workbench/libs/cgfx/writergbpixel.c

   1 /*
   2     Copyright © 1995-2017, The AROS Development Team. All rights reserved.
   3     $Id$
   4
   5     Desc:
   6     Lang: english
   7 */
   8
   9 #include <hidd/gfx.h>
  10 #include <aros/debug.h>
  11
  12 #include "cybergraphics_intern.h"
  13
  14 struct render_data
  15 {
  16     HIDDT_Pixel pixel;
  17 };
  18
  19 static LONG PixelHook(struct render_data *data, OOP_Object *bm, OOP_Object *gc,
  20     LONG x, LONG y, struct GfxBase *GfxBase);
  21
  22 /*****************************************************************************
  23
  24     NAME */
  25 #include <proto/cybergraphics.h>
  26
  27         AROS_LH4(LONG, WriteRGBPixel,
  28
  29 /*  SYNOPSIS */
  30         AROS_LHA(struct RastPort *, rp          , A1),
  31         AROS_LHA(UWORD            , x           , D0),
  32         AROS_LHA(UWORD            , y           , D1),
  33         AROS_LHA(ULONG            , pixel       , D2),
  34
  35 /*  LOCATION */
  36         struct Library *, CyberGfxBase, 19, Cybergraphics)
  37
  38 /*  FUNCTION
  39         Writes a new color value to a pixel in a RastPort.
  40
  41     INPUTS
  42         rp - the RastPort to write to.
  43         x, y - the coordinates of the pixel to write.
  44         pixel - the pixel's new color value in 32-bit ARGB format: 1 byte
  45             per component, in the order alpha, red, green, blue.
  46
  47     RESULT
  48         error - 0 if no error occurred, or -1 if (x, y) is outside the
  49             RastPort.
  50
  51     NOTES
  52
  53     EXAMPLE
  54
  55     BUGS
  56
  57     SEE ALSO
  58
  59     INTERNALS
  60
  61 *****************************************************************************/
  62 {
  63     AROS_LIBFUNC_INIT
  64
  65     struct render_data data;
  66     HIDDT_Color col;
  67     LONG retval;
  68
  69     /* This is cybergraphx. We only work wih HIDD bitmaps */
  70     if (!IS_HIDD_BM(rp->BitMap))
  71     {
  72         D(bug("!!!!! Trying to use CGFX call on non-hidd bitmap "
  73             "in WriteRGBPixel() !!!\n"));
  74         return 0;
  75     }
  76
  77     /* HIDDT_ColComp are 16 Bit */
  78
  79     col.alpha = (HIDDT_ColComp)((pixel >> 16) & 0x0000FF00);
  80     col.red = (HIDDT_ColComp)((pixel >> 8) & 0x0000FF00);
  81     col.green = (HIDDT_ColComp)(pixel & 0x0000FF00);
  82     col.blue = (HIDDT_ColComp)((pixel << 8) & 0x0000FF00);
  83
  84     data.pixel = HIDD_BM_MapColor(HIDD_BM_OBJ(rp->BitMap), &col);
  85
  86     retval = DoPixelFunc(rp, x, y, PixelHook, &data, TRUE);
  87
  88     return retval;
  89
  90     AROS_LIBFUNC_EXIT
  91 } /* WriteRGBPixel */
  92
  93 static LONG PixelHook(struct render_data *data, OOP_Object *bm, OOP_Object *gc,
  94     LONG x, LONG y, struct GfxBase *GfxBase)
  95 {
  96     HIDD_BM_PutPixel(bm, x, y, data->pixel);
  97
  98     return 0;
  99 }
 100