static off_t PixelIndex(FloatPixMapRef pm, FPMPoint pt)
{
FPM_INTERNAL_ASSERT(pm != NULL);
FPM_INTERNAL_ASSERT(PointInRange(pm, pt));
return pm->width * pt.y + pt.x;
}
static bool PointInRange(FloatPixMapRef pm, FPMPoint pt)
{
FPM_INTERNAL_ASSERT(pm != NULL);
return 0 <= pt.x && pt.x < pm->width &&
0 <= pt.y && pt.y < pm->height;
}
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;
}
static void Destroy(FloatPixMapRef pm)
{
FPM_INTERNAL_ASSERT(pm != NULL);
// Only "masterless" FPMs own their pixels.
if (pm->master == NULL)
{
free(pm->pixels);
}
else
{
FPMRelease(&pm->master);
}
free(pm);
}
static FloatPixMapRef ConvertPNGDataRGB16(FloatPixMapRef pm, uint8_t *data, size_t width, size_t height, size_t rowBytes)
{
uint16_t *src = NULL;
float *dst = NULL;
size_t x, y;
for (y = 0; y < height; y++)
{
src = (uint16_t *)(data + rowBytes * y);
dst = (float *)FPMGetPixelPointerC(pm, 0, y);
FPM_INTERNAL_ASSERT(src != NULL && dst != NULL);
for (x = 0; x < width * 3; x++)
{
*dst++ = (float)*src++ * 1.0f/65535.0f;
}
}
return pm;
}
static size_t GetPixelCount(FloatPixMapRef pm)
{
FPM_INTERNAL_ASSERT(pm != NULL);
return pm->width * pm->height;
}
