/fltk/src/Fl_Image.cxx
C++ | 559 lines | 360 code | 81 blank | 118 comment | 106 complexity | 92232ec17312e3777428af1243d0d3f6 MD5 | raw file
Possible License(s): LGPL-2.0, LGPL-3.0, 0BSD
- //
- // "$Id: Fl_Image.cxx 7522 2010-04-18 06:57:37Z manolo $"
- //
- // Image drawing code for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-2009 by Bill Spitzak and others.
- //
- // 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- // USA.
- //
- // Please report all bugs and problems on the following page:
- //
- // http://www.fltk.org/str.php
- //
-
- #include <FL/Fl.H>
- #include <FL/fl_draw.H>
- #include <FL/x.H>
- #include <FL/Fl_Widget.H>
- #include <FL/Fl_Menu_Item.H>
- #include <FL/Fl_Image.H>
- #include "flstring.h"
-
- #ifdef WIN32
- void fl_release_dc(HWND, HDC); // from Fl_win32.cxx
- #endif
-
- void fl_restore_clip(); // from fl_rect.cxx
-
- //
- // Base image class...
- //
-
- /**
- The destructor is a virtual method that frees all memory used
- by the image.
- */
- Fl_Image::~Fl_Image() {
- }
-
- /**
- If the image has been cached for display, delete the cache
- data. This allows you to change the data used for the image and
- then redraw it without recreating an image object.
- */
- void Fl_Image::uncache() {
- }
-
- void Fl_Image::draw(int XP, int YP, int, int, int, int) {
- draw_empty(XP, YP);
- }
-
- /**
- The protected method draw_empty() draws a box with
- an X in it. It can be used to draw any image that lacks image
- data.
- */
- void Fl_Image::draw_empty(int X, int Y) {
- if (w() > 0 && h() > 0) {
- fl_color(FL_FOREGROUND_COLOR);
- fl_rect(X, Y, w(), h());
- fl_line(X, Y, X + w() - 1, Y + h() - 1);
- fl_line(X, Y + h() - 1, X + w() - 1, Y);
- }
- }
-
- /**
- The copy() method creates a copy of the specified
- image. If the width and height are provided, the image is
- resized to the specified size. The image should be deleted (or in
- the case of Fl_Shared_Image, released) when you are done
- with it.
- */
- Fl_Image *Fl_Image::copy(int W, int H) {
- return new Fl_Image(W, H, d());
- }
-
- /**
- The color_average() method averages the colors in
- the image with the FLTK color value c. The i
- argument specifies the amount of the original image to combine
- with the color, so a value of 1.0 results in no color blend, and
- a value of 0.0 results in a constant image of the specified
- color. <I>The original image data is not altered by this
- method.</I>
- */
- void Fl_Image::color_average(Fl_Color, float) {
- }
-
- /**
- The desaturate() method converts an image to
- grayscale. If the image contains an alpha channel (depth = 4),
- the alpha channel is preserved. <I>This method does not alter
- the original image data.</I>
- */
- void Fl_Image::desaturate() {
- }
-
- /**
- The label() methods are an obsolete way to set the
- image attribute of a widget or menu item. Use the
- image() or deimage() methods of the
- Fl_Widget and Fl_Menu_Item classes
- instead.
- */
- void Fl_Image::label(Fl_Widget* widget) {
- widget->image(this);
- }
-
- /**
- The label() methods are an obsolete way to set the
- image attribute of a widget or menu item. Use the
- image() or deimage() methods of the
- Fl_Widget and Fl_Menu_Item classes
- instead.
- */
- void Fl_Image::label(Fl_Menu_Item* m) {
- Fl::set_labeltype(_FL_IMAGE_LABEL, labeltype, measure);
- m->label(_FL_IMAGE_LABEL, (const char*)this);
- }
-
- void
- Fl_Image::labeltype(const Fl_Label *lo, // I - Label
- int lx, // I - X position
- int ly, // I - Y position
- int lw, // I - Width of label
- int lh, // I - Height of label
- Fl_Align la) { // I - Alignment
- Fl_Image *img; // Image pointer
- int cx, cy; // Image position
-
- img = (Fl_Image *)(lo->value);
-
- if (la & FL_ALIGN_LEFT) cx = 0;
- else if (la & FL_ALIGN_RIGHT) cx = img->w() - lw;
- else cx = (img->w() - lw) / 2;
-
- if (la & FL_ALIGN_TOP) cy = 0;
- else if (la & FL_ALIGN_BOTTOM) cy = img->h() - lh;
- else cy = (img->h() - lh) / 2;
-
- fl_color((Fl_Color)lo->color);
-
- img->draw(lx, ly, lw, lh, cx, cy);
- }
-
- void
- Fl_Image::measure(const Fl_Label *lo, // I - Label
- int &lw, // O - Width of image
- int &lh) { // O - Height of image
- Fl_Image *img; // Image pointer
-
- img = (Fl_Image *)(lo->value);
-
- lw = img->w();
- lh = img->h();
- }
-
-
- //
- // RGB image class...
- //
- /** The destructor free all memory and server resources that are used by the image. */
- Fl_RGB_Image::~Fl_RGB_Image() {
- uncache();
- if (alloc_array) delete[] (uchar *)array;
- }
-
- void Fl_RGB_Image::uncache() {
- #ifdef __APPLE_QUARTZ__
- if (id_) {
- CGImageRelease((CGImageRef)id_);
- id_ = 0;
- }
- #else
- if (id_) {
- fl_delete_offscreen((Fl_Offscreen)id_);
- id_ = 0;
- }
-
- if (mask_) {
- fl_delete_bitmask((Fl_Bitmask)mask_);
- mask_ = 0;
- }
- #endif
- }
-
- Fl_Image *Fl_RGB_Image::copy(int W, int H) {
- Fl_RGB_Image *new_image; // New RGB image
- uchar *new_array; // New array for image data
-
- // Optimize the simple copy where the width and height are the same,
- // or when we are copying an empty image...
- if ((W == w() && H == h()) ||
- !w() || !h() || !d() || !array) {
- if (array) {
- // Make a copy of the image data and return a new Fl_RGB_Image...
- new_array = new uchar[w() * h() * d()];
- if (ld() && ld()!=w()*d()) {
- const uchar *src = array;
- uchar *dst = new_array;
- int dy, dh = h(), wd = w()*d(), wld = ld();
- for (dy=0; dy<dh; dy++) {
- memcpy(dst, src, wd);
- src += wld;
- dst += wd;
- }
- } else {
- memcpy(new_array, array, w() * h() * d());
- }
- new_image = new Fl_RGB_Image(new_array, w(), h(), d());
- new_image->alloc_array = 1;
-
- return new_image;
- } else return new Fl_RGB_Image(array, w(), h(), d(), ld());
- }
- if (W <= 0 || H <= 0) return 0;
-
- // OK, need to resize the image data; allocate memory and
- uchar *new_ptr; // Pointer into new array
- const uchar *old_ptr; // Pointer into old array
- int c, // Channel number
- sy, // Source coordinate
- dx, dy, // Destination coordinates
- xerr, yerr, // X & Y errors
- xmod, ymod, // X & Y moduli
- xstep, ystep, // X & Y step increments
- line_d; // stride from line to line
-
-
- // Figure out Bresenheim step/modulus values...
- xmod = w() % W;
- xstep = (w() / W) * d();
- ymod = h() % H;
- ystep = h() / H;
- line_d = ld() ? ld() : w() * d();
-
- // Allocate memory for the new image...
- new_array = new uchar [W * H * d()];
- new_image = new Fl_RGB_Image(new_array, W, H, d());
- new_image->alloc_array = 1;
-
- // Scale the image using a nearest-neighbor algorithm...
- for (dy = H, sy = 0, yerr = H, new_ptr = new_array; dy > 0; dy --) {
- for (dx = W, xerr = W, old_ptr = array + sy * line_d; dx > 0; dx --) {
- for (c = 0; c < d(); c ++) *new_ptr++ = old_ptr[c];
-
- old_ptr += xstep;
- xerr -= xmod;
-
- if (xerr <= 0) {
- xerr += W;
- old_ptr += d();
- }
- }
-
- sy += ystep;
- yerr -= ymod;
- if (yerr <= 0) {
- yerr += H;
- sy ++;
- }
- }
-
- return new_image;
- }
-
- void Fl_RGB_Image::color_average(Fl_Color c, float i) {
- // Don't average an empty image...
- if (!w() || !h() || !d() || !array) return;
-
- // Delete any existing pixmap/mask objects...
- uncache();
-
- // Allocate memory as needed...
- uchar *new_array,
- *new_ptr;
-
- if (!alloc_array) new_array = new uchar[h() * w() * d()];
- else new_array = (uchar *)array;
-
- // Get the color to blend with...
- uchar r, g, b;
- unsigned ia, ir, ig, ib;
-
- Fl::get_color(c, r, g, b);
- if (i < 0.0f) i = 0.0f;
- else if (i > 1.0f) i = 1.0f;
-
- ia = (unsigned)(256 * i);
- ir = r * (256 - ia);
- ig = g * (256 - ia);
- ib = b * (256 - ia);
-
- // Update the image data to do the blend...
- const uchar *old_ptr;
- int x, y;
- int line_i = ld() ? ld() - (w()*d()) : 0; // increment from line end to beginning of next line
-
- if (d() < 3) {
- ig = (r * 31 + g * 61 + b * 8) / 100 * (256 - ia);
-
- for (new_ptr = new_array, old_ptr = array, y = 0; y < h(); y ++, old_ptr += line_i)
- for (x = 0; x < w(); x ++) {
- *new_ptr++ = (*old_ptr++ * ia + ig) >> 8;
- if (d() > 1) *new_ptr++ = *old_ptr++;
- }
- } else {
- for (new_ptr = new_array, old_ptr = array, y = 0; y < h(); y ++, old_ptr += line_i)
- for (x = 0; x < w(); x ++) {
- *new_ptr++ = (*old_ptr++ * ia + ir) >> 8;
- *new_ptr++ = (*old_ptr++ * ia + ig) >> 8;
- *new_ptr++ = (*old_ptr++ * ia + ib) >> 8;
- if (d() > 3) *new_ptr++ = *old_ptr++;
- }
- }
-
- // Set the new pointers/values as needed...
- if (!alloc_array) {
- array = new_array;
- alloc_array = 1;
-
- ld(0);
- }
- }
-
- void Fl_RGB_Image::desaturate() {
- // Don't desaturate an empty image...
- if (!w() || !h() || !d() || !array) return;
-
- // Can only desaturate color images...
- if (d() < 3) return;
-
- // Delete any existing pixmap/mask objects...
- uncache();
-
- // Allocate memory for a grayscale image...
- uchar *new_array,
- *new_ptr;
- int new_d;
-
- new_d = d() - 2;
- new_array = new uchar[h() * w() * new_d];
-
- // Copy the image data, converting to grayscale...
- const uchar *old_ptr;
- int x, y;
- int line_i = ld() ? ld() - (w()*d()) : 0; // increment from line end to beginning of next line
-
- for (new_ptr = new_array, old_ptr = array, y = 0; y < h(); y ++, old_ptr += line_i)
- for (x = 0; x < w(); x ++, old_ptr += d()) {
- *new_ptr++ = (uchar)((31 * old_ptr[0] + 61 * old_ptr[1] + 8 * old_ptr[2]) / 100);
- if (d() > 3) *new_ptr++ = old_ptr[3];
- }
-
- // Free the old array as needed, and then set the new pointers/values...
- if (alloc_array) delete[] (uchar *)array;
-
- array = new_array;
- alloc_array = 1;
-
- ld(0);
- d(new_d);
- }
-
- #if !defined(WIN32) && !defined(__APPLE_QUARTZ__)
- // Composite an image with alpha on systems that don't have accelerated
- // alpha compositing...
- static void alpha_blend(Fl_RGB_Image *img, int X, int Y, int W, int H, int cx, int cy) {
- uchar *srcptr = (uchar*)img->array + img->d() * (img->w() * cy + cx);
- int srcskip = img->d() * (img->w() - W);
-
- uchar *dst = new uchar[W * H * 3];
- uchar *dstptr = dst;
-
- fl_read_image(dst, X, Y, W, H, 0);
-
- uchar srcr, srcg, srcb, srca;
- uchar dstr, dstg, dstb, dsta;
-
- if (img->d() == 2) {
- // Composite grayscale + alpha over RGB...
- // Composite RGBA over RGB...
- for (int y = H; y > 0; y--, srcptr+=srcskip)
- for (int x = W; x > 0; x--) {
- srcg = *srcptr++;
- srca = *srcptr++;
-
- dstr = dstptr[0];
- dstg = dstptr[1];
- dstb = dstptr[2];
- dsta = 255 - srca;
-
- *dstptr++ = (srcg * srca + dstr * dsta) >> 8;
- *dstptr++ = (srcg * srca + dstg * dsta) >> 8;
- *dstptr++ = (srcg * srca + dstb * dsta) >> 8;
- }
- } else {
- // Composite RGBA over RGB...
- for (int y = H; y > 0; y--, srcptr+=srcskip)
- for (int x = W; x > 0; x--) {
- srcr = *srcptr++;
- srcg = *srcptr++;
- srcb = *srcptr++;
- srca = *srcptr++;
-
- dstr = dstptr[0];
- dstg = dstptr[1];
- dstb = dstptr[2];
- dsta = 255 - srca;
-
- *dstptr++ = (srcr * srca + dstr * dsta) >> 8;
- *dstptr++ = (srcg * srca + dstg * dsta) >> 8;
- *dstptr++ = (srcb * srca + dstb * dsta) >> 8;
- }
- }
-
- fl_draw_image(dst, X, Y, W, H, 3, 0);
-
- delete[] dst;
- }
- #endif // !WIN32 && !__APPLE_QUARTZ__
-
- void Fl_RGB_Image::draw(int XP, int YP, int WP, int HP, int cx, int cy) {
- fl_device->draw(this, XP, YP, WP, HP, cx, cy);
- }
-
- void Fl_RGB_Image::generic_device_draw(int XP, int YP, int WP, int HP, int cx, int cy) {
- // Don't draw an empty image...
- if (!d() || !array) {
- draw_empty(XP, YP);
- return;
- }
-
- // account for current clip region (faster on Irix):
- int X,Y,W,H; fl_clip_box(XP,YP,WP,HP,X,Y,W,H);
- cx += X-XP; cy += Y-YP;
- // clip the box down to the size of image, quit if empty:
- if (cx < 0) {W += cx; X -= cx; cx = 0;}
- if (cx+W > w()) W = w()-cx;
- if (W <= 0) return;
- if (cy < 0) {H += cy; Y -= cy; cy = 0;}
- if (cy+H > h()) H = h()-cy;
- if (H <= 0) return;
- if (!id_) {
- #ifdef __APPLE_QUARTZ__
- CGColorSpaceRef lut = 0;
- if (d()<=2)
- lut = CGColorSpaceCreateDeviceGray();
- else
- lut = CGColorSpaceCreateDeviceRGB();
- CGDataProviderRef src = CGDataProviderCreateWithData( 0L, array, w()*h()*d(), 0L);
- id_ = CGImageCreate( w(), h(), 8, d()*8, ld()?ld():w()*d(),
- lut, (d()&1)?kCGImageAlphaNone:kCGImageAlphaLast,
- src, 0L, false, kCGRenderingIntentDefault);
- CGColorSpaceRelease(lut);
- CGDataProviderRelease(src);
- #elif defined(WIN32)
- id_ = fl_create_offscreen(w(), h());
- if ((d() == 2 || d() == 4) && fl_can_do_alpha_blending()) {
- fl_begin_offscreen((Fl_Offscreen)id_);
- fl_draw_image(array, 0, 0, w(), h(), d()|FL_IMAGE_WITH_ALPHA, ld());
- fl_end_offscreen();
- } else {
- fl_begin_offscreen((Fl_Offscreen)id_);
- fl_draw_image(array, 0, 0, w(), h(), d(), ld());
- fl_end_offscreen();
- if (d() == 2 || d() == 4) {
- mask_ = fl_create_alphamask(w(), h(), d(), ld(), array);
- }
- }
- #else
- if (d() == 1 || d() == 3) {
- id_ = fl_create_offscreen(w(), h());
- fl_begin_offscreen((Fl_Offscreen)id_);
- fl_draw_image(array, 0, 0, w(), h(), d(), ld());
- fl_end_offscreen();
- }
- #endif
- }
-
- #if defined(USE_X11)
- if (id_) {
- if (mask_) {
- // I can't figure out how to combine a mask with existing region,
- // so cut the image down to a clipped rectangle:
- int nx, ny; fl_clip_box(X,Y,W,H,nx,ny,W,H);
- cx += nx-X; X = nx;
- cy += ny-Y; Y = ny;
- // make X use the bitmap as a mask:
- XSetClipMask(fl_display, fl_gc, mask_);
- int ox = X-cx; if (ox < 0) ox += w();
- int oy = Y-cy; if (oy < 0) oy += h();
- XSetClipOrigin(fl_display, fl_gc, X-cx, Y-cy);
- }
-
- fl_copy_offscreen(X, Y, W, H, id_, cx, cy);
-
- if (mask_) {
- // put the old clip region back
- XSetClipOrigin(fl_display, fl_gc, 0, 0);
- fl_restore_clip();
- }
- } else {
- // Composite image with alpha manually each time...
- alpha_blend(this, X, Y, W, H, cx, cy);
- }
- #elif defined(WIN32)
- if (mask_) {
- HDC new_gc = CreateCompatibleDC(fl_gc);
- int save = SaveDC(new_gc);
- SelectObject(new_gc, (void*)mask_);
- BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCAND);
- SelectObject(new_gc, (void*)id_);
- BitBlt(fl_gc, X, Y, W, H, new_gc, cx, cy, SRCPAINT);
- RestoreDC(new_gc,save);
- DeleteDC(new_gc);
- } else if (d()==2 || d()==4) {
- fl_copy_offscreen_with_alpha(X, Y, W, H, (Fl_Offscreen)id_, cx, cy);
- } else {
- fl_copy_offscreen(X, Y, W, H, (Fl_Offscreen)id_, cx, cy);
- }
- #elif defined(__APPLE_QUARTZ__)
- if (id_ && fl_gc) {
- CGRect rect = { { X, Y }, { W, H } };
- Fl_X::q_begin_image(rect, cx, cy, w(), h());
- CGContextDrawImage(fl_gc, rect, (CGImageRef)id_);
- Fl_X::q_end_image();
- }
- #else
- # error unsupported platform
- #endif
- }
-
- void Fl_RGB_Image::label(Fl_Widget* widget) {
- widget->image(this);
- }
-
- void Fl_RGB_Image::label(Fl_Menu_Item* m) {
- Fl::set_labeltype(_FL_IMAGE_LABEL, labeltype, measure);
- m->label(_FL_IMAGE_LABEL, (const char*)this);
- }
-
-
- //
- // End of "$Id: Fl_Image.cxx 7522 2010-04-18 06:57:37Z manolo $".
- //