src/gallium/winsys/gdi/gdi_sw_winsys.c

   1 /**************************************************************************
   2  *
   3  * Copyright 2009 VMware, Inc.
   4  * All Rights Reserved.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the
   8  * "Software"), to deal in the Software without restriction, including
   9  * without limitation the rights to use, copy, modify, merge, publish,
  10  * distribute, sub license, and/or sell copies of the Software, and to
  11  * permit persons to whom the Software is furnished to do so, subject to
  12  * the following conditions:
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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  19  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  20  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  * The above copyright notice and this permission notice (including the
  23  * next paragraph) shall be included in all copies or substantial portions
  24  * of the Software.
  25  *
  26  *
  27  **************************************************************************/
  28
  29 /**
  30  * @file
  31  * GDI software rasterizer support.
  32  *
  33  * @author Jose Fonseca <jfonseca@vmware.com>
  34  */
  35
  36
  37 #include <windows.h>
  38
  39 #include "pipe/p_format.h"
  40 #include "pipe/p_context.h"
  41 #include "util/u_inlines.h"
  42 #include "util/u_format.h"
  43 #include "util/u_math.h"
  44 #include "util/u_memory.h"
  45 #include "state_tracker/sw_winsys.h"
  46 #include "gdi_sw_winsys.h"
  47
  48
  49 struct gdi_sw_displaytarget
  50 {
  51    enum pipe_format format;
  52    unsigned width;
  53    unsigned height;
  54    unsigned stride;
  55
  56    unsigned size;
  57
  58    void *data;
  59
  60    BITMAPINFO bmi;
  61 };
  62
  63
  64 /** Cast wrapper */
  65 static INLINE struct gdi_sw_displaytarget *
  66 gdi_sw_displaytarget( struct sw_displaytarget *buf )
  67 {
  68    return (struct gdi_sw_displaytarget *)buf;
  69 }
  70
  71
  72 static boolean
  73 gdi_sw_is_displaytarget_format_supported( struct sw_winsys *ws,
  74                                                 enum pipe_format format )
  75 {
  76    switch(format) {
  77    case PIPE_FORMAT_B8G8R8X8_UNORM:
  78    case PIPE_FORMAT_B8G8R8A8_UNORM:
  79       return TRUE;
  80
  81    /* TODO: Support other formats possible with BMPs, as described in
  82     * http://msdn.microsoft.com/en-us/library/dd183376(VS.85).aspx */
  83
  84    default:
  85       return FALSE;
  86    }
  87 }
  88
  89
  90 static void *
  91 gdi_sw_displaytarget_map(struct sw_winsys *ws,
  92                                struct sw_displaytarget *dt,
  93                                unsigned flags )
  94 {
  95    struct gdi_sw_displaytarget *gdt = gdi_sw_displaytarget(dt);
  96
  97    return gdt->data;
  98 }
  99
 100
 101 static void
 102 gdi_sw_displaytarget_unmap(struct sw_winsys *ws,
 103                                  struct sw_displaytarget *dt )
 104 {
 105
 106 }
 107
 108
 109 static void
 110 gdi_sw_displaytarget_destroy(struct sw_winsys *winsys,
 111                                    struct sw_displaytarget *dt)
 112 {
 113    struct gdi_sw_displaytarget *gdt = gdi_sw_displaytarget(dt);
 114
 115    align_free(gdt->data);
 116    FREE(gdt);
 117 }
 118
 119
 120 static struct sw_displaytarget *
 121 gdi_sw_displaytarget_create(struct sw_winsys *winsys,
 122                                   enum pipe_format format,
 123                                   unsigned width, unsigned height,
 124                                   unsigned alignment,
 125                                   unsigned *stride)
 126 {
 127    struct gdi_sw_displaytarget *gdt;
 128    unsigned cpp;
 129    unsigned bpp;
 130
 131    gdt = CALLOC_STRUCT(gdi_sw_displaytarget);
 132    if(!gdt)
 133       goto no_gdt;
 134
 135    gdt->format = format;
 136    gdt->width = width;
 137    gdt->height = height;
 138
 139    bpp = util_format_get_blocksizebits(format);
 140    cpp = util_format_get_blocksize(format);
 141
 142    gdt->stride = align(width * cpp, alignment);
 143    gdt->size = gdt->stride * height;
 144
 145    gdt->data = align_malloc(gdt->size, alignment);
 146    if(!gdt->data)
 147       goto no_data;
 148
 149    gdt->bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
 150    gdt->bmi.bmiHeader.biWidth = gdt->stride / cpp;
 151    gdt->bmi.bmiHeader.biHeight= -(long)height;
 152    gdt->bmi.bmiHeader.biPlanes = 1;
 153    gdt->bmi.bmiHeader.biBitCount = bpp;
 154    gdt->bmi.bmiHeader.biCompression = BI_RGB;
 155    gdt->bmi.bmiHeader.biSizeImage = 0;
 156    gdt->bmi.bmiHeader.biXPelsPerMeter = 0;
 157    gdt->bmi.bmiHeader.biYPelsPerMeter = 0;
 158    gdt->bmi.bmiHeader.biClrUsed = 0;
 159    gdt->bmi.bmiHeader.biClrImportant = 0;
 160
 161    *stride = gdt->stride;
 162    return (struct sw_displaytarget *)gdt;
 163
 164 no_data:
 165    FREE(gdt);
 166 no_gdt:
 167    return NULL;
 168 }
 169
 170
 171 void
 172 gdi_sw_display( struct sw_winsys *winsys,
 173                 struct sw_displaytarget *dt,
 174                 HDC hDC )
 175 {
 176     struct gdi_sw_displaytarget *gdt = gdi_sw_displaytarget(dt);
 177
 178     StretchDIBits(hDC,
 179                   0, 0, gdt->width, gdt->height,
 180                   0, 0, gdt->width, gdt->height,
 181                   gdt->data, &gdt->bmi, 0, SRCCOPY);
 182 }
 183
 184 static void
 185 gdi_sw_displaytarget_display(struct sw_winsys *winsys,
 186                              struct sw_displaytarget *dt,
 187                              void *context_private)
 188 {
 189     /* nasty:
 190      */
 191     HDC hDC = (HDC)context_private;
 192
 193     gdi_sw_display(winsys, dt, hDC);
 194 }
 195
 196
 197 static void
 198 gdi_sw_destroy(struct sw_winsys *winsys)
 199 {
 200    FREE(winsys);
 201 }
 202
 203 struct sw_winsys *
 204 gdi_create_sw_winsys(void)
 205 {
 206    static struct sw_winsys *winsys;
 207
 208    winsys = CALLOC_STRUCT(sw_winsys);
 209    if(!winsys)
 210       return NULL;
 211
 212    winsys->destroy = gdi_sw_destroy;
 213    winsys->is_displaytarget_format_supported = gdi_sw_is_displaytarget_format_supported;
 214    winsys->displaytarget_create = gdi_sw_displaytarget_create;
 215    winsys->displaytarget_map = gdi_sw_displaytarget_map;
 216    winsys->displaytarget_unmap = gdi_sw_displaytarget_unmap;
 217    winsys->displaytarget_display = gdi_sw_displaytarget_display;
 218    winsys->displaytarget_destroy = gdi_sw_displaytarget_destroy;
 219
 220    return winsys;
 221 }
 222