static void
Init(void *obj)
{
AG_Driver *drv = obj;
drv->id = 0;
drv->flags = 0;
drv->sRef = AG_SurfaceRGBA(1,1, 32, 0,
#if AG_BYTEORDER == AG_BIG_ENDIAN
0xff000000, 0x00ff0000, 0x0000ff00, 0x000000ff
#else
0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000
#endif
);
if (drv->sRef == NULL) {
AG_FatalError(NULL);
}
drv->videoFmt = NULL;
drv->kbd = NULL;
drv->mouse = NULL;
drv->cursors = NULL;
drv->nCursors = 0;
drv->activeCursor = NULL;
drv->gl = NULL;
AG_TextInitGlyphCache(drv);
}
/* Compile surfaces/textures for the given static icon. */
void
AG_InitStaticIcon(AG_StaticIcon *icon)
{
const Uint32 *src;
Uint8 *dst;
int x, y;
if (!agGUI)
return;
icon->s = AG_SurfaceRGBA(icon->w, icon->h, agSurfaceFmt->BitsPerPixel,
0, icon->Rmask, icon->Gmask, icon->Bmask, icon->Amask);
src = &icon->data[0];
dst = icon->s->pixels;
for (y = 0; y < icon->h; y++) {
for (x = 0; x < icon->w; x++) {
AG_SurfacePutPixel(icon->s, dst, *src);
dst += icon->s->format->BytesPerPixel;
src++;
}
}
}
/*
* Load surface contents from a Windows BMP file.
*
* Code for expanding 1bpp and 4bpp to 8bpp depth was shamefully
* stolen from SDL.
*/
AG_Surface *
AG_ReadSurfaceFromBMP(AG_DataSource *ds)
{
struct ag_bmp_header bh;
struct ag_bmp_info_header bi;
Uint32 Rmask = 0, Gmask = 0, Bmask = 0, Amask = 0;
AG_Surface *s;
off_t offs;
Uint8 *pStart, *pEnd, *pDst;
int i, bmpPitch, expandBpp, bmpPad, topDown;
offs = AG_Tell(ds);
bh.magic[0] = '?';
bh.magic[1] = '?';
if (AG_Read(ds, bh.magic, 2) != 0 ||
bh.magic[0] != 'B' || bh.magic[1] != 'M') {
AG_SetError("Not a Windows BMP file (`%c%c')",
bh.magic[0], bh.magic[1]);
return (NULL);
}
/* Uses little-endian byte order */
AG_SetByteOrder(ds, AG_BYTEORDER_LE);
bh.size = AG_ReadUint32(ds);
bh.resv[0] = AG_ReadUint16(ds);
bh.resv[1] = AG_ReadUint16(ds);
bh.offBits = AG_ReadUint32(ds);
bi.size = AG_ReadUint32(ds);
if (bi.size == 12) {
bi.w = (Uint32)AG_ReadUint16(ds);
bi.h = (Uint32)AG_ReadUint16(ds);
bi.planes = AG_ReadUint16(ds);
bi.bitCount = AG_ReadUint16(ds);
bi.encoding = AG_BMP_RGB;
bi.sizeImage = 0;
bi.XPelsPerMeter = 0;
bi.YPelsPerMeter = 0;
bi.clrUsed = 0;
bi.clrImportant = 0;
} else {
bi.w = AG_ReadSint32(ds);
bi.h = AG_ReadSint32(ds);
bi.planes = AG_ReadUint16(ds);
bi.bitCount = AG_ReadUint16(ds);
bi.encoding = AG_ReadUint32(ds);
bi.sizeImage = AG_ReadUint32(ds);
bi.XPelsPerMeter = AG_ReadUint32(ds);
bi.YPelsPerMeter = AG_ReadUint32(ds);
bi.clrUsed = AG_ReadUint32(ds);
bi.clrImportant = AG_ReadUint32(ds);
}
if (bi.h < 0) {
topDown = 1;
bi.h = -bi.h;
} else {
topDown = 0;
}
/* Will convert 1bpp/4bpp to 8bpp */
if (bi.bitCount == 1 || bi.bitCount == 4) {
expandBpp = bi.bitCount;
bi.bitCount = 8;
} else {
expandBpp = 0;
}
switch (bi.encoding) {
case AG_BMP_RGB:
if (bh.offBits == (14 + bi.size)) {
switch (bi.bitCount) {
case 15:
case 16:
Rmask = 0x7C00;
Gmask = 0x03E0;
Bmask = 0x001F;
break;
case 24:
#if AG_BYTEORDER == AG_BIG_ENDIAN
Rmask = 0x000000FF;
Gmask = 0x0000FF00;
Bmask = 0x00FF0000;
break;
#endif
case 32:
Rmask = 0x00FF0000;
Gmask = 0x0000FF00;
Bmask = 0x000000FF;
break;
}
break;
}
/* FALLTHROUGH */
case AG_BMP_BITFIELDS:
switch (bi.bitCount) {
case 15:
case 16:
Rmask = AG_ReadUint32(ds);
Gmask = AG_ReadUint32(ds);
Bmask = AG_ReadUint32(ds);
break;
case 32:
Rmask = AG_ReadUint32(ds);
Gmask = AG_ReadUint32(ds);
Bmask = AG_ReadUint32(ds);
Amask = AG_ReadUint32(ds);
break;
}
break;
default:
AG_SetError("BMP compression unimplemented");
return (NULL);
}
if ((s = AG_SurfaceRGBA(bi.w, bi.h, bi.bitCount,
(Amask != 0) ? AG_SRCALPHA : 0,
Rmask, Gmask, Bmask, Amask)) == NULL) {
return (NULL);
}
if (s->format->palette != NULL) {
if (bi.clrUsed == 0) {
bi.clrUsed = (1 << bi.bitCount);
}
if (bi.size == 12) {
for (i = 0; i < bi.clrUsed; i++) {
s->format->palette->colors[i].b = AG_ReadUint8(ds);
s->format->palette->colors[i].g = AG_ReadUint8(ds);
s->format->palette->colors[i].r = AG_ReadUint8(ds);
}
} else {
for (i = 0; i < bi.clrUsed; i++) {
s->format->palette->colors[i].b = AG_ReadUint8(ds);
s->format->palette->colors[i].g = AG_ReadUint8(ds);
s->format->palette->colors[i].r = AG_ReadUint8(ds);
(void)AG_ReadUint8(ds); /* unused */
}
}
s->format->palette->nColors = bi.clrUsed;
}
if (AG_Seek(ds, offs+bh.offBits, AG_SEEK_SET) == -1)
goto fail;
pStart = (Uint8 *)s->pixels;
pEnd = (Uint8 *)s->pixels + (s->h*s->pitch);
switch (expandBpp) {
case 1:
bmpPitch = (bi.w + 7) >> 3;
bmpPad = ((bmpPitch % 4) ? (4 - (bmpPitch % 4)) : 0);
break;
case 4:
bmpPitch = (bi.w + 1) >> 1;
bmpPad = ((bmpPitch % 4) ? (4 - (bmpPitch % 4)) : 0);
break;
default:
bmpPad = ((s->pitch % 4) ? (4 - (s->pitch % 4)) : 0);
break;
}
pDst = topDown ? pStart : (pEnd - s->pitch);
while (pDst >= pStart && pDst < pEnd) {
switch (expandBpp) {
case 1:
case 4:
{
Uint8 px = 0;
int shift = (8 - expandBpp);
for (i = 0; i < s->w; i++) {
if (i % (8/expandBpp) == 0) {
px = AG_ReadUint8(ds);
}
*(pDst + i) = (px >> shift);
px <<= expandBpp;
}
}
break;
default:
if (AG_Read(ds, pDst, s->pitch) != 0) {
goto fail;
}
#if AG_BYTEORDER == AG_BIG_ENDIAN
switch (bi.bitCount) {
case 15:
case 16:
{
Uint16 *px = (Uint16 *)pDst;
for (i = 0; i < s->w; i++) {
px[i] = AG_Swap16(px[i]);
}
break;
}
case 32:
{
Uint32 *px = (Uint32 *)pDst;
for (i = 0; i < s->w; i++) {
px[i] = AG_Swap32(px[i]);
}
break;
}
}
#endif /* AG_BYTEORDER == AG_BIG_ENDIAN */
break;
}
if (bmpPad != 0) {
if (AG_Seek(ds, bmpPad, AG_SEEK_CUR) == -1)
goto fail;
}
if (topDown) {
pDst += s->pitch;
} else {
pDst -= s->pitch;
}
}
return (s);
fail:
AG_SurfaceFree(s);
return (NULL);
}
