src/servers/app/drawing/MallocBuffer.cpp

   1 // MallocBuffer.h
   2
   3 #include <malloc.h>
   4
   5 #include "MallocBuffer.h"
   6
   7 // TODO: maybe this class could be more flexible by taking
   8 // a color_space argument in the constructor
   9 // the hardcoded width * 4 (because that's how it's used now anyways)
  10 // could be avoided, but I'm in a hurry... :-)
  11
  12 // constructor
  13 MallocBuffer::MallocBuffer(uint32 width,
  14                                                    uint32 height)
  15         : fBuffer(NULL),
  16           fWidth(width),
  17           fHeight(height)
  18 {
  19         if (fWidth > 0 && fHeight > 0) {
  20                 fBuffer = malloc((fWidth * 4) * fHeight);
  21         }
  22 }
  23
  24 // destructor
  25 MallocBuffer::~MallocBuffer()
  26 {
  27         if (fBuffer)
  28                 free(fBuffer);
  29 }
  30
  31 // InitCheck
  32 status_t
  33 MallocBuffer::InitCheck() const
  34 {
  35         return fBuffer ? B_OK : B_NO_MEMORY;
  36 }
  37
  38 // ColorSpace
  39 color_space
  40 MallocBuffer::ColorSpace() const
  41 {
  42         return B_RGBA32;
  43 }
  44
  45 // Bits
  46 void*
  47 MallocBuffer::Bits() const
  48 {
  49         if (InitCheck() >= B_OK)
  50                 return fBuffer;
  51         return NULL;
  52 }
  53
  54 // BytesPerRow
  55 uint32
  56 MallocBuffer::BytesPerRow() const
  57 {
  58         if (InitCheck() >= B_OK)
  59                 return fWidth * 4;
  60         return 0;
  61 }
  62
  63 // Width
  64 uint32
  65 MallocBuffer::Width() const
  66 {
  67         if (InitCheck() >= B_OK)
  68                 return fWidth;
  69         return 0;
  70 }
  71
  72 // Height
  73 uint32
  74 MallocBuffer::Height() const
  75 {
  76         if (InitCheck() >= B_OK)
  77                 return fHeight;
  78         return 0;
  79 }
  80