/**
* Apply the Scale2x effect on a bitmap.
* The destination bitmap is filled with the scaled version of the source bitmap.
* The source bitmap isn't modified.
* The destination bitmap must be manually allocated before calling the function,
* note that the resulting size is exactly 2x2 times the size of the source bitmap.
* \param void_dst Pointer at the first pixel of the destination bitmap.
* \param dst_slice Size in bytes of a destination bitmap row.
* \param void_src Pointer at the first pixel of the source bitmap.
* \param src_slice Size in bytes of a source bitmap row.
* \param pixel Bytes per pixel of the source and destination bitmap.
* \param width Horizontal size in pixels of the source bitmap.
* \param height Vertical size in pixels of the source bitmap.
*/
static void scale2x(void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
{
unsigned char* dst = (unsigned char*)void_dst;
const unsigned char* src = (const unsigned char*)void_src;
unsigned count;
assert(height >= 2);
count = height;
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
dst = SCDST(2);
count -= 2;
while (count) {
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
dst = SCDST(2);
src = SCSRC(1);
--count;
}
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(1), SCSRC(1), pixel, width);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
scale2x_mmx_emms();
#endif
}
/**
* Apply the Scale2x effect on a bitmap.
* The destination bitmap is filled with the scaled version of the source bitmap.
* The source bitmap isn't modified.
* The destination bitmap must be manually allocated before calling the function,
* note that the resulting size is exactly 2x2 times the size of the source bitmap.
* \param void_dst Pointer at the first pixel of the destination bitmap.
* \param dst_slice Size in bytes of a destination bitmap row.
* \param void_src Pointer at the first pixel of the source bitmap.
* \param src_slice Size in bytes of a source bitmap row.
* \param pixel Bytes per pixel of the source and destination bitmap.
* \param width Horizontal size in pixels of the source bitmap.
* \param height Vertical size in pixels of the source bitmap.
*/
void MDP_FNCALL scale2x(void* void_dst, unsigned int dst_slice,
const void* void_src, unsigned int src_slice,
unsigned int pixel, unsigned int width, unsigned int height)
{
unsigned char* dst = (unsigned char*)void_dst;
const unsigned char* src = (const unsigned char*)void_src;
unsigned int count;
assert(height >= 2);
count = height;
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
dst = SCDST(2);
count -= 2;
while (count)
{
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
dst = SCDST(2);
src = SCSRC(1);
--count;
}
stage_scale2x(SCDST(0), SCDST(1), SCSRC(0), SCSRC(1), SCSRC(1), pixel, width);
}
/**
* Apply the Scale4x effect on a bitmap.
* The destination bitmap is filled with the scaled version of the source bitmap.
* The source bitmap isn't modified.
* The destination bitmap must be manually allocated before calling the function,
* note that the resulting size is exactly 4x4 times the size of the source bitmap.
* \note This function requires also a small buffer bitmap used internally to store
* intermediate results. This bitmap must have at least an horizontal size in bytes of 2*width*pixel,
* and a vertical size of 6 rows. The memory of this buffer must not be allocated
* in video memory because it's also read and not only written. Generally
* a heap (malloc) or a stack (alloca) buffer is the best choices.
* \param void_dst Pointer at the first pixel of the destination bitmap.
* \param dst_slice Size in bytes of a destination bitmap row.
* \param void_mid Pointer at the first pixel of the buffer bitmap.
* \param mid_slice Size in bytes of a buffer bitmap row.
* \param void_src Pointer at the first pixel of the source bitmap.
* \param src_slice Size in bytes of a source bitmap row.
* \param pixel Bytes per pixel of the source and destination bitmap.
* \param width Horizontal size in pixels of the source bitmap.
* \param height Vertical size in pixels of the source bitmap.
*/
static void scale4x_buf(void* void_dst, unsigned dst_slice, void* void_mid, unsigned mid_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
{
unsigned char* dst = (unsigned char*)void_dst;
const unsigned char* src = (const unsigned char*)void_src;
unsigned count;
unsigned char* mid[6];
assert(height >= 4);
count = height;
/* set the 6 buffer pointers */
mid[0] = (unsigned char*)void_mid;
mid[1] = mid[0] + mid_slice;
mid[2] = mid[1] + mid_slice;
mid[3] = mid[2] + mid_slice;
mid[4] = mid[3] + mid_slice;
mid[5] = mid[4] + mid_slice;
while (count) {
unsigned char* tmp;
stage_scale2x(SCMID(4), SCMID(5), SCSRC(2), SCSRC(3), SCSRC(4), pixel, width);
stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(1), SCMID(2), SCMID(3), SCMID(4), pixel, width);
dst = SCDST(4);
src = SCSRC(1);
tmp = SCMID(0); /* shift by 2 position */
SCMID(0) = SCMID(2);
SCMID(2) = SCMID(4);
SCMID(4) = tmp;
tmp = SCMID(1);
SCMID(1) = SCMID(3);
SCMID(3) = SCMID(5);
SCMID(5) = tmp;
--count;
}
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
scale2x_mmx_emms();
#endif
}
/**
* Apply the Scale4x effect on a group of rows. Used internally.
*/
static inline void stage_scale4x(void* dst0, void* dst1, void* dst2, void* dst3, const void* src0, const void* src1, const void* src2, const void* src3, unsigned pixel, unsigned pixel_per_row)
{
stage_scale2x(dst0, dst1, src0, src1, src2, pixel, 2 * pixel_per_row);
stage_scale2x(dst2, dst3, src1, src2, src3, pixel, 2 * pixel_per_row);
}
