/* * upscale.c image upscaling * * This file contains upscalers for picodrive. * * scaler types: * nn: nearest neighbour * snn: "smoothed" nearest neighbour (see below) * bln: n-level-bilinear with n quantized weights * quantization: 0: a<1/(2*n), 1/n: 1/(2*n)<=a<3/(2*n), etc * currently n=2, n=4 are implemented (there's n=8 mixing, but no filters) * [NB this has been brought to my attn, which is probably the same as bl2: * https://www.drdobbs.com/image-scaling-with-bresenham/184405045?pgno=1] * * "smoothed" nearest neighbour: uses the average of the source pixels if no * source pixel covers more than 65% of the result pixel. It definitely * looks better than nearest neighbour and is still quite fast. It creates * a sharper look than a bilinear filter, at the price of some visible jags * on diagonal edges. * * example scaling modes: * 256x_Y_ -> 320x_Y_, H32/mode 4, PAR 5:4, for PAL DAR 4:3 (NTSC 7% aspect err) * 256x224 -> 320x240, H32/mode 4, PAR 5:4, for NTSC DAR 4:3 (PAL 7% aspect err) * 320x224 -> 320x240, PAR 1:1, for NTSC, DAR 4:3 (PAL 7% etc etc...) * 160x144 -> 320x240: GG, PAR 6:5, scaling to 320x240 for DAR 4:3 * * (C) 2021 kub * * This work is licensed under the terms of any of these licenses * (at your option): * - GNU GPL, version 2 or later. * - MAME license. */ #include "upscale.h" /* X x Y -> X*5/4 x Y */ void upscale_clut_nn_x_4_5(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int y; for (y = 0; y < height; y++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_nop); } } void upscale_rgb_nn_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_pal); } } void upscale_rgb_snn_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_snn_4_5(di, ds, si, ss, width, f_pal); } } void upscale_rgb_bl2_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_bl2_4_5(di, ds, si, ss, width, f_pal); } } void upscale_rgb_bl4_x_4_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_bl4_4_5(di, ds, si, ss, width, f_pal); } } /* X x Y -> X*5/4 x Y*17/16 */ void upscale_clut_nn_x_4_5_y_16_17(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_nop); } di += ds; for (j = 0; j < 8; j++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_nop); } di -= 9*ds; v_copy(&di[0], &di[-ds], swidth, f_nop); di += 9*ds; } } void upscale_rgb_nn_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 8; j++) { h_upscale_nn_4_5(di, ds, si, ss, width, f_pal); } di -= 9*ds; v_copy(&di[0], &di[-ds], swidth, f_nop); di += 9*ds; } } void upscale_rgb_snn_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_upscale_snn_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 8; j++) { h_upscale_snn_4_5(di, ds, si, ss, width, f_pal); } /* mix lines 6-8 */ di -= 9*ds; v_mix(&di[0], &di[-ds], &di[ds], swidth, p_05, f_nop); v_mix(&di[-ds], &di[-2*ds], &di[-ds], swidth, p_05, f_nop); v_mix(&di[ ds], &di[ ds], &di[ 2*ds], swidth, p_05, f_nop); di += 9*ds; } } void upscale_rgb_bl2_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 4; j++) { h_upscale_bl2_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 12; j++) { h_upscale_bl2_4_5(di, ds, si, ss, width, f_pal); } /* mix lines 3-10 */ di -= 13*ds; v_mix(&di[0], &di[-ds], &di[ds], swidth, p_05, f_nop); for (j = 0; j < 7; j++) { di += ds; v_mix(&di[0], &di[0], &di[ds], swidth, p_05, f_nop); } di += 6*ds; } } void upscale_rgb_bl4_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 2; j++) { h_upscale_bl4_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 14; j++) { h_upscale_bl4_4_5(di, ds, si, ss, width, f_pal); } di -= 15*ds; /* mixing line 2: line 1 = -ds, line 2 = +ds */ v_mix(&di[0], &di[-ds], &di[ds], swidth, p_025, f_nop); di += ds; /* mixing lines 3-5: line n-1 = 0, line n = +ds */ for (j = 0; j < 3; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_025, f_nop); di += ds; } /* mixing lines 6-9 */ for (j = 0; j < 4; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_05, f_nop); di += ds; } /* mixing lines 10-13 */ for (j = 0; j < 4; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_075, f_nop); di += ds; } /* lines 14-16, already in place */ di += 3*ds; } } /* "classic" upscaler as found in several emulators. It's really more like a * x*4/3, y*16/15 upscaler, with an additional 5th row/17th line just inserted * from the source image. That gives nice n/4,n/16 alpha values plus better * symmetry in each block and avoids "borrowing" a row/line between blocks. */ void upscale_rgb_bln_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 4; j++) { h_upscale_bln_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 12; j++) { h_upscale_bln_4_5(di, ds, si, ss, width, f_pal); } di -= 13*ds; /* mixing line 4: line 3 = -ds, line 4 = +ds */ v_mix(&di[0], &di[-ds], &di[ds], swidth, p_025, f_nop); di += ds; /* mixing lines 5-6: line n-1 = 0, line n = +ds */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_025, f_nop); di += ds; } /* mixing line 7-9 */ for (j = 0; j < 3; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_05, f_nop); di += ds; } /* mixing lines 10-12 */ for (j = 0; j < 3; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_075, f_nop); di += ds; } /* lines 13-16, already in place */ di += 4*ds; } } /* experimental 8 level bilinear for quality assessment */ void upscale_rgb_bl8_x_4_5_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 5/4; int y, j; for (y = 0; y < 224; y += 16) { for (j = 0; j < 2; j++) { h_upscale_bl8_4_5(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 14; j++) { h_upscale_bl8_4_5(di, ds, si, ss, width, f_pal); } di -= 15*ds; /* mixing line 2: line 2 = -ds, line 3 = +ds */ v_mix(&di[0], &di[-ds], &di[ds], swidth, p_0125, f_nop); di += ds; /* mixing line 3: line 3 = 0, line 4 = +ds */ v_mix(&di[0], &di[0], &di[ds], swidth, p_0125, f_nop); di += ds; /* mixing lines 4-5: line n-1 = 0, line n = +ds */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], swidth, p_025, f_nop); di += ds; } /* mixing lines 6-7 */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], 320, p_0375, f_nop); di += ds; } /* mixing lines 8-9 */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], 320, p_05, f_nop); di += ds; } /* mixing lines 10-11 */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], 320, p_0625, f_nop); di += ds; } /* mixing lines 12-13 */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], 320, p_075, f_nop); di += ds; } /* mixing lines 14-15 */ for (j = 0; j < 2; j++) { v_mix(&di[0], &di[0], &di[ds], 320, p_0875, f_nop); di += ds; } /* line 16, already in place */ di += ds; } } /* X x Y -> X x Y*17/16 */ void upscale_clut_nn_y_16_17(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_nop); } di += ds; for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_nop); } di -= 9*ds; v_copy(&di[0], &di[-ds], width, f_nop); di += 9*ds; } } void upscale_rgb_nn_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_pal); } di -= 9*ds; v_copy(&di[0], &di[-ds], width, f_nop); di += 9*ds; } } void upscale_rgb_snn_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 8; j++) { h_copy(di, ds, si, ss, width, f_pal); } /* mix lines 6-8 */ di -= 9*ds; v_mix(&di[0], &di[-ds], &di[ds], width, p_05, f_nop); v_mix(&di[-ds], &di[-2*ds], &di[-ds], width, p_05, f_nop); v_mix(&di[ ds], &di[ ds], &di[ 2*ds], width, p_05, f_nop); di += 9*ds; } } void upscale_rgb_bl2_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 4; j++) { h_copy(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 12; j++) { h_copy(di, ds, si, ss, width, f_pal); } /* mix lines 4-11 */ di -= 13*ds; v_mix(&di[0], &di[-ds], &di[ds], width, p_05, f_nop); for (j = 0; j < 7; j++) { di += ds; v_mix(&di[0], &di[0], &di[ds], width, p_05, f_nop); } di += 6*ds; } } void upscale_rgb_bl4_y_16_17(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 16) { for (j = 0; j < 2; j++) { h_copy(di, ds, si, ss, width, f_pal); } di += ds; for (j = 0; j < 14; j++) { h_copy(di, ds, si, ss, width, f_pal); } di -= 15*ds; /* mixing line 2: line 1 = -ds, line 2 = +ds */ v_mix(&di[0], &di[-ds], &di[ds], width, p_025, f_nop); di += ds; /* mixing lines 3-5: line n-1 = 0, line n = +ds */ for (j = 0; j < 3; j++) { v_mix(&di[0], &di[0], &di[ds], width, p_025, f_nop); di += ds; } /* mixing lines 6-9 */ for (j = 0; j < 4; j++) { v_mix(&di[0], &di[0], &di[ds], width, p_05, f_nop); di += ds; } /* mixing lines 10-13 */ for (j = 0; j < 4; j++) { v_mix(&di[0], &di[0], &di[ds], width, p_075, f_nop); di += ds; } /* lines 14-16, already in place */ di += 3*ds; } } /* X x Y -> X*2/1 x Y, e.g. for X 160->320 (GG) */ void upscale_clut_nn_x_1_2(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int y; for (y = 0; y < height; y++) { h_upscale_nn_1_2(di, ds, si, ss, width, f_nop); } } void upscale_rgb_nn_x_1_2(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_nn_1_2(di, ds, si, ss, width, f_pal); } } void upscale_rgb_bl2_x_1_2(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y; for (y = 0; y < height; y++) { h_upscale_bl2_1_2(di, ds, si, ss, width, f_pal); } } /* X x Y -> X*2/1 x Y*5/3 (GG) */ void upscale_clut_nn_x_1_2_y_3_5(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int swidth = width * 2; int y, j; for (y = 0; y < height; y += 3) { /* lines 0,2,4 */ for (j = 0; j < 3; j++) { h_upscale_nn_1_2(di, ds, si, ss, width, f_nop); di += ds; } /* lines 1,3 */ di -= 5*ds; for (j = 0; j < 2; j++) { v_copy(&di[0], &di[-ds], swidth, f_nop); di += 2*ds; } } } void upscale_rgb_nn_x_1_2_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 2; int y, j; for (y = 0; y < height; y += 3) { for (j = 0; j < 3; j++) { h_upscale_nn_1_2(di, ds, si, ss, width, f_pal); di += ds; } di -= 5*ds; for (j = 0; j < 2; j++) { v_copy(&di[0], &di[-ds], swidth, f_nop); di += 2*ds; } } } void upscale_rgb_bl2_x_1_2_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 2; int y, j; for (y = 0; y < height; y += 3) { for (j = 0; j < 3; j++) { h_upscale_bl2_1_2(di, ds, si, ss, width, f_pal); di += ds; } di -= 5*ds; for (j = 0; j < 2; j++) { v_mix(&di[0], &di[-ds], &di[ds], swidth, p_05, f_nop); di += 2*ds; } } } void upscale_rgb_bl4_x_1_2_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int swidth = width * 2; int y, j, d; /* for 1st block backwards reference virtually duplicate source line 0 */ for (y = 0, d = 2*ds; y < height; y += 3, d = -ds) { di += 2*ds; for (j = 0; j < 3; j++) { h_upscale_bl2_1_2(di, ds, si, ss, width, f_pal); } di -= 5*ds; v_mix(&di[0], &di[d ], &di[2*ds], swidth, p_05, f_nop); /*-1+0 */ di += ds; v_mix(&di[0], &di[ds], &di[2*ds], swidth, p_075, f_nop);/* 0+1 */ di += ds; v_mix(&di[0], &di[ 0], &di[ ds], swidth, p_025, f_nop);/* 0+1 */ di += ds; v_mix(&di[0], &di[ 0], &di[ ds], swidth, p_05, f_nop); /* 1+2 */ di += 2*ds; } } /* X x Y -> X x Y*5/3, e.g. for Y 144->240 (GG) */ void upscale_clut_nn_y_3_5(u8 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height) { int y, j; for (y = 0; y < height; y += 3) { /* lines 0,2,4 */ for (j = 0; j < 3; j++) { h_copy(di, ds, si, ss, width, f_nop); di += ds; } /* lines 1,3 */ di -= 5*ds; for (j = 0; j < 2; j++) { v_copy(&di[0], &di[-ds], width, f_nop); di += 2*ds; } } } void upscale_rgb_nn_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 3) { for (j = 0; j < 3; j++) { h_copy(di, ds, si, ss, width, f_pal); di += ds; } di -= 5*ds; for (j = 0; j < 2; j++) { v_copy(&di[0], &di[-ds], width, f_nop); di += 2*ds; } } } void upscale_rgb_bl2_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j; for (y = 0; y < height; y += 3) { for (j = 0; j < 3; j++) { h_copy(di, ds, si, ss, width, f_pal); di += ds; } di -= 5*ds; for (j = 0; j < 2; j++) { v_mix(&di[0], &di[-ds], &di[ds], width, p_05, f_nop); di += 2*ds; } } } void upscale_rgb_bl4_y_3_5(u16 *__restrict di, int ds, u8 *__restrict si, int ss, int width, int height, u16 *pal) { int y, j, d; /* for 1st block backwards reference virtually duplicate source line 0 */ for (y = 0, d = 2*ds; y < height; y += 3, d = -ds) { di += 2*ds; for (j = 0; j < 3; j++) { h_copy(di, ds, si, ss, width, f_pal); } di -= 5*ds; v_mix(&di[0], &di[d ], &di[2*ds], width, p_05, f_nop); /*-1+0 */ di += ds; v_mix(&di[0], &di[ds], &di[2*ds], width, p_075, f_nop);/* 0+1 */ di += ds; v_mix(&di[0], &di[ 0], &di[ ds], width, p_025, f_nop);/* 0+1 */ di += ds; v_mix(&di[0], &di[ 0], &di[ ds], width, p_05, f_nop); /* 1+2 */ di += 2*ds; } }