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- /* raster.c - main and other misc stuff
- *
- * Raster graphics library
- *
- * Copyright (c) 1997-2000 Alfredo K. Kojima
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; if not, write to the Free
- * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- */
-
- #include <config.h>
-
- #include <stdlib.h>
- #include <stdio.h>
- #include <string.h>
- #include <X11/Xlib.h>
- #include "wraster.h"
-
- #include <assert.h>
-
-
- char *WRasterLibVersion="0.9";
-
- int RErrorCode=RERR_NONE;
-
-
- #define HAS_ALPHA(I) ((I)->format == RRGBAFormat)
-
-
- RImage*
- RCreateImage(unsigned width, unsigned height, int alpha)
- {
- RImage *image=NULL;
-
- assert(width>0 && height>0);
-
- image = malloc(sizeof(RImage));
- if (!image) {
- RErrorCode = RERR_NOMEMORY;
- return NULL;
- }
-
- memset(image, 0, sizeof(RImage));
- image->width = width;
- image->height = height;
- if (alpha) {
- image->format = RRGBAFormat;
- } else {
- image->format = RRGBFormat;
- }
- /* the +4 is to give extra bytes at the end of the buffer,
- * so that we can optimize image conversion for MMX(tm).. see convert.c
- */
- image->data = malloc(width * height * (alpha ? 4 : 3) + 4);
- if (!image->data) {
- RErrorCode = RERR_NOMEMORY;
- free(image);
- image = NULL;
- }
-
- return image;
- }
-
-
-
- RImage*
- RCloneImage(RImage *image)
- {
- RImage *new_image;
-
- assert(image!=NULL);
-
- new_image = RCreateImage(image->width, image->height, HAS_ALPHA(image));
- if (!new_image)
- return NULL;
-
- new_image->background = image->background;
- memcpy(new_image->data, image->data,
- image->width*image->height*(HAS_ALPHA(image) ? 4 : 3));
-
- return new_image;
- }
-
-
- RImage*
- RGetSubImage(RImage *image, int x, int y, unsigned width, unsigned height)
- {
- int i, ofs;
- RImage *new_image;
- unsigned total_line_size, line_size;
-
- assert(image!=NULL);
- assert(x>=0 && y>=0);
- assert(x<image->width && y<image->height);
- assert(width>0 && height>0);
-
- if (x+width > image->width)
- width = image->width-x;
- if (y+height > image->height)
- height = image->height-y;
-
- new_image = RCreateImage(width, height, HAS_ALPHA(image));
-
- if (!new_image)
- return NULL;
- new_image->background = image->background;
-
- total_line_size = image->width * (HAS_ALPHA(image) ? 4 : 3);
- line_size = width * (HAS_ALPHA(image) ? 4 : 3);
-
- ofs = x*(HAS_ALPHA(image) ? 4 : 3) + y*total_line_size;;
-
- for (i=0; i<height; i++) {
- memcpy(&new_image->data[i*line_size],
- &image->data[i*total_line_size+ofs], line_size);
- }
- return new_image;
- }
-
-
- void
- RDestroyImage(RImage *image)
- {
- assert(image!=NULL);
-
- free(image->data);
- free(image);
- }
-
-
- /*
- *----------------------------------------------------------------------
- * RCombineImages-
- * Combines two equal sized images with alpha image. The second
- * image will be placed on top of the first one.
- *----------------------------------------------------------------------
- */
- void
- RCombineImages(RImage *image, RImage *src)
- {
- assert(image->width == src->width);
- assert(image->height == src->height);
-
- if (!HAS_ALPHA(src)) {
- if (!HAS_ALPHA(image)) {
- memcpy(image->data, src->data, image->height*image->width*3);
- } else {
- int x, y;
- unsigned char *d, *s;
-
- d = image->data;
- s = src->data;
- for (y = 0; y < image->height; y++) {
- for (x = 0; x < image->width; x++) {
- *d++ = *s++;
- *d++ = *s++;
- *d++ = *s++;
- d++;
- }
- }
- }
- } else {
- register int i;
- unsigned char *d;
- unsigned char *s;
- int alpha, calpha;
-
- d = image->data;
- s = src->data;
-
- if (!HAS_ALPHA(image)) {
- for (i=0; i<image->height*image->width; i++) {
- alpha = *(s+3);
- calpha = 255 - alpha;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- s++;
- }
- } else {
- for (i=0; i<image->height*image->width; i++) {
- alpha = *(s+3);
- calpha = 255 - alpha;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- d++; s++;
- *d++ |= *s++;
- }
- }
- }
- }
-
-
-
-
- void
- RCombineImagesWithOpaqueness(RImage *image, RImage *src, int opaqueness)
- {
- register int i;
- unsigned char *d;
- unsigned char *s;
- int c_opaqueness;
-
- assert(image->width == src->width);
- assert(image->height == src->height);
-
- d = image->data;
- s = src->data;
-
- c_opaqueness = 255 - opaqueness;
- #define OP opaqueness
- if (!HAS_ALPHA(src)) {
- int dalpha = HAS_ALPHA(image);
- #define COP c_opaqueness
- for (i=0; i < image->width*image->height; i++) {
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- d++; s++;
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- d++; s++;
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- d++; s++;
- if (dalpha) {
- d++;
- }
- }
- #undef COP
- } else {
- int tmp;
-
- if (!HAS_ALPHA(image)) {
- for (i=0; i<image->width*image->height; i++) {
- tmp = (*(s+3) * opaqueness)/256;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- s++;
- }
- } else {
- for (i=0; i<image->width*image->height; i++) {
- tmp = (*(s+3) * opaqueness)/256;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- *d = (((int)*d * (255-tmp)) + ((int)*s * tmp))/256;
- d++; s++;
- *d |= tmp;
- d++; s++;
- }
- }
- }
- #undef OP
- }
-
-
- void
- RCombineArea(RImage *image, RImage *src, int sx, int sy, unsigned width,
- unsigned height, int dx, int dy)
- {
- int x, y, dwi, swi;
- unsigned char *d;
- unsigned char *s;
- int alpha, calpha;
-
-
- assert(dy < image->height);
- assert(dx < image->width);
-
- assert(sy + height <= src->height);
- assert(sx + width <= src->width);
-
- if (width > image->width - dx)
- width = image->width - dx;
-
- if (height > image->height - dy)
- height = image->height - dy;
-
- if (!HAS_ALPHA(src)) {
- if (!HAS_ALPHA(image)) {
- swi = src->width * 3;
- dwi = image->width * 3;
-
- s = src->data + (sy*(int)src->width + sx) * 3;
- d = image->data + (dy*(int)image->width + dx) * 3;
-
- for (y=0; y < height; y++) {
- memcpy(d, s, width*3);
- d += dwi;
- s += swi;
- }
- } else {
- swi = (src->width - width) * 3;
- dwi = (image->width - width) * 4;
-
- s = src->data + (sy*(int)src->width + sx) * 3;
- d = image->data + (dy*(int)image->width + dx) * 4;
-
- for (y=0; y < height; y++) {
- for (x=0; x < width; x++) {
- *d++ = *s++;
- *d++ = *s++;
- *d++ = *s++;
- d++;
- }
- d += dwi;
- s += swi;
- }
- }
- } else {
- int dalpha = HAS_ALPHA(image);
-
- swi = (src->width - width) * 4;
- s = src->data + (sy*(int)src->width + sx) * 4;
- if (dalpha) {
- dwi = (image->width - width) * 4;
- d = image->data + (dy*(int)image->width + dx) * 4;
- } else {
- dwi = (image->width - width) * 3;
- d = image->data + (dy*(int)image->width + dx) * 3;
- }
-
- for (y=0; y < height; y++) {
- for (x=0; x < width; x++) {
- alpha = *(s+3);
- calpha = 255 - alpha;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- s++; d++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- s++; d++;
- *d = (((int)*d * calpha) + ((int)*s * alpha))/256;
- s++; d++;
- s++;
- if (dalpha)
- d++;
- }
- d += dwi;
- s += swi;
- }
- }
- }
-
-
- void
- RCombineAreaWithOpaqueness(RImage *image, RImage *src, int sx, int sy,
- unsigned width, unsigned height, int dx, int dy,
- int opaqueness)
- {
- int x, y, dwi, swi;
- int c_opaqueness;
- unsigned char *d;
- unsigned char *s;
- int dalpha = HAS_ALPHA(image);
- int dch = (dalpha ? 4 : 3);
-
- assert(dy <= image->height);
- assert(dx <= image->width);
-
- assert(sy <= height);
- assert(sx <= width);
-
-
- /* clip */
- width -= sx;
- height -= sy;
-
- if (height > image->height - dy)
- height = image->height - dy;
-
- d = image->data + dy*image->width*dch + dx;
- dwi = (image->width - width)*dch;
-
- c_opaqueness = 255 - opaqueness;
- #define OP opaqueness
- if (!HAS_ALPHA(src)) {
- #define COP c_opaqueness
-
- s = src->data + sy*src->width*3;
- swi = (src->width - width) * 3;
-
- for (y=0; y < height; y++) {
- for (x=0; x < width; x++) {
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- s++; d++;
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- s++; d++;
- *d = (((int)*d *(int)COP) + ((int)*s *(int)OP))/256;
- s++; d++;
- if (dalpha)
- d++;
- }
- d += dwi; s += swi;
- }
- #undef COP
- } else {
- int tmp;
-
- s = src->data + sy*src->width*4;
- swi = (src->width - width) * 4;
-
- for (y=0; y < height; y++) {
- for (x=0; x < width; x++) {
- tmp= (*(s+3) * opaqueness)/256;
- *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
- d++; s++;
- *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
- d++; s++;
- *d = (((int)*d *(int)(255-tmp)) + ((int)*s *(int)tmp))/256;
- d++; s++;
- s++;
- if (dalpha)
- d++;
- }
- d += dwi; s += swi;
- }
- }
- #undef OP
- }
-
-
-
- void
- RCombineImageWithColor(RImage *image, RColor *color)
- {
- register int i;
- unsigned char *d;
- int alpha, nalpha, r, g, b;
-
- d = image->data;
-
- if (!HAS_ALPHA(image)) {
- /* Image has no alpha channel, so we consider it to be all 255.
- * Thus there are no transparent parts to be filled. */
- return;
- }
- r = color->red;
- g = color->green;
- b = color->blue;
-
- for (i=0; i < image->width*image->height; i++) {
- alpha = *(d+3);
- nalpha = 255 - alpha;
-
- *d = (((int)*d * alpha) + (r * nalpha))/256;
- d++;
- *d = (((int)*d * alpha) + (g * nalpha))/256;
- d++;
- *d = (((int)*d * alpha) + (b * nalpha))/256;
- d++;
- d++;
- }
- }
-
-
-
-
- RImage*
- RMakeTiledImage(RImage *tile, unsigned width, unsigned height)
- {
- int x, y;
- unsigned w;
- unsigned long tile_size = tile->width * tile->height;
- unsigned long tx = 0;
- RImage *image;
- unsigned char *s, *d;
-
- if (width == tile->width && height == tile->height)
- image = RCloneImage(tile);
- else if (width <= tile->width && height <= tile->height)
- image = RGetSubImage(tile, 0, 0, width, height);
- else {
- int has_alpha = HAS_ALPHA(tile);
-
- image = RCreateImage(width, height, has_alpha);
-
- d = image->data;
- s = tile->data;
-
- for (y = 0; y < height; y++) {
- for (x = 0; x < width; x += tile->width) {
-
- w = (width - x < tile->width) ? width - x : tile->width;
-
- if (has_alpha) {
- w *= 4;
- memcpy(d, s+tx*4, w);
- } else {
- w *= 3;
- memcpy(d, s+tx*3, w);
- }
- d += w;
- }
-
- tx = (tx + tile->width) % tile_size;
- }
- }
- return image;
- }
-
-
- RImage*
- RMakeCenteredImage(RImage *image, unsigned width, unsigned height, RColor *color)
- {
- int x, y, w, h, sx, sy;
- RImage *tmp;
-
- tmp = RCreateImage(width, height, False);
- if (!tmp) {
- return NULL;
- }
-
- RClearImage(tmp, color);
-
- if (image->height < height) {
- h = image->height;
- y = (height - h)/2;
- sy = 0;
- } else {
- sy = (image->height - height)/2;
- y = 0;
- h = height;
- }
- if (image->width < width) {
- w = image->width;
- x = (width - w)/2;
- sx = 0;
- } else {
- sx = (image->width - width)/2;
- x = 0;
- w = width;
- }
- RCombineArea(tmp, image, sx, sy, w, h, x, y);
-
- return tmp;
- }
-