int GetStringHeight(char *szString, char* font, int size)
{
int brect[8];
char* err;
gdFontPtr pFont;
if(font && strlen(font) != 0 && size > 0)
{
err = gdImageStringFT(NULL, brect, 0, font,size,0.,0,0,szString);
if (err)
{
/* if error occur, use native font */
return GetStringHeight(szString, "", size);
}
return brect[3]-brect[5];
}
else
{
/* negative size */
switch(size) {
case UF_TINY:
pFont = gdFontGetTiny();
break;
case UF_SMALL:
pFont = gdFontGetSmall();
break;
case UF_MEDIUM:
pFont = gdFontGetMediumBold();
break;
case UF_LARGE:
pFont = gdFontGetLarge();
break;
case UF_GIANT:
pFont = gdFontGetGiant();
break;
default:
pFont = gdFontGetMediumBold();
break;
}
/* positive size */
if(size > 0)
{
if(size > 9)
{
pFont = gdFontGetGiant();
}
else
{
pFont = gdFontGetSmall();
}
}
return pFont->h;
}
}
void Gd::drawString(int x, int y, const char* str, int color, FontStyle style)
{
gdFontPtr font = style == FontTiny ? gdFontGetTiny()
: style == FontSmall ? gdFontGetSmall()
: style == FontMedium ? gdFontGetMediumBold()
: style == FontLarge ? gdFontGetLarge()
: style == FontGiant ? gdFontGetGiant()
: gdFontGetMediumBold();
gdImageString(_imagePtr, font, x, y, const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(str)), color);
}
void Gd::drawChar(int x, int y, char ch, int color, FontStyle style)
{
gdFontPtr font = style == FontTiny ? gdFontGetTiny()
: style == FontSmall ? gdFontGetSmall()
: style == FontMedium ? gdFontGetMediumBold()
: style == FontLarge ? gdFontGetLarge()
: style == FontGiant ? gdFontGetGiant()
: gdFontGetMediumBold();
gdImageChar(_imagePtr, font, x, y, ch, color);
}
static void print_string(gdImagePtr im, int x, int y, const char *str)
{
gdFontPtr font = gdFontGetGiant();
x -= (10 + strlen(str)*font->w);
gdImageFilledRectangle(im, x-1, y,
x+strlen(str)*font->w,
y+font->h, 0x0);
gdImageString(im, font, x, y, (unsigned char *)str, 0x00FFFFFF);
}
/*本函数将code指定的字符写入图片中，将图片大小存储在pic_size中，返回该图片所在的内存地址
写入成功时，返回的内存指针非空
写入失败时，返回的内存指针为空
*/
void * sslvpn_write_string_to_pic(s8 *code, s32 *pic_size)
{
/* Declare color indexes */
s32 black = 0;
s32 white = 0;
s32 randcolor = 0;
s32 i = 0;
/* img pointer */
gdImagePtr im;
/* Font ptr */
gdFontPtr ftptr=gdFontGetGiant();
/*Picture buffer pointer*/
void *pic_buf_ptr;
/* Allocate the image: SSLVPN_VALID_PIC_WIDTH pixels across by SSLVPN_VALID_PIC_HEIGHTS pixels tall */
im = gdImageCreate(SSLVPN_VALID_PIC_WIDTH, SSLVPN_VALID_PIC_HEIGHT);
/* Allocate the color white (red, green and blue all maximum). */
/* Since this is the first color in a new image, it will
* be the background color. */
white = gdImageColorAllocate(im, 255, 255, 255);
/* Allocate the color black (red, green and blue all minimum). */
black = gdImageColorAllocate(im, 0, 0, 0);
/* Draw a centered string. */
gdImageString(im, ftptr,
(im->sx) / 2 - (strlen(code) * (ftptr->w) / 2),
(im->sy) / 2 - ftptr->h / 2, (u8*)code, black);
/* Some disturbing points */
for(i = 0; i < SSLVPN_VALID_DISTURB_POINTS; i++)
{
randcolor = gdImageColorAllocate(im, sslvpn_getRandom(255), sslvpn_getRandom(255), sslvpn_getRandom(255));
gdImageSetPixel(im, sslvpn_getRandom(SSLVPN_VALID_PIC_WIDTH), sslvpn_getRandom(SSLVPN_VALID_PIC_HEIGHT), randcolor);
}
/* Output the image to buf and asign the length of buf to pic_size. */
pic_buf_ptr = gdImagePngPtr(im, pic_size);
/* Destroy the image in memory. */
gdImageDestroy(im);
return pic_buf_ptr;
}
void string(const std::string& text, const Point& point, const Color& color, Size size, int align)
{
// copy text into gd-friendly (unsigned char) buffer
vector<unsigned char> buffer;
copy(text.begin(), text.end(), back_inserter(buffer));
buffer.push_back('\0');
// choose font
gdFontPtr font;
switch (size)
{
case Tiny:
font = gdFontGetTiny();
break;
case Small:
font = gdFontGetSmall();
break;
case MediumBold:
font = gdFontGetMediumBold();
break;
case Large:
font = gdFontGetLarge();
break;
case Giant:
font = gdFontGetGiant();
break;
default:
throw runtime_error("[ImageImpl::string()] This isn't happening.");
}
// calculate position
Point position = point;
int length = (int)text.size() * font->w;
int height = font->h;
if (align & CenterX) position.x -= length/2;
else if (align & Right) position.x -= length;
if (align & CenterY) position.y -= height/2;
else if (align & Bottom) position.y -= height;
// draw the string
gdImageString(im_, font, position.x, position.y, &buffer[0], color2gd(color));
}
gdFontPtr msGetBitmapFont(int size)
{
switch(size) { /* set the font to use */
case MS_TINY:
#ifdef GD_HAS_GETBITMAPFONT
return gdFontGetTiny();
#else
return(gdFontTiny);
#endif
break;
case MS_SMALL:
#ifdef GD_HAS_GETBITMAPFONT
return gdFontGetSmall();
#else
return(gdFontSmall);
#endif
break;
case MS_MEDIUM:
#ifdef GD_HAS_GETBITMAPFONT
return gdFontGetMediumBold();
#else
return(gdFontMediumBold);
#endif
break;
case MS_LARGE:
#ifdef GD_HAS_GETBITMAPFONT
return gdFontGetLarge();
#else
return(gdFontLarge);
#endif
break;
case MS_GIANT:
#ifdef GD_HAS_GETBITMAPFONT
return gdFontGetGiant();
#else
return(gdFontGiant);
#endif
break;
default:
msSetError(MS_GDERR,"Invalid bitmap font. Must be one of tiny, small, medium, large or giant." , "msGetBitmapFont()");
return(NULL);
}
}
gdFontPtr msGetBitmapFont(int size)
{
switch(size) { /* set the font to use */
case MS_TINY:
return gdFontGetTiny();
break;
case MS_SMALL:
return gdFontGetSmall();
break;
case MS_MEDIUM:
return gdFontGetMediumBold();
break;
case MS_LARGE:
return gdFontGetLarge();
break;
case MS_GIANT:
return gdFontGetGiant();
break;
default:
msSetError(MS_GDERR,"Invalid bitmap font. Must be one of tiny, small, medium, large or giant." , "msGetBitmapFont()");
return(NULL);
}
}
void gdDrawImage(HDC hdc, RECT *rc)
{
HDC mem_dc;
BITMAPINFO bmp_info;
void* bits;
HBITMAP bmp, temp;
gdImagePtr im;
int width, height, stride;
int white, black, blue, red;
char *s = "Hello world!";
gdFontPtr lfont, gfont;
width = rc->right - rc->left;
height = rc->bottom - rc->top;
bmp_info = gdCreateBmp(width, height);
// Create memory device context
mem_dc = CreateCompatibleDC(hdc);
if (!mem_dc) {
MessageBox(NULL, "Can't create a compatible DC!", "Error!", MB_ICONEXCLAMATION | MB_OK);
return;
}
// bits points to a shared buffer of pixels
bits = NULL;
bmp = CreateDIBSection(mem_dc, &bmp_info, DIB_RGB_COLORS, (void**)&bits, 0, 0);
// Selecting the object before doing anything allows you to use libgd
// together with native Windows GDI.
temp = (HBITMAP)SelectObject(mem_dc, bmp);
/*stride = ((width * 1 + 3) >> 2) << 2;*/
// always uses 32bit in BMPINFO
stride = width;
im = NULL;
// Attach shared buffer of pixels to GD image
// Negative stride places 0,0 in upper-left corner
im = gdImageTrueColorAttachBuffer((int*)bits, width, height, -stride);
if (!im) {
MessageBox(NULL, "GD image creation failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
return;
}
// Start of GD drawing
white = gdImageColorAllocate(im, 255, 255, 255);
black = gdImageColorAllocate(im, 0, 0, 0);
blue = gdImageColorAllocate(im, 0, 0, 255);
// Allocate the color red, 50% transparent.
red = gdImageColorAllocateAlpha(im, 255, 0, 0, 64);
// Erase background with white color
gdImageFilledRectangle(im, 0, 0, width, height, 0xFF0000);
lfont = gdFontGetLarge();
gfont = gdFontGetGiant();
// Draw a dashed line from the upper left corner to the lower right corner.
gdImageFilledRectangle(im, 25, 25, 100, 100, blue);
gdImageChar(im, gfont, 35, 35, 'Q', white);
gdImageFilledRectangle(im, 50, 50, 75, 175, red);
gdImageLine(im, 0, 0, 150, 150, black);
gdImageString(im, gdFontGetLarge(),
im->sx / 2 - (strlen(s) * lfont->w / 2),
im->sy / 2 - lfont->h / 2,
(unsigned char*)s, black);
// Copy drawing from memory context (shared bitmap buffer) to screen DC.
BitBlt(hdc, rc->left, rc->top, width, height, mem_dc, 0, 0, SRCCOPY);
// Free
gdImageDetachBuffer(im);
SelectObject(mem_dc, temp);
DeleteObject(bmp);
DeleteObject(mem_dc);
}
int
main (void)
{
#ifdef HAVE_LIBPNG
/* Input and output files */
FILE *in;
FILE *out;
/* Input and output images */
gdImagePtr im_in = 0, im_out = 0;
/* Brush image */
gdImagePtr brush;
/* Color indexes */
int white;
int blue;
int red;
int green;
/* Points for polygon */
gdPoint points[3];
int i;
/* gd fonts for font test */
gdFontPtr fonts[5];
int y;
/* Create output image, in true color. */
im_out = gdImageCreateTrueColor (256 + 384, 384);
/* 2.0.2: first color allocated would automatically be background in a
palette based image. Since this is a truecolor image, with an
automatic background of black, we must fill it explicitly. */
white = gdImageColorAllocate (im_out, 255, 255, 255);
gdImageFilledRectangle (im_out, 0, 0, gdImageSX (im_out),
gdImageSY (im_out), white);
/* Set transparent color. */
gdImageColorTransparent (im_out, white);
/* Try to load demoin.png and paste part of it into the
output image. */
in = fopen ("demoin.png", "rb");
if (!in)
{
fprintf (stderr, "Can't load source image; this demo\n");
fprintf (stderr, "is much more impressive if demoin.png\n");
fprintf (stderr, "is available.\n");
im_in = 0;
}
else
{
int a;
im_in = gdImageCreateFromPng (in);
fclose (in);
/* Now copy, and magnify as we do so */
gdImageCopyResampled (im_out, im_in, 32, 32, 0, 0, 192, 192, 255, 255);
/* Now display variously rotated space shuttles in a circle of our own */
for (a = 0; (a < 360); a += 45)
{
int cx = cos (a * .0174532925) * 128;
int cy = -sin (a * .0174532925) * 128;
gdImageCopyRotated (im_out, im_in,
256 + 192 + cx, 192 + cy,
0, 0, gdImageSX (im_in), gdImageSY (im_in), a);
}
}
red = gdImageColorAllocate (im_out, 255, 0, 0);
green = gdImageColorAllocate (im_out, 0, 255, 0);
blue = gdImageColorAllocate (im_out, 0, 0, 255);
/* Fat Rectangle */
gdImageSetThickness (im_out, 4);
gdImageLine (im_out, 16, 16, 240, 16, green);
gdImageLine (im_out, 240, 16, 240, 240, green);
gdImageLine (im_out, 240, 240, 16, 240, green);
gdImageLine (im_out, 16, 240, 16, 16, green);
gdImageSetThickness (im_out, 1);
/* Circle */
gdImageArc (im_out, 128, 128, 60, 20, 0, 720, blue);
/* Arc */
gdImageArc (im_out, 128, 128, 40, 40, 90, 270, blue);
/* Flood fill: doesn't do much on a continuously
variable tone jpeg original. */
gdImageFill (im_out, 8, 8, blue);
/* Polygon */
points[0].x = 64;
points[0].y = 0;
points[1].x = 0;
points[1].y = 128;
points[2].x = 128;
points[2].y = 128;
gdImageFilledPolygon (im_out, points, 3, green);
/* 2.0.12: Antialiased Polygon */
gdImageSetAntiAliased (im_out, green);
for (i = 0; (i < 3); i++)
{
points[i].x += 128;
}
gdImageFilledPolygon (im_out, points, 3, gdAntiAliased);
/* Brush. A fairly wild example also involving a line style! */
if (im_in)
{
int style[8];
brush = gdImageCreateTrueColor (16, 16);
gdImageCopyResized (brush, im_in,
0, 0, 0, 0,
gdImageSX (brush), gdImageSY (brush),
gdImageSX (im_in), gdImageSY (im_in));
gdImageSetBrush (im_out, brush);
/* With a style, so they won't overprint each other.
Normally, they would, yielding a fat-brush effect. */
style[0] = 0;
style[1] = 0;
style[2] = 0;
style[3] = 0;
style[4] = 0;
style[5] = 0;
style[6] = 0;
style[7] = 1;
gdImageSetStyle (im_out, style, 8);
/* Draw the styled, brushed line */
gdImageLine (im_out, 0, 255, 255, 0, gdStyledBrushed);
}
/* Text (non-truetype; see gdtestft for a freetype demo) */
fonts[0] = gdFontGetTiny ();
fonts[1] = gdFontGetSmall ();
fonts[2] = gdFontGetMediumBold ();
fonts[3] = gdFontGetLarge ();
fonts[4] = gdFontGetGiant ();
y = 0;
for (i = 0; (i <= 4); i++)
{
gdImageString (im_out, fonts[i], 32, 32 + y, (unsigned char *) "hi",
red);
y += fonts[i]->h;
}
y = 0;
for (i = 0; (i <= 4); i++)
{
gdImageStringUp (im_out, fonts[i], 64 + y, 64,
(unsigned char *) "hi", red);
y += fonts[i]->h;
}
/* Random antialiased lines; coordinates all over the image,
but the output will respect a small clipping rectangle */
gdImageSetClip (im_out, 0, gdImageSY (im_out) - 100,
100, gdImageSY (im_out));
/* Fixed seed for reproducibility of results */
srand (100);
for (i = 0; (i < 100); i++)
{
int x1 = rand () % gdImageSX (im_out);
int y1 = rand () % gdImageSY (im_out);
int x2 = rand () % gdImageSX (im_out);
int y2 = rand () % gdImageSY (im_out);
gdImageSetAntiAliased (im_out, white);
gdImageLine (im_out, x1, y1, x2, y2, gdAntiAliased);
}
/* Make output image interlaced (progressive, in the case of JPEG) */
gdImageInterlace (im_out, 1);
out = fopen ("demoout.png", "wb");
/* Write PNG */
gdImagePng (im_out, out);
fclose (out);
out = fopen ("demoout.gif", "wb");
/* Write GIF (2.0.28) */
gdImageGif (im_out, out);
fclose (out);
/* 2.0.12: also write a paletteized png comparable to the gif */
out = fopen ("demooutp.png", "wb");
gdImageTrueColorToPalette (im_out, 0, 256);
gdImagePng (im_out, out);
fclose (out);
gdImageDestroy (im_out);
if (im_in)
{
gdImageDestroy (im_in);
}
#else
fprintf (stderr, "No PNG library support.\n");
#endif /* HAVE_LIBPNG */
return 0;
}
int DrawString(gdImagePtr image, char *szString, int x, int y, char* font, int size, int color, TEXT_ALIGN align)
{
int brect[8];
gdFontPtr pFont;
char* err;
int offsetX = 0, offsetY = 0;
if(image)
{
/* use TTF */
if(font && strlen(font) != 0 && size > 0)
{
err = gdImageStringFT(NULL, brect, 0, font,size,0.,0,0,szString);
if (err)
{
/* if error occur, use native font */
return DrawString(image, szString, x, y, "", size, color, align);
}
switch(align) {
case TA_CENTERED:
offsetX = -(brect[2]-brect[0])/2;
offsetY = +(brect[3]-brect[5])/2;
break;
case TA_TOPLEFT:
offsetX = 0;
offsetY = (brect[3]-brect[5]);
break;
case TA_RIGHTBOTTOM:
offsetX = -(brect[2]-brect[0]);
offsetY = 0;
break;
}
err = gdImageStringFT( image,brect,
color,font, size, 0.,
x+offsetX,
y+offsetY,
szString);
if (err)
{
/* if error occur, use native font */
return DrawString(image, szString, x, y, "", size, color, align);
}
}
/* use native GD fonts */
else
{
/* negative size */
switch(size) {
case UF_TINY:
pFont = gdFontGetTiny();
break;
case UF_SMALL:
pFont = gdFontGetSmall();
break;
case UF_MEDIUM:
pFont = gdFontGetMediumBold();
break;
case UF_LARGE:
pFont = gdFontGetLarge();
break;
case UF_GIANT:
pFont = gdFontGetGiant();
break;
default:
pFont = gdFontGetMediumBold();
break;
}
/* positive size */
if(size > 0)
{
if(size > 9)
{
pFont = gdFontGetGiant();
}
else
{
pFont = gdFontGetSmall();
}
}
switch(align) {
case TA_CENTERED:
offsetX = -(int)(strlen(szString) * pFont->w)/2;
offsetY = (int)-pFont->h/2;
break;
case TA_TOPLEFT:
offsetX = offsetY = 0;
break;
case TA_RIGHTBOTTOM:
offsetX = -(int)(strlen(szString) * pFont->w);
offsetY = -pFont->h;
break;
}
gdImageString( image, pFont,
x+offsetX,
y+offsetY,
(unsigned char*)szString, color);
}
return OK;
}
return FAILURE;
}
