?? resize.c
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#include <stdio.h>#include <libxml/parser.h>#include "config.h"#define MODULE_FILTER#include "module.h"#include "image.h"#include "xmlhelp.h"#include "log.h"#define MODNAME "resize"static struct image *resize_get_dim(struct image *, xmlNodePtr);char *name = MODNAME;char *version = VERSION;intfilter(struct image *img, xmlNodePtr node, void **ctx){ struct image work; double xratio, yratio; unsigned int x, y, rx, ry; unsigned char *r, *rline, *w; if (!*ctx) { *ctx = resize_get_dim(img, node); if (!*ctx) { log_log(MODNAME, "Invalid/missing resize parameters\n"); return -1; } } memcpy(&work, *ctx, sizeof(work)); image_new(&work, work.x, work.y); w = work.buf; xratio = (double) img->x / work.x; yratio = (double) img->y / work.y; for (y = 0; y < work.y; y++) { ry = yratio * y; rline = img->buf + ry * img->x * 3; for (x = 0; x < work.x; x++) { rx = xratio * x; r = rline + rx * 3; *w++ = *r++; *w++ = *r++; *w++ = *r++; } } image_move(img, &work); return 0;}staticstruct image *resize_get_dim(struct image *oriimg, xmlNodePtr node){ double scale; struct image ret; struct image *retptr; memcpy(&ret, oriimg, sizeof(ret)); for (node = node->xml_children; node; node = node->next) { if (xml_isnode(node, "width")) ret.x = xml_atoi(node, ret.x); else if (xml_isnode(node, "height")) ret.y = xml_atoi(node, ret.y); else if (xml_isnode(node, "scale")) { scale = xml_atof(node, 0); if (scale <= 0) continue; ret.x = (ret.x * scale) / 100; ret.y = (ret.y * scale) / 100; } } if (ret.x == 0 || ret.y == 0) return NULL; retptr = malloc(sizeof(*retptr)); memcpy(retptr, &ret, sizeof(*retptr)); return retptr;}?? 快捷鍵說(shuō)明
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