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503 lines (423 loc) · 18.9 KB
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/*
* This file is part of the Scale2x project.
*
* Copyright (C) 2003, 2004 Andrea Mazzoleni
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* This file contains an example implementation of the Scale effect
* applyed to a generic bitmap.
*
* You can find an high level description of the effect at :
*
* http://scale2x.sourceforge.net/
*
* Alternatively at the previous license terms, you are allowed to use this
* code in your program with these conditions:
* - the program is not used in commercial activities.
* - the whole source code of the program is released with the binary.
* - derivative works of the program are allowed.
*/
#include "scale2x.h"
#include "scale3x.h"
#include <assert.h>
#include <stdlib.h>
#define SSDST(bits, num) (scale2x_uint##bits *)dst##num
#define SSSRC(bits, num) (const scale2x_uint##bits *)src##num
/**
* Apply the Scale2x effect on a group of rows. Used internally.
*/
static inline void stage_scale2x(void* dst0, void* dst1, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
{
switch (pixel) {
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
case 1 : scale2x_8_mmx(SSDST(8,0), SSDST(8,1), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x_16_mmx(SSDST(16,0), SSDST(16,1), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x_32_mmx(SSDST(32,0), SSDST(32,1), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#else
case 1 : scale2x_8_def(SSDST(8,0), SSDST(8,1), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x_16_def(SSDST(16,0), SSDST(16,1), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x_32_def(SSDST(32,0), SSDST(32,1), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#endif
}
}
/**
* Apply the Scale2x3 effect on a group of rows. Used internally.
*/
static inline void stage_scale2x3(void* dst0, void* dst1, void* dst2, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
{
switch (pixel) {
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
case 1 : scale2x3_8_mmx(SSDST(8,0), SSDST(8,1), SSDST(8,2), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x3_16_mmx(SSDST(16,0), SSDST(16,1), SSDST(16,2), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x3_32_mmx(SSDST(32,0), SSDST(32,1), SSDST(32,2), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#else
case 1 : scale2x3_8_def(SSDST(8,0), SSDST(8,1), SSDST(8,2), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x3_16_def(SSDST(16,0), SSDST(16,1), SSDST(16,2), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x3_32_def(SSDST(32,0), SSDST(32,1), SSDST(32,2), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#endif
}
}
/**
* Apply the Scale2x4 effect on a group of rows. Used internally.
*/
static inline void stage_scale2x4(void* dst0, void* dst1, void* dst2, void* dst3, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
{
switch (pixel) {
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
case 1 : scale2x4_8_mmx(SSDST(8,0), SSDST(8,1), SSDST(8,2), SSDST(8,3), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x4_16_mmx(SSDST(16,0), SSDST(16,1), SSDST(16,2), SSDST(16,3), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x4_32_mmx(SSDST(32,0), SSDST(32,1), SSDST(32,2), SSDST(32,3), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#else
case 1 : scale2x4_8_def(SSDST(8,0), SSDST(8,1), SSDST(8,2), SSDST(8,3), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale2x4_16_def(SSDST(16,0), SSDST(16,1), SSDST(16,2), SSDST(16,3), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale2x4_32_def(SSDST(32,0), SSDST(32,1), SSDST(32,2), SSDST(32,3), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
#endif
}
}
/**
* Apply the Scale3x effect on a group of rows. Used internally.
*/
static inline void stage_scale3x(void* dst0, void* dst1, void* dst2, const void* src0, const void* src1, const void* src2, unsigned pixel, unsigned pixel_per_row)
{
switch (pixel) {
case 1 : scale3x_8_def(SSDST(8,0), SSDST(8,1), SSDST(8,2), SSSRC(8,0), SSSRC(8,1), SSSRC(8,2), pixel_per_row); break;
case 2 : scale3x_16_def(SSDST(16,0), SSDST(16,1), SSDST(16,2), SSSRC(16,0), SSSRC(16,1), SSSRC(16,2), pixel_per_row); break;
case 4 : scale3x_32_def(SSDST(32,0), SSDST(32,1), SSDST(32,2), SSSRC(32,0), SSSRC(32,1), SSSRC(32,2), pixel_per_row); break;
}
}
/**
* 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);
}
#define SCDST(i) (dst+(i)*dst_slice)
#define SCSRC(i) (src+(i)*src_slice)
#define SCMID(i) (mid[(i)])
/**
* 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 Scale2x3 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 2x3 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 scale2x3(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_scale2x3(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
dst = SCDST(3);
count -= 2;
while (count) {
stage_scale2x3(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
dst = SCDST(3);
src = SCSRC(1);
--count;
}
stage_scale2x3(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(1), SCSRC(1), pixel, width);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
scale2x_mmx_emms();
#endif
}
/**
* Apply the Scale2x4 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 2x4 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 scale2x4(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_scale2x4(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
dst = SCDST(4);
count -= 2;
while (count) {
stage_scale2x4(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
dst = SCDST(4);
src = SCSRC(1);
--count;
}
stage_scale2x4(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCSRC(0), SCSRC(1), SCSRC(1), pixel, width);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
scale2x_mmx_emms();
#endif
}
/**
* Apply the Scale3x 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 3x3 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 scale3x(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_scale3x(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
dst = SCDST(3);
count -= 2;
while (count) {
stage_scale3x(SCDST(0), SCDST(1), SCDST(2), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
dst = SCDST(3);
src = SCSRC(1);
--count;
}
stage_scale3x(SCDST(0), SCDST(1), SCDST(2), 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 choice.
* \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;
stage_scale2x(SCMID(-2+6), SCMID(-1+6), SCSRC(0), SCSRC(0), SCSRC(1), pixel, width);
stage_scale2x(SCMID(0), SCMID(1), SCSRC(0), SCSRC(1), SCSRC(2), pixel, width);
stage_scale2x(SCMID(2), SCMID(3), SCSRC(1), SCSRC(2), SCSRC(3), pixel, width);
stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(-2+6), SCMID(-2+6), SCMID(-1+6), SCMID(0), pixel, width);
dst = SCDST(4);
stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(-1+6), SCMID(0), SCMID(1), SCMID(2), pixel, width);
dst = SCDST(4);
count -= 4;
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;
}
stage_scale2x(SCMID(4), SCMID(5), SCSRC(2), SCSRC(3), SCSRC(3), 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);
stage_scale4x(SCDST(0), SCDST(1), SCDST(2), SCDST(3), SCMID(3), SCMID(4), SCMID(5), SCMID(5), pixel, width);
#if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
scale2x_mmx_emms();
#endif
}
/**
* 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 operates like ::scale4x_buf() but the intermediate buffer is
* automatically allocated in the stack.
* \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 scale4x(void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
{
unsigned mid_slice;
void* mid;
mid_slice = 2 * pixel * width; /* required space for 1 row buffer */
mid_slice = (mid_slice + 0x7) & ~0x7; /* align to 8 bytes */
#if HAVE_ALLOCA
mid = alloca(6 * mid_slice); /* allocate space for 6 row buffers */
assert(mid != 0); /* alloca should never fails */
#else
mid = malloc(6 * mid_slice); /* allocate space for 6 row buffers */
if (!mid)
return;
#endif
scale4x_buf(void_dst, dst_slice, mid, mid_slice, void_src, src_slice, pixel, width, height);
#if !HAVE_ALLOCA
free(mid);
#endif
}
/**
* Check if the scale implementation is applicable at the given arguments.
* \param scale Scale factor. 2, 203 (fox 2x3), 204 (for 2x4), 3 or 4.
* \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.
* \return
* - -1 on precondition violated.
* - 0 on success.
*/
int scale_precondition(unsigned scale, unsigned pixel, unsigned width, unsigned height)
{
if (pixel != 1 && pixel != 2 && pixel != 4)
return -1;
switch (scale) {
case 202 :
case 203 :
case 204 :
case 2 :
case 303 :
case 3 :
if (height < 2)
return -1;
break;
case 404 :
case 4 :
if (height < 4)
return -1;
break;
default:
return -1;
}
if (width < 2)
return -1;
return 0;
}
/**
* Apply the Scale effect on a bitmap.
* This function is simply a common interface for ::scale2x(), ::scale3x() and ::scale4x().
* \param scale Scale factor. 2, 203 (fox 2x3), 204 (for 2x4), 3 or 4.
* \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 scale(unsigned scale, void* void_dst, unsigned dst_slice, const void* void_src, unsigned src_slice, unsigned pixel, unsigned width, unsigned height)
{
switch (scale) {
case 202 :
case 2 :
scale2x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
break;
case 203 :
scale2x3(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
break;
case 204 :
scale2x4(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
break;
case 303 :
case 3 :
scale3x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
break;
case 404 :
case 4 :
scale4x(void_dst, dst_slice, void_src, src_slice, pixel, width, height);
break;
}
}