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- // VisualBoyAdvance - Nintendo Gameboy/GameboyAdvance (TM) emulator.
- // Copyright (C) 1999-2003 Forgotten
- // Copyright (C) 2004 Forgotten and the VBA development team
-
- // 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, 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
-
- /** Code adapted from Exult source code by Forgotten
- ** Scale.cc - Trying to scale with bilinear interpolation.
- **
- ** Written: 6/14/00 - JSF
- **/
-
- #include "System.h"
-
- static u8 row_cur[3*322];
- static u8 row_next[3*322];
-
- static u8 *rgb_row_cur = row_cur;
- static u8 *rgb_row_next = row_next;
-
- #define RGB(r,g,b) ((r)>>3) << systemRedShift |\
- ((g) >> 3) << systemGreenShift |\
- ((b) >> 3) << systemBlueShift\
-
- static void fill_rgb_row_16(u16 *from, int src_width, u8 *row, int width)
- {
- u8 *copy_start = row + src_width*3;
- u8 *all_stop = row + width*3;
- while (row < copy_start) {
- u16 color = *from++;
- *row++ = ((color >> systemRedShift) & 0x1f) << 3;
- *row++ = ((color >> systemGreenShift) & 0x1f) << 3;
- *row++ = ((color >> systemBlueShift) & 0x1f) << 3;
- }
- // any remaining elements to be written to 'row' are a replica of the
- // preceding pixel
- u8 *p = row-3;
- while (row < all_stop) {
- // we're guaranteed three elements per pixel; could unroll the loop
- // further, especially with a Duff's Device, but the gains would be
- // probably limited (judging by profiler output)
- *row++ = *p++;
- *row++ = *p++;
- *row++ = *p++;
- }
- }
-
- static void fill_rgb_row_32(u32 *from, int src_width, u8 *row, int width)
- {
- u8 *copy_start = row + src_width*3;
- u8 *all_stop = row + width*3;
- while (row < copy_start) {
- u32 color = *from++;
- *row++ = ((color >> systemRedShift) & 0x1f) << 3;
- *row++ = ((color >> systemGreenShift) & 0x1f) << 3;
- *row++ = ((color >> systemBlueShift) & 0x1f) << 3;
- }
- // any remaining elements to be written to 'row' are a replica of the
- // preceding pixel
- u8 *p = row-3;
- while (row < all_stop) {
- // we're guaranteed three elements per pixel; could unroll the loop
- // further, especially with a Duff's Device, but the gains would be
- // probably limited (judging by profiler output)
- *row++ = *p++;
- *row++ = *p++;
- *row++ = *p++;
- }
- }
-
- void Bilinear(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
- u8 *dstPtr, u32 dstPitch, int width, int height)
- {
- u16 *to = (u16 *)dstPtr;
- u16 *to_odd = (u16 *)(dstPtr + dstPitch);
-
- int from_width = width;
- u16 *from = (u16 *)srcPtr;
- fill_rgb_row_16(from, from_width, rgb_row_cur, width+1);
-
- for(int y = 0; y < height; y++) {
- u16 *from_orig = from;
- u16 *to_orig = to;
-
- if (y+1 < height)
- fill_rgb_row_16(from+width+2, from_width, rgb_row_next,
- width+1);
- else
- fill_rgb_row_16(from, from_width, rgb_row_next, width+1);
-
- // every pixel in the src region, is extended to 4 pixels in the
- // destination, arranged in a square 'quad'; if the current src
- // pixel is 'a', then in what follows 'b' is the src pixel to the
- // right, 'c' is the src pixel below, and 'd' is the src pixel to
- // the right and down
- u8 *cur_row = rgb_row_cur;
- u8 *next_row = rgb_row_next;
- u8 *ar = cur_row++;
- u8 *ag = cur_row++;
- u8 *ab = cur_row++;
- u8 *cr = next_row++;
- u8 *cg = next_row++;
- u8 *cb = next_row++;
- for(int x=0; x < width; x++) {
- u8 *br = cur_row++;
- u8 *bg = cur_row++;
- u8 *bb = cur_row++;
- u8 *dr = next_row++;
- u8 *dg = next_row++;
- u8 *db = next_row++;
-
- // upper left pixel in quad: just copy it in
- *to++ = RGB(*ar, *ag, *ab);
-
- // upper right
- *to++ = RGB((*ar+*br)>>1, (*ag+*bg)>>1, (*ab+*bb)>>1);
-
- // lower left
- *to_odd++ = RGB((*ar+*cr)>>1, (*ag+*cg)>>1, (*ab+*cb)>>1);
-
- // lower right
- *to_odd++ = RGB((*ar+*br+*cr+*dr)>>2,
- (*ag+*bg+*cg+*dg)>>2,
- (*ab+*bb+*cb+*db)>>2);
-
- // 'b' becomes 'a', 'd' becomes 'c'
- ar = br;
- ag = bg;
- ab = bb;
- cr = dr;
- cg = dg;
- cb = db;
- }
-
- // the "next" rgb row becomes the current; the old current rgb row is
- // recycled and serves as the new "next" row
- u8 *temp;
- temp = rgb_row_cur;
- rgb_row_cur = rgb_row_next;
- rgb_row_next = temp;
-
- // update the pointers for start of next pair of lines
- from = (u16 *)((u8 *)from_orig + srcPitch);
- to = (u16 *)((u8 *)to_orig + (dstPitch << 1));
- to_odd = (u16 *)((u8 *)to + dstPitch);
- }
- }
-
- void BilinearPlus(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
- u8 *dstPtr, u32 dstPitch, int width, int height)
- {
- u16 *to = (u16 *)dstPtr;
- u16 *to_odd = (u16 *)(dstPtr + dstPitch);
-
- int from_width = width;
- u16 *from = (u16 *)srcPtr;
- fill_rgb_row_16(from, from_width, rgb_row_cur, width+1);
-
- for(int y = 0; y < height; y++) {
- u16 *from_orig = from;
- u16 *to_orig = to;
-
- if (y+1 < height)
- fill_rgb_row_16(from+width+2, from_width, rgb_row_next,
- width+1);
- else
- fill_rgb_row_16(from, from_width, rgb_row_next, width+1);
-
- // every pixel in the src region, is extended to 4 pixels in the
- // destination, arranged in a square 'quad'; if the current src
- // pixel is 'a', then in what follows 'b' is the src pixel to the
- // right, 'c' is the src pixel below, and 'd' is the src pixel to
- // the right and down
- u8 *cur_row = rgb_row_cur;
- u8 *next_row = rgb_row_next;
- u8 *ar = cur_row++;
- u8 *ag = cur_row++;
- u8 *ab = cur_row++;
- u8 *cr = next_row++;
- u8 *cg = next_row++;
- u8 *cb = next_row++;
- for(int x=0; x < width; x++) {
- u8 *br = cur_row++;
- u8 *bg = cur_row++;
- u8 *bb = cur_row++;
- u8 *dr = next_row++;
- u8 *dg = next_row++;
- u8 *db = next_row++;
-
- // upper left pixel in quad: just copy it in
- //*to++ = manip.rgb(*ar, *ag, *ab);
- #ifdef USE_ORIGINAL_BILINEAR_PLUS
- *to++ = RGB(
- (((*ar)<<2) +((*ar)) + (*cr+*br+*br) )>> 3,
- (((*ag)<<2) +((*ag)) + (*cg+*bg+*bg) )>> 3,
- (((*ab)<<2) +((*ab)) + (*cb+*bb+*bb) )>> 3);
- #else
- *to++ = RGB(
- (((*ar)<<3) +((*ar)<<1) + (*cr+*br+*br+*cr) )>> 4,
- (((*ag)<<3) +((*ag)<<1) + (*cg+*bg+*bg+*cg) )>> 4,
- (((*ab)<<3) +((*ab)<<1) + (*cb+*bb+*bb+*cb) )>> 4);
- #endif
-
- // upper right
- *to++ = RGB((*ar+*br)>>1, (*ag+*bg)>>1, (*ab+*bb)>>1);
-
- // lower left
- *to_odd++ = RGB((*ar+*cr)>>1, (*ag+*cg)>>1, (*ab+*cb)>>1);
-
- // lower right
- *to_odd++ = RGB((*ar+*br+*cr+*dr)>>2,
- (*ag+*bg+*cg+*dg)>>2,
- (*ab+*bb+*cb+*db)>>2);
-
- // 'b' becomes 'a', 'd' becomes 'c'
- ar = br;
- ag = bg;
- ab = bb;
- cr = dr;
- cg = dg;
- cb = db;
- }
-
- // the "next" rgb row becomes the current; the old current rgb row is
- // recycled and serves as the new "next" row
- u8 *temp;
- temp = rgb_row_cur;
- rgb_row_cur = rgb_row_next;
- rgb_row_next = temp;
-
- // update the pointers for start of next pair of lines
- from = (u16 *)((u8 *)from_orig + srcPitch);
- to = (u16 *)((u8 *)to_orig + (dstPitch << 1));
- to_odd = (u16 *)((u8 *)to + dstPitch);
- }
- }
-
- void Bilinear32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
- u8 *dstPtr, u32 dstPitch, int width, int height)
- {
- u32 *to = (u32 *)dstPtr;
- u32 *to_odd = (u32 *)(dstPtr + dstPitch);
-
- int from_width = width;
- if(width+1 < from_width)
- from_width = width+1;
- u32 *from = (u32 *)srcPtr;
- fill_rgb_row_32(from, from_width, rgb_row_cur, width+1);
-
- for(int y = 0; y < height; y++) {
- u32 *from_orig = from;
- u32 *to_orig = to;
-
- if (y+1 < height)
- fill_rgb_row_32(from+width+1, from_width, rgb_row_next,
- width+1);
- else
- fill_rgb_row_32(from, from_width, rgb_row_next, width+1);
-
- // every pixel in the src region, is extended to 4 pixels in the
- // destination, arranged in a square 'quad'; if the current src
- // pixel is 'a', then in what follows 'b' is the src pixel to the
- // right, 'c' is the src pixel below, and 'd' is the src pixel to
- // the right and down
- u8 *cur_row = rgb_row_cur;
- u8 *next_row = rgb_row_next;
- u8 *ar = cur_row++;
- u8 *ag = cur_row++;
- u8 *ab = cur_row++;
- u8 *cr = next_row++;
- u8 *cg = next_row++;
- u8 *cb = next_row++;
- for(int x=0; x < width; x++) {
- u8 *br = cur_row++;
- u8 *bg = cur_row++;
- u8 *bb = cur_row++;
- u8 *dr = next_row++;
- u8 *dg = next_row++;
- u8 *db = next_row++;
-
- // upper left pixel in quad: just copy it in
- *to++ = RGB(*ar, *ag, *ab);
-
- // upper right
- *to++ = RGB((*ar+*br)>>1, (*ag+*bg)>>1, (*ab+*bb)>>1);
-
- // lower left
- *to_odd++ = RGB((*ar+*cr)>>1, (*ag+*cg)>>1, (*ab+*cb)>>1);
-
- // lower right
- *to_odd++ = RGB((*ar+*br+*cr+*dr)>>2,
- (*ag+*bg+*cg+*dg)>>2,
- (*ab+*bb+*cb+*db)>>2);
-
- // 'b' becomes 'a', 'd' becomes 'c'
- ar = br;
- ag = bg;
- ab = bb;
- cr = dr;
- cg = dg;
- cb = db;
- }
-
- // the "next" rgb row becomes the current; the old current rgb row is
- // recycled and serves as the new "next" row
- u8 *temp;
- temp = rgb_row_cur;
- rgb_row_cur = rgb_row_next;
- rgb_row_next = temp;
-
- // update the pointers for start of next pair of lines
- from = (u32 *)((u8 *)from_orig + srcPitch);
- to = (u32 *)((u8 *)to_orig + (dstPitch << 1));
- to_odd = (u32 *)((u8 *)to + dstPitch);
- }
- }
-
- void BilinearPlus32(u8 *srcPtr, u32 srcPitch, u8 * /* deltaPtr */,
- u8 *dstPtr, u32 dstPitch, int width, int height)
- {
- u32 *to = (u32 *)dstPtr;
- u32 *to_odd = (u32 *)(dstPtr + dstPitch);
-
- int from_width = width;
- if(width+1 < from_width)
- from_width = width+1;
- u32 *from = (u32 *)srcPtr;
- fill_rgb_row_32(from, from_width, rgb_row_cur, width+1);
-
- for(int y = 0; y < height; y++) {
- u32 *from_orig = from;
- u32 *to_orig = to;
-
- if (y+1 < height)
- fill_rgb_row_32(from+width+1, from_width, rgb_row_next,
- width+1);
- else
- fill_rgb_row_32(from, from_width, rgb_row_next, width+1);
-
- // every pixel in the src region, is extended to 4 pixels in the
- // destination, arranged in a square 'quad'; if the current src
- // pixel is 'a', then in what follows 'b' is the src pixel to the
- // right, 'c' is the src pixel below, and 'd' is the src pixel to
- // the right and down
- u8 *cur_row = rgb_row_cur;
- u8 *next_row = rgb_row_next;
- u8 *ar = cur_row++;
- u8 *ag = cur_row++;
- u8 *ab = cur_row++;
- u8 *cr = next_row++;
- u8 *cg = next_row++;
- u8 *cb = next_row++;
- for(int x=0; x < width; x++) {
- u8 *br = cur_row++;
- u8 *bg = cur_row++;
- u8 *bb = cur_row++;
- u8 *dr = next_row++;
- u8 *dg = next_row++;
- u8 *db = next_row++;
-
- // upper left pixel in quad: just copy it in
- //*to++ = manip.rgb(*ar, *ag, *ab);
- #ifdef USE_ORIGINAL_BILINEAR_PLUS
- *to++ = RGB(
- (((*ar)<<2) +((*ar)) + (*cr+*br+*br) )>> 3,
- (((*ag)<<2) +((*ag)) + (*cg+*bg+*bg) )>> 3,
- (((*ab)<<2) +((*ab)) + (*cb+*bb+*bb) )>> 3);
- #else
- *to++ = RGB(
- (((*ar)<<3) +((*ar)<<1) + (*cr+*br+*br+*cr) )>> 4,
- (((*ag)<<3) +((*ag)<<1) + (*cg+*bg+*bg+*cg) )>> 4,
- (((*ab)<<3) +((*ab)<<1) + (*cb+*bb+*bb+*cb) )>> 4);
- #endif
-
- // upper right
- *to++ = RGB((*ar+*br)>>1, (*ag+*bg)>>1, (*ab+*bb)>>1);
-
- // lower left
- *to_odd++ = RGB((*ar+*cr)>>1, (*ag+*cg)>>1, (*ab+*cb)>>1);
-
- // lower right
- *to_odd++ = RGB((*ar+*br+*cr+*dr)>>2,
- (*ag+*bg+*cg+*dg)>>2,
- (*ab+*bb+*cb+*db)>>2);
-
- // 'b' becomes 'a', 'd' becomes 'c'
- ar = br;
- ag = bg;
- ab = bb;
- cr = dr;
- cg = dg;
- cb = db;
- }
-
- // the "next" rgb row becomes the current; the old current rgb row is
- // recycled and serves as the new "next" row
- u8 *temp;
- temp = rgb_row_cur;
- rgb_row_cur = rgb_row_next;
- rgb_row_next = temp;
-
- // update the pointers for start of next pair of lines
- from = (u32 *)((u8 *)from_orig + srcPitch);
- to = (u32 *)((u8 *)to_orig + (dstPitch << 1));
- to_odd = (u32 *)((u8 *)to + dstPitch);
- }
- }
-
-