bool ReadCubeCrossConstructor(FloatPixMapRef sourceImage, RenderFlags flags, SphericalPixelSourceFunction *source, void **context)
{
if (sourceImage == NULL || context == NULL) return false;
ReadCubeContext *cx = malloc(sizeof (ReadCubeContext));
if (cx == NULL) return false;
cx->pm = FPMRetain(sourceImage);
FPMSize totalSize = FPMGetSize(sourceImage);
if (totalSize.width % 4 != 0 || totalSize.height % 3 != 0)
{
fprintf(stderr, "Cross cube map width must be a multiple of four pixels and height must be a multiple of three pixels.\n");
return false;
}
cx->faceSize.width = totalSize.width / 4;
cx->faceSize.height = totalSize.height / 3;
cx->halfWidth = (float)cx->faceSize.width / 2.0;
cx->halfHeight = (float)cx->faceSize.height / 2.0;
cx->maxX = (float)cx->faceSize.width - 1.0f;
cx->maxY = (float)cx->faceSize.height - 1.0f;
cx->pxPos = (FPMPoint){ 2 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->nxPos = (FPMPoint){ 0 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->pyPos = (FPMPoint){ 1 * cx->faceSize.width, 0 * cx->faceSize.height };
cx->nyPos = (FPMPoint){ 1 * cx->faceSize.width, 2 * cx->faceSize.height };
cx->pzPos = (FPMPoint){ 1 * cx->faceSize.width, 1 * cx->faceSize.height };
cx->nzPos = (FPMPoint){ 3 * cx->faceSize.width, 1 * cx->faceSize.height };
*context = cx;
*source = ReadCube;
return true;
}
bool ReadCubeConstructor(FloatPixMapRef sourceImage, RenderFlags flags, void **context)
{
if (sourceImage == NULL || context == NULL) return false;
ReadCubeContext *cx = malloc(sizeof (ReadCubeContext));
if (cx == NULL) return false;
cx->pm = FPMRetain(sourceImage);
FPMSize totalSize = FPMGetSize(sourceImage);
if (totalSize.height % 6 != 0)
{
fprintf(stderr, "Cube map height must be a multiple of six pixels.\n");
return false;
}
cx->faceSize.width = totalSize.width;
cx->faceSize.height = totalSize.height / 6;
cx->halfWidth = (float)cx->faceSize.width / 2.0f;
cx->halfHeight = (float)cx->faceSize.height / 2.0f;
cx->maxX = (float)cx->faceSize.width - 1.0f;
cx->maxY = (float)cx->faceSize.height - 1.0f;
cx->pxPos = (FPMPoint) {
0, 0 * cx->faceSize.height
};
cx->nxPos = (FPMPoint) {
0, 1 * cx->faceSize.height
};
cx->pyPos = (FPMPoint) {
0, 2 * cx->faceSize.height
};
cx->nyPos = (FPMPoint) {
0, 3 * cx->faceSize.height
};
cx->pzPos = (FPMPoint) {
0, 4 * cx->faceSize.height
};
cx->nzPos = (FPMPoint) {
0, 5 * cx->faceSize.height
};
*context = cx;
return true;
}
static FloatPixMapRef MakeFPM(FPMSize size, FPMDimension rowCount, FPMColor *pixels, FloatPixMapRef master)
{
FloatPixMapRef result = malloc(sizeof (FloatPixMap));
if (result != NULL)
{
FPM_INTERNAL_ASSERT(FPMSizeArea(size) == 0 || pixels != NULL);
FPM_INTERNAL_ASSERT(size.width <= rowCount);
result->retainCount = 1;
result->width = size.width;
result->height = size.height;
result->rowCount = rowCount;
result->pixels = pixels;
result->master = FPMRetain(master);
}
return result;
}
bool ReadLatLongConstructor(FloatPixMapRef sourceImage, RenderFlags flags, SphericalPixelSourceFunction *source, void **context)
{
if (sourceImage == NULL || context == NULL) return false;
ReadLatLongContext *cx = malloc(sizeof (ReadLatLongContext));
if (cx == NULL) return false;
cx->pm = FPMRetain(sourceImage);
cx->pwidth = FPMGetWidth(sourceImage);
cx->width = (float)cx->pwidth / (2.0f * kPiF);
cx->height = (float)FPMGetHeight(sourceImage) / kPiF;
if (flags & kRenderFast) *source = ReadLatLongFast;
else *source = ReadLatLong;
*context = cx;
return true;
}
FloatPixMapRef FPMCopy(FloatPixMapRef pm)
{
if (pm != NULL)
{
size_t byteCount = GetPixelCount(pm) * sizeof (FPMColor);
if (byteCount == 0)
{
// One empty pixmap of a given size is the same as another, so we'll stick with the one instead of making another.
assert(pm->pixels == NULL);
return FPMRetain(pm);
}
assert(pm->pixels != NULL);
void *pixels = malloc(byteCount);
if (pixels == NULL) return NULL;
if (pm->rowCount == pm->width)
{
// No padding to skip.
memcpy(pixels, pm->pixels, byteCount);
}
else
{
// Original is padded, copy row by row.
FPMColor *srcPx = pm->pixels;
FPMColor *dstPx = pixels;
size_t count = pm->height;
do
{
memcpy(dstPx, srcPx, sizeof (FPMColor) * pm->width);
srcPx += pm->rowCount;
dstPx += pm->width;
} while (--count);
}
return MakeFPM(FPMMakeSize(pm->width, pm->height), pm->width, pixels, NULL);
}
else
{
return NULL;
}
}
