));
+    }
+
+    /* Create the surface. */
+    local_os2_surface = (cairo_os2_surface_t *)
+        cairo_os2_surface_create (0, width, height);
+
+    /* If successful, save the hwnd & turn off automatic repainting. */
+    if (!local_os2_surface->image_surface->base.status) {
+        local_os2_surface->hwnd_client_window = hwnd_client_window;
+        local_os2_surface->blit_as_changes = FALSE;
+    }
+
+    return (cairo_surface_t *)local_os2_surface;
+}
+
+/**
+ * cairo_os2_surface_set_size:
+ * @surface: the cairo surface to resize
+ * @new_width: the new width of the surface
+ * @new_height: the new height of the surface
+ * @timeout: timeout value in milliseconds
+ *
+ * When the client window is resized, call this API to set the new size in the
+ * underlying surface accordingly. This function will reallocate everything,
+ * so you'll have to redraw everything in the surface after this call.
+ * The surface will contain garbage after the resizing. So the notes of
+ * cairo_os2_surface_create() apply here, too.
+ *
+ * The timeout value specifies how long the function should wait on other parts
+ * of the program to release the buffers. It is necessary, because it can happen
+ * that Cairo is just drawing something into the surface while we want to
+ * destroy and recreate it.
+ *
+ * Return value: %CAIRO_STATUS_SUCCESS if the surface could be resized,
+ * %CAIRO_STATUS_SURFACE_TYPE_MISMATCH if the surface is not an OS/2 surface,
+ * %CAIRO_STATUS_INVALID_SIZE for invalid sizes
+ * %CAIRO_STATUS_NO_MEMORY if the new size could not be allocated, or if the
+ * timeout happened before all the buffers were released
+ *
+ * Since: 1.4
+ **/
+int
+cairo_os2_surface_set_size (cairo_surface_t *surface,
+                            int              new_width,
+                            int              new_height,
+                            int              timeout)
+{
+    cairo_os2_surface_t *local_os2_surface;
+    unsigned char *pchNewPixels;
+    int rc;
+    cairo_image_surface_t *pNewImageSurface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
+    }
+
+    if ((new_width <= 0) ||
+        (new_height <= 0))
+    {
+        /* Invalid size! */
+        return _cairo_error (CAIRO_STATUS_INVALID_SIZE);
+    }
+
+    /* Allocate memory for new stuffs */
+    pchNewPixels = (unsigned char *) _buffer_alloc (new_height, new_width, 4);
+    if (!pchNewPixels) {
+        /* Not enough memory for the pixels!
+         * Everything remains the same!
+         */
+        return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    }
+
+    /* Create image surface from new pixel array */
+    pNewImageSurface = (cairo_image_surface_t *)
+        cairo_image_surface_create_for_data (pchNewPixels,
+                                             CAIRO_FORMAT_ARGB32,
+                                             new_width,      /* Width */
+                                             new_height,     /* Height */
+                                             new_width * 4); /* Rowstride */
+
+    if (pNewImageSurface->base.status) {
+        /* Could not create image surface!
+         * Everything remains the same!
+         */
+        _buffer_free (pchNewPixels);
+        return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    }
+
+    /* Okay, new memory allocated, so it's time to swap old buffers
+     * to new ones!
+     */
+    if (DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT)!=NO_ERROR) {
+        /* Could not get mutex!
+         * Everything remains the same!
+         */
+        cairo_surface_destroy ((cairo_surface_t *) pNewImageSurface);
+        _buffer_free (pchNewPixels);
+        return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+    }
+
+    /* We have to make sure that we won't destroy a surface which
+     * is lent to some other code (Cairo is drawing into it)!
+     */
+    while (local_os2_surface->pixel_array_lend_count > 0) {
+        ULONG ulPostCount;
+        DosResetEventSem (local_os2_surface->hev_pixel_array_came_back, &ulPostCount);
+        DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+        /* Wait for somebody to return the pixels! */
+        rc = DosWaitEventSem (local_os2_surface->hev_pixel_array_came_back, timeout);
+        if (rc != NO_ERROR) {
+            /* Either timeout or something wrong... Exit. */
+            cairo_surface_destroy ((cairo_surface_t *) pNewImageSurface);
+            _buffer_free (pchNewPixels);
+            return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+        }
+        /* Okay, grab mutex and check counter again! */
+        if (DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT)
+            != NO_ERROR)
+        {
+            /* Could not get mutex!
+             * Everything remains the same!
+             */
+            cairo_surface_destroy ((cairo_surface_t *) pNewImageSurface);
+            _buffer_free (pchNewPixels);
+            return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+        }
+    }
+
+    /* Destroy old image surface */
+    cairo_surface_destroy ((cairo_surface_t *) (local_os2_surface->image_surface));
+    /* Destroy old pixel buffer */
+    _buffer_free (local_os2_surface->pixels);
+    /* Set new image surface */
+    local_os2_surface->image_surface = pNewImageSurface;
+    /* Set new pixel buffer */
+    local_os2_surface->pixels = pchNewPixels;
+    /* Change bitmap2 structure */
+    local_os2_surface->bitmap_info.cx = new_width;
+    local_os2_surface->bitmap_info.cy = new_height;
+
+    DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+    return CAIRO_STATUS_SUCCESS;
+}
+
+/**
+ * cairo_os2_surface_refresh_window:
+ * @surface: the cairo surface to refresh
+ * @hps_begin_paint: the presentation handle of the window to refresh
+ * @prcl_begin_paint_rect: the rectangle to redraw
+ *
+ * This function can be used to force a repaint of a given area of the client
+ * window. It should usually be called from the WM_PAINT processing of the
+ * window procedure. However, it can be called any time a given part of the
+ * window has to be updated.
+ *
+ * The HPS and RECTL to be passed can be taken from the usual WinBeginPaint call
+ * of the window procedure, but you can also get the HPS using WinGetPS, and you
+ * can assemble your own update rectangle by hand.
+ * If hps_begin_paint is %NULL, the function will use the HPS passed into
+ * cairo_os2_surface_create(). If @prcl_begin_paint_rect is %NULL, the function
+ * will query the current window size and repaint the whole window.
+ *
+ * Cairo assumes that if you set the HWND to the surface using
+ * cairo_os2_surface_set_hwnd(), this function will be called by the application
+ * every time it gets a WM_PAINT for that HWND. If the HWND is set in the
+ * surface, Cairo uses this function to handle dirty areas too.
+ *
+ * Since: 1.4
+ **/
+void
+cairo_os2_surface_refresh_window (cairo_surface_t *surface,
+                                  HPS              hps_begin_paint,
+                                  PRECTL           prcl_begin_paint_rect)
+{
+    cairo_os2_surface_t *local_os2_surface;
+    RECTL rclTemp;
+    HPS hpsTemp = 0;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return;
+    }
+
+    /* If an HPS wasn't provided, see if we can get one. */
+    if (!hps_begin_paint) {
+        hps_begin_paint = local_os2_surface->hps_client_window;
+        if (!hps_begin_paint) {
+            if (local_os2_surface->hwnd_client_window) {
+                hpsTemp = WinGetPS(local_os2_surface->hwnd_client_window);
+                hps_begin_paint = hpsTemp;
+            }
+            /* No HPS & no way to get one, so exit */
+            if (!hps_begin_paint)
+                return;
+        }
+    }
+
+    if (prcl_begin_paint_rect == NULL) {
+        /* Update the whole window! */
+        rclTemp.xLeft = 0;
+        rclTemp.xRight = local_os2_surface->bitmap_info.cx;
+        rclTemp.yTop = local_os2_surface->bitmap_info.cy;
+        rclTemp.yBottom = 0;
+    } else {
+        /* Use the rectangle we got passed as parameter! */
+        rclTemp.xLeft = prcl_begin_paint_rect->xLeft;
+        rclTemp.xRight = prcl_begin_paint_rect->xRight;
+        rclTemp.yTop = local_os2_surface->bitmap_info.cy - prcl_begin_paint_rect->yBottom;
+        rclTemp.yBottom = local_os2_surface->bitmap_info.cy - prcl_begin_paint_rect->yTop ;
+    }
+
+    /* Get mutex, we'll work with the pixel array! */
+    if (DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT)
+        != NO_ERROR)
+    {
+        /* Could not get mutex! */
+        if (hpsTemp)
+            WinReleasePS(hpsTemp);
+        return;
+    }
+
+    if ((local_os2_surface->dirty_area_present) &&
+        (local_os2_surface->rcl_dirty_area.xLeft == rclTemp.xLeft) &&
+        (local_os2_surface->rcl_dirty_area.xRight == rclTemp.xRight) &&
+        (local_os2_surface->rcl_dirty_area.yTop == rclTemp.yTop) &&
+        (local_os2_surface->rcl_dirty_area.yBottom == rclTemp.yBottom))
+    {
+        /* Aha, this call was because of a dirty area, so in this case we
+         * have to blit the pixels from the screen to the surface!
+         */
+        local_os2_surface->dirty_area_present = FALSE;
+        _cairo_os2_surface_get_pixels_from_screen (local_os2_surface,
+                                                   hps_begin_paint,
+                                                   &rclTemp);
+    } else {
+        /* Okay, we have the surface, have the HPS
+         * (might be from WinBeginPaint () or from WinGetPS () )
+         * Now blit there the stuffs!
+         */
+        _cairo_os2_surface_blit_pixels (local_os2_surface,
+                                        hps_begin_paint,
+                                        &rclTemp);
+    }
+
+    DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+
+    if (hpsTemp)
+        WinReleasePS(hpsTemp);
+}
+
+static cairo_status_t
+_cairo_os2_surface_finish (void *abstract_surface)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) abstract_surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
+    }
+
+    DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT);
+
+    /* Destroy old image surface */
+    cairo_surface_destroy ((cairo_surface_t *) (local_os2_surface->image_surface));
+    /* Destroy old pixel buffer */
+    _buffer_free (local_os2_surface->pixels);
+    DosCloseMutexSem (local_os2_surface->hmtx_use_private_fields);
+    DosCloseEventSem (local_os2_surface->hev_pixel_array_came_back);
+
+    /* The memory itself will be free'd by the cairo_surface_destroy ()
+     * who called us.
+     */
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+/**
+ * cairo_os2_surface_set_hwnd:
+ * @surface: the cairo surface to associate with the window handle
+ * @hwnd_client_window: the window handle of the client window
+ *
+ * Sets window handle for surface; the caller retains ownership of the window.
+ * If Cairo wants to blit into the window because it is set to blit as the
+ * surface changes (see cairo_os2_surface_set_manual_window_refresh()), then
+ * there are two ways it can choose:
+ * If it knows the HWND of the surface, then it invalidates that area, so the
+ * application will get a WM_PAINT message and it can call
+ * cairo_os2_surface_refresh_window() to redraw that area. Otherwise cairo itself
+ * will use the HPS it got at surface creation time, and blit the pixels itself.
+ * It's also a solution, but experience shows that if this happens from a non-PM
+ * thread, then it can screw up PM internals.
+ *
+ * So, best solution is to set the HWND for the surface after the surface
+ * creation, so every blit will be done from application's message processing
+ * loop, which is the safest way to do.
+ *
+ * Since: 1.4
+ **/
+void
+cairo_os2_surface_set_hwnd (cairo_surface_t *surface,
+                            HWND             hwnd_client_window)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return;
+    }
+
+    if (DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT)
+        != NO_ERROR)
+    {
+        /* Could not get mutex! */
+        return;
+    }
+
+    local_os2_surface->hwnd_client_window = hwnd_client_window;
+
+    DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+}
+
+/**
+ * cairo_os2_surface_set_manual_window_refresh:
+ * @surface: the cairo surface to set the refresh mode for
+ * @manual_refresh: the switch for manual surface refresh
+ *
+ * This API can tell Cairo if it should show every change to this surface
+ * immediately in the window or if it should be cached and will only be visible
+ * once the user calls cairo_os2_surface_refresh_window() explicitly. If the
+ * HWND was not set in the cairo surface, then the HPS will be used to blit the
+ * graphics. Otherwise it will invalidate the given window region so the user
+ * will get the WM_PAINT message to redraw that area of the window.
+ *
+ * So, if you're only interested in displaying the final result after several
+ * drawing operations, you might get better performance if you put the surface
+ * into manual refresh mode by passing a true value to this function. Then call
+ * cairo_os2_surface_refresh() whenever desired.
+ *
+ * Since: 1.4
+ **/
+void
+cairo_os2_surface_set_manual_window_refresh (cairo_surface_t *surface,
+                                             cairo_bool_t     manual_refresh)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return;
+    }
+
+    local_os2_surface->blit_as_changes = !manual_refresh;
+}
+
+/**
+ * cairo_os2_surface_get_manual_window_refresh:
+ * @surface: the cairo surface to query the refresh mode from
+ *
+ * This space left intentionally blank.
+ *
+ * Return value: current refresh mode of the surface (true by default)
+ *
+ * Since: 1.4
+ **/
+cairo_bool_t
+cairo_os2_surface_get_manual_window_refresh (cairo_surface_t *surface)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return FALSE;
+    }
+
+    return !(local_os2_surface->blit_as_changes);
+}
+
+/**
+ * cairo_os2_surface_get_hps:
+ * @surface: the cairo surface to be querued
+ * @hps: HPS currently associated with the surface (if any)
+ *
+ * This API retrieves the HPS associated with the surface.
+ *
+ * Return value: %CAIRO_STATUS_SUCCESS if the hps could be retrieved,
+ * %CAIRO_STATUS_SURFACE_TYPE_MISMATCH if the surface is not an OS/2 surface,
+ * %CAIRO_STATUS_NULL_POINTER if the hps argument is null
+ *
+ * Since: 1.10
+ **/
+cairo_status_t
+cairo_os2_surface_get_hps (cairo_surface_t *surface,
+                           HPS             *hps)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
+    }
+    if (!hps)
+    {
+        return _cairo_error (CAIRO_STATUS_NULL_POINTER);
+    }
+    *hps = local_os2_surface->hps_client_window;
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+/**
+ * cairo_os2_surface_set_hps:
+ * @surface: the cairo surface to associate with the HPS
+ * @hps: new HPS to be associated with the surface (the HPS may be null)
+ *
+ * This API replaces the HPS associated with the surface with a new one.
+ * The caller retains ownership of the HPS and must dispose of it after
+ * the surface has been destroyed or it has been replaced by another
+ * call to this function.
+ *
+ * Return value: %CAIRO_STATUS_SUCCESS if the hps could be replaced,
+ * %CAIRO_STATUS_SURFACE_TYPE_MISMATCH if the surface is not an OS/2 surface,
+ *
+ * Since: 1.10
+ **/
+cairo_status_t
+cairo_os2_surface_set_hps (cairo_surface_t *surface,
+                           HPS              hps)
+{
+    cairo_os2_surface_t *local_os2_surface;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
+    }
+    local_os2_surface->hps_client_window = hps;
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static cairo_status_t
+_cairo_os2_surface_mark_dirty_rectangle (void *surface,
+                                         int   x,
+                                         int   y,
+                                         int   width,
+                                         int   height)
+{
+    cairo_os2_surface_t *local_os2_surface;
+    RECTL rclToBlit;
+
+    local_os2_surface = (cairo_os2_surface_t *) surface;
+    if ((!local_os2_surface) ||
+        (local_os2_surface->base.backend != &cairo_os2_surface_backend))
+    {
+        /* Invalid parameter (wrong surface)! */
+        return _cairo_error (CAIRO_STATUS_SURFACE_TYPE_MISMATCH);
+    }
+
+    /* Get mutex, we'll work with the pixel array! */
+    if (DosRequestMutexSem (local_os2_surface->hmtx_use_private_fields, SEM_INDEFINITE_WAIT)
+        != NO_ERROR)
+    {
+        /* Could not get mutex! */
+        return CAIRO_STATUS_NO_MEMORY;
+    }
+
+    /* Check for defaults */
+    if (width < 0)
+        width = local_os2_surface->bitmap_info.cx;
+    if (height < 0)
+        height = local_os2_surface->bitmap_info.cy;
+
+    if (local_os2_surface->hwnd_client_window) {
+        /* We know the HWND, so let's invalidate the window region,
+         * so the application will redraw itself, using the
+         * cairo_os2_surface_refresh_window () API from its own PM thread.
+         * From that function we'll note that it's not a redraw but a
+         * dirty-rectangle deal stuff, so we'll handle the things from
+         * there.
+         *
+         * This is the safe method, which should be preferred every time.
+         */
+        rclToBlit.xLeft = x;
+        rclToBlit.xRight = x + width; /* Noninclusive */
+        rclToBlit.yTop = local_os2_surface->bitmap_info.cy - (y);
+        rclToBlit.yBottom = local_os2_surface->bitmap_info.cy - (y + height); /* Noninclusive */
+
+#if 0
+        if (local_os2_surface->dirty_area_present) {
+            /* Yikes, there is already a dirty area which should be
+             * cleaned up, but we'll overwrite it. Sorry.
+             * TODO: Something clever should be done here.
+             */
+        }
+#endif
+
+        /* Set up dirty area reminder stuff */
+        memcpy (&(local_os2_surface->rcl_dirty_area), &rclToBlit, sizeof (RECTL));
+        local_os2_surface->dirty_area_present = TRUE;
+
+        /* Invalidate window area */
+        WinInvalidateRect (local_os2_surface->hwnd_client_window,
+                           &rclToBlit,
+                           FALSE);
+    } else {
+        /* We don't know the HWND, so try to blit the pixels from here!
+         * Please note that it can be problematic if this is not the PM thread!
+         *
+         * It can cause internal PM stuffs to be scewed up, for some reason.
+         * Please always tell the HWND to the surface using the
+         * cairo_os2_surface_set_hwnd () API, and call cairo_os2_surface_refresh_window ()
+         * from your WM_PAINT, if it's possible!
+         */
+
+        rclToBlit.xLeft = x;
+        rclToBlit.xRight = x + width; /* Noninclusive */
+        rclToBlit.yBottom = y;
+        rclToBlit.yTop = y + height; /* Noninclusive */
+        /* Now get the pixels from the screen! */
+        _cairo_os2_surface_get_pixels_from_screen (local_os2_surface,
+                                                   local_os2_surface->hps_client_window,
+                                                   &rclToBlit);
+    }
+
+    DosReleaseMutexSem (local_os2_surface->hmtx_use_private_fields);
+
+    return CAIRO_STATUS_SUCCESS;
+}
+
+static const cairo_surface_backend_t cairo_os2_surface_backend = {
+    CAIRO_SURFACE_TYPE_OS2,
+    _cairo_os2_surface_finish,
+    _cairo_default_context_create,
+
+    NULL, /* create_similar */
+    NULL, /* create_similar_image */
+    _cairo_os2_surface_map_to_image,
+    _cairo_os2_surface_unmap_image,
+
+    _cairo_surface_default_source,
+    _cairo_os2_surface_acquire_source_image,
+    _cairo_os2_surface_release_source_image,
+    NULL, /* snapshot */
+
+    _cairo_os2_surface_get_extents,
+    NULL, /* get_font_options */
+
+    NULL, /* flush */
+    _cairo_os2_surface_mark_dirty_rectangle,
+
+    _cairo_surface_fallback_paint,
+    _cairo_surface_fallback_mask,
+    _cairo_surface_fallback_fill,
+    _cairo_surface_fallback_stroke,
+    NULL, /* fill/stroke */
+    _cairo_surface_fallback_glyphs,
+};