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Diffstat (limited to 'system/image/pdp_resample.c')
| -rw-r--r-- | system/image/pdp_resample.c | 204 |
1 files changed, 204 insertions, 0 deletions
diff --git a/system/image/pdp_resample.c b/system/image/pdp_resample.c new file mode 100644 index 0000000..d2ffbcd --- /dev/null +++ b/system/image/pdp_resample.c @@ -0,0 +1,204 @@ +/* + * Pure Data Packet system file. - image resampling routines + * Copyright (c) by Tom Schouten <pdp@zzz.kotnet.org> + * + * 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. + * + */ + + +#include "pdp_resample.h" +#include "pdp.h" +#include <string.h> + +/* + +efficient bilinear resampling ?? +performance: how to eliminate divides? -> virtual coordinates 2^k x 2^k (conf. opengl) + +i.e. 16 bit virtual coordinates: easy modular addressing + +*/ + + +/* code in this file should go out to be replaced by code in pdp_imageproc */ + +static s32 pdp_resample_bilin(s16 *image, s32 width, s32 height, s32 virt_x, s32 virt_y) +{ + + s32 fp_x, fp_y, frac_x, frac_y, f, offset, r_1, r_2; + + virt_x &= 0xffff; + virt_y &= 0xffff; + + fp_x = virt_x * (width - 1); + fp_y = virt_y * (height - 1); + + frac_x = fp_x & (0xffff); + frac_y = fp_y & (0xffff); + + offset = (fp_x >> 16) + (fp_y >> 16) * width; + image += offset; + + f = 0x10000 - frac_x; + + r_1 = ((f * (s32)(image[0]) + frac_x * (s32)(image[1])))>>16; + + image += width; + + r_2 = ((f * (s32)(image[0]) + frac_x * (s32)(image[1])))>>16; + + f = 0x10000 - frac_y; + + return ((f * r_1 + frac_y * r_2)>>16); + +} + + +void pdp_resample_scale_bilin(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h) +{ + s32 i,j; + s32 virt_x=0; + s32 virt_y=0; /* virtual coordinates in 30 bit */ + s32 scale_x = 0x40000000 / dst_w; + s32 scale_y = 0x40000000 / dst_h; + + for (j=0; j<dst_h; j++){ + for (i=0; i<dst_w; i++){ + *dst_image++ = pdp_resample_bilin(src_image, src_w, src_h, virt_x>>14, virt_y>>14); + virt_x += scale_x; + } + virt_x = 0; + virt_y += scale_y; + } + +} + +void pdp_resample_scale_nn(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h) +{ + s32 i,j; + s32 x=0; + s32 y=0; + s32 frac_x=0; + s32 frac_y=0; + s32 scale_x = (src_w << 20 ) / dst_w; + s32 scale_y = (src_h << 20 ) / dst_h; + + for (j=0; j<dst_h; j++){ + for (i=0; i<dst_w; i++){ + *dst_image++ = src_image[x+y]; + frac_x += scale_x; + x = frac_x >> 20; + } + x = 0; + frac_x = 0; + frac_y += scale_y; + y = (frac_y >> 20) * src_w; + } + +} + +/* USE pdp_resample_affinemap +void pdp_resample_zoom_tiled_bilin(s16 *src_image, s16 *dst_image, s32 w, s32 h, + float zoom_x, float zoom_y, float center_x_relative, float center_y_relative) +{ + float izx = 1.0f / zoom_x; + float izy = 1.0f / zoom_y; + s32 scale_x = (s32)((float)0x100000 * izx / (float)w); + s32 scale_y = (s32)((float)0x100000 * izy / (float)h); + + s32 top_virt_x = (s32)((1.0f - izx) * (float)0x100000 * center_x_relative); + s32 top_virt_y = (s32)((1.0f - izy) * (float)0x100000 * center_y_relative); + + s32 virt_x = top_virt_x; + s32 virt_y = top_virt_y; + + s32 i,j; + + for (j=0; j<h; j++){ + for (i=0; i<w; i++){ + *dst_image++ = pdp_resample_bilin(src_image, w, h, virt_x>>4, virt_y>>4); + virt_x += scale_x; + } + virt_x = top_virt_x; + virt_y += scale_y; + } + +} +*/ + +void pdp_resample_halve(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h) +{ + + int dst_x,dst_y; + int src_x = 0; + int src_y = 0; + int dst_w = src_w >> 1; + int dst_h = src_h >> 1; + s32 tmp1,tmp2,tmp3,tmp4; + + //post("%x %x %d %d\n", src_image, dst_image, src_w, src_h); + + for(dst_y = 0; dst_y < dst_h * dst_w; dst_y += dst_w){ + for (dst_x = 0; dst_x < dst_w; dst_x++){ + + tmp1 = (s32)src_image[src_y + src_x]; + tmp2 = (s32)src_image[src_y + src_x + 1]; + tmp3 = (s32)src_image[src_y + src_x + src_w]; + tmp4 = (s32)src_image[src_y + src_x + src_w + 1]; + + tmp1 += tmp2; + tmp3 += tmp4; + + src_x += 2; + + dst_image[dst_x+dst_y] = (s16)((tmp1 + tmp3)>>2); + } + src_y += src_w << 1; + src_x = 0; + } +} + +void pdp_resample_double(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h) +{ + int src_x = 0; + int src_y = 0; + int dst = 0; + int dst_w = src_w << 1; + + s16 tmp; + + for(src_y = 0; src_y < src_h * src_w; src_y += src_w){ + for (src_x = 0; src_x < src_w; src_x++){ + + tmp = *src_image++; + dst = (src_y << 2) + (src_x << 1); + dst_image[dst] = tmp; + dst_image[dst+1] = tmp; + dst+=dst_w; + dst_image[dst] = tmp; + dst_image[dst+1] = tmp; + } + } +} + +/* $$$TODO: finish this */ +void pdp_resample_padcrop(s16 *src_image, s16 *dst_image, s32 src_w, s32 src_h, s32 dst_w, s32 dst_h) +{ + + int shift_x = (dst_w - src_w) / 2; + int shift_y = (dst_h - src_h) / 2; +} + |