如何用SetPixel直接在位图上写字？不用TextOut

hamham 2003-10-18 04:30:43
请指教
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bluebohe 2003-10-21
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多谢SeekInRain支持！
hamham 2003-10-21
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头文件片断

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hamham 2003-10-21
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片断

gdImagePtr gdImageCreate(int sx, int sy)
{
int i;
gdImagePtr im;
im = (gdImage *) malloc(sizeof(gdImage));
im->pixels = (unsigned char **) malloc(sizeof(unsigned char *) * sx);
im->polyInts = 0;
im->polyAllocated = 0;
im->brush = 0;
im->tile = 0;
im->style = 0;
for (i=0; (i<sx); i++) {
im->pixels[i] = (unsigned char *) calloc(
sy, sizeof(unsigned char));
}
im->sx = sx;
im->sy = sy;
im->colorsTotal = 0;
im->transparent = (-1);
im->interlace = 0;
return im;
}

void gdImageDestroy(gdImagePtr im)
{
int i;
for (i=0; (i<im->sx); i++) {
free(im->pixels[i]);
}
free(im->pixels);
if (im->polyInts) {
free(im->polyInts);
}
if (im->style) {
free(im->style);
}
free(im);
}

int gdImageColorClosest(gdImagePtr im, int r, int g, int b)
{
int i;
long rd, gd, bd;
int ct = (-1);
long mindist = 0;
for (i=0; (i<(im->colorsTotal)); i++) {
long dist;
if (im->open[i]) {
continue;
}
rd = (im->red[i] - r);
gd = (im->green[i] - g);
bd = (im->blue[i] - b);
dist = rd * rd + gd * gd + bd * bd;
if ((i == 0) || (dist < mindist)) {
mindist = dist;
ct = i;
}
}
return ct;
}

int gdImageColorExact(gdImagePtr im, int r, int g, int b)
{
int i;
for (i=0; (i<(im->colorsTotal)); i++) {
if (im->open[i]) {
continue;
}
if ((im->red[i] == r) &&
(im->green[i] == g) &&
(im->blue[i] == b)) {
return i;
}
}
return -1;
}

int gdImageColorAllocate(gdImagePtr im, int r, int g, int b)
{
int i;
int ct = (-1);
for (i=0; (i<(im->colorsTotal)); i++) {
if (im->open[i]) {
ct = i;
break;
}
}
if (ct == (-1)) {
ct = im->colorsTotal;
if (ct == gdMaxColors) {
return -1;
}
im->colorsTotal++;
}
im->red[ct] = r;
im->green[ct] = g;
im->blue[ct] = b;
im->open[ct] = 0;
return ct;
}

void gdImageColorDeallocate(gdImagePtr im, int color)
{
/* Mark it open. */
im->open[color] = 1;
}

void gdImageColorTransparent(gdImagePtr im, int color)
{
im->transparent = color;
}

void gdImageSetPixel(gdImagePtr im, int x, int y, int color)
{
int p;
switch(color) {
case gdStyled:
if (!im->style) {
/* Refuse to draw if no style is set. */
return;
} else {
p = im->style[im->stylePos++];
}
if (p != (gdTransparent)) {
gdImageSetPixel(im, x, y, p);
}
im->stylePos = im->stylePos % im->styleLength;
break;
case gdStyledBrushed:
if (!im->style) {
/* Refuse to draw if no style is set. */
return;
}
p = im->style[im->stylePos++];
if ((p != gdTransparent) && (p != 0)) {
gdImageSetPixel(im, x, y, gdBrushed);
}
im->stylePos = im->stylePos % im->styleLength;
break;
case gdBrushed:
gdImageBrushApply(im, x, y);
break;
case gdTiled:
gdImageTileApply(im, x, y);
break;
default:
if (gdImageBoundsSafe(im, x, y)) {
im->pixels[x][y] = color;
}
break;
}
}
bluebohe 2003-10-20
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bluebohe@163.com
请给我一份,证明没有倒分
lzwcom 2003-10-19
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lzwqj2000@vip.sina.com
yaoha2003 2003-10-19
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能不能给我一份，谢谢啦
yaoha2002@163.com
hahu 2003-10-19
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ohahu@163.com
我想哦,SeekInRain(Arthur)能不能给我发一份
SeekInRain 2003-10-19
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我有原码
3jaja 2003-10-18
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是否曾经想过比SetPixel更快的东西？ 好吧，您已经找到了。
Andrew Heinlein鼠标简单动画使用setpixel-api__1-12056
使用SetPixel API的简单动画 描述 这段代码将通过绘制一个3d正方形来显示SetPixel API的用法，该正方形会在鼠标位于设置像素的图片框上方时跟随鼠标。 更多信息 提交时间 2000-10-14 15:52:46 经过 等级 初学者 用户评分 4.3（4个用户的17个地球仪） 兼容性 VB 4.0（32位），VB 5.0，VB 6.0 类别 世界 存档文件
为什么GetPixel和SetPixel的使用效率如此低下！
几秒钟即可处理一张百万像素的图片……到底是什么？
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