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Add size limits and aspect ratio functions

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Fixes #555.
This commit is contained in:
Camilla Berglund 2014-02-13 02:57:59 +01:00
parent 8e062afdd8
commit d84772d620
13 changed files with 399 additions and 13 deletions
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2
README.md
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@ -61,6 +61,8 @@ GLFW bundles a number of dependencies in the `deps/` directory.
## Changelog
- Added `glfwSetWindowSizeLimits` and `glfwSetWindowAspectRatio` for setting
absolute and relative window size limits
- Added `GLFW_TRUE` and `GLFW_FALSE` as client API independent boolean values
- Removed dependency on external OpenGL or OpenGL ES headers
- [WGL] Removed dependency on external WGL headers

5
docs/news.dox
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@ -4,6 +4,11 @@
@section news_32 New features in 3.2
@subsection news_32_sizelimits Window size limit support
GLFW now supports setting both absolute and relative window size limits with
@ref glfwSetWindowSizeLimits and @ref glfwSetWindowAspectRatio.
@section news_31 New features in 3.1

39
docs/window.dox
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@ -485,6 +485,45 @@ The size of a framebuffer may change independently of the size of a window, for
example if the window is dragged between a regular monitor and a high-DPI one.
@subsection window_sizelimits Window size limits
The minimum and maximum size of the client area of a windowed mode window can be
set with @ref glfwSetWindowSizeLimits. The user may resize the window to any
size and aspect ratio within the specified limits, unless the aspect ratio is
also set.
@code
glfwSetWindowSizeLimits(window, 200, 200, 400, 400);
@endcode
To disable size limits for a window, set them to `GLFW_DONT_CARE`.
@code
glfwSetWindowSizeLimits(window, GLFW_DONT_CARE, GLFW_DONT_CARE, GLFW_DONT_CARE, GLFW_DONT_CARE);
@endcode
The aspect ratio of the client area of a windowed mode window can be set with
@ref glfwSetWindowAspectRatio. The user may resize the window freely unless
size limits are also set, but the size will be constrained to maintain the
aspect ratio.
The aspect ratio is specified as a numerator and denominator, corresponding to
the width and height, respectively.
@code
glfwSetWindowAspectRatio(window, 16, 9);
@endcode
To disable aspect ratio for a window, set it to `GLFW_DONT_CARE`.
@code
glfwSetWindowAspectRatio(window, GLFW_DONT_CARE, GLFW_DONT_CARE);
@endcode
You can have both size limits and aspect ratio set for a window, but the results
are undefined if they conflict.
@subsection window_pos Window position
The position of a windowed-mode window can be changed with @ref

2
examples/boing.c
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@ -611,6 +611,8 @@ int main( void )
exit( EXIT_FAILURE );
}
glfwSetWindowAspectRatio(window, 1, 1);
glfwSetFramebufferSizeCallback(window, reshape);
glfwSetKeyCallback(window, key_callback);
glfwSetMouseButtonCallback(window, mouse_button_callback);

72
include/GLFW/glfw3.h
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@ -1845,6 +1845,78 @@ GLFWAPI void glfwSetWindowPos(GLFWwindow* window, int xpos, int ypos);
*/
GLFWAPI void glfwGetWindowSize(GLFWwindow* window, int* width, int* height);
/*! @brief Sets the size limits of the specified window.
*
* This function sets the size limits of the client area of the specified
* window. If the window is full screen or not resizable, this function does
* nothing.
*
* The size limits are applied immediately and may cause the window to be
* resized.
*
* @param[in] window The window to set limits for.
* @param[in] minwidth The minimum width, in screen coordinates, of the client
* area, or `GLFW_DONT_CARE`.
* @param[in] minheight The minimum height, in screen coordinates, of the
* client area, or `GLFW_DONT_CARE`.
* @param[in] maxwidth The maximum width, in screen coordinates, of the client
* area, or `GLFW_DONT_CARE`.
* @param[in] maxheight The maximum height, in screen coordinates, of the
* client area, or `GLFW_DONT_CARE`.
*
* @remarks If you set size limits and an aspect ratio that conflict, the
* results are undefined.
*
* @par Thread Safety
* This function may only be called from the main thread.
*
* @sa @ref window_sizelimits
* @sa glfwSetWindowAspectRatio
*
* @since Added in GLFW 3.2.
*
* @ingroup window
*/
GLFWAPI void glfwSetWindowSizeLimits(GLFWwindow* window, int minwidth, int minheight, int maxwidth, int maxheight);
/*! @brief Sets the aspect ratio of the specified window.
*
* This function sets the required aspect ratio of the client area of the
* specified window. If the window is full screen or not resizable, this
* function does nothing.
*
* The aspect ratio is specified as a numerator and a denominator. For
* example, the common 16:9 aspect ratio is specified as 16 and 9,
* respectively. The denominator may not be zero.
*
* If the numerator and denominator is set to `GLFW_DONT_CARE` then the window
* may be resized to any aspect ratio permitted by the window system and any
* limits set by @ref glfwSetWindowSizeLimits.
*
* The aspect ratio is applied immediately and may cause the window to be
* resized.
*
* @param[in] window The window to set limits for.
* @param[in] numer The numerator of the desired aspect ratio, or
* `GLFW_DONT_CARE`.
* @param[in] denom The denominator of the desired aspect ratio, or
* `GLFW_DONT_CARE`.
*
* @remarks If you set size limits and an aspect ratio that conflict, the
* results are undefined.
*
* @par Thread Safety
* This function may only be called from the main thread.
*
* @sa @ref window_sizelimits
* @sa glfwSetWindowSizeLimits
*
* @since Added in GLFW 3.2.
*
* @ingroup window
*/
GLFWAPI void glfwSetWindowAspectRatio(GLFWwindow* window, int numer, int denom);
/*! @brief Sets the size of the client area of the specified window.
*
* This function sets the size, in screen coordinates, of the client area of

23
src/cocoa_window.m
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@ -1004,6 +1004,29 @@ void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
[window->ns.object setContentSize:NSMakeSize(width, height)];
}
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
if (minwidth == GLFW_DONT_CARE || minheight == GLFW_DONT_CARE)
[window->ns.object setContentMinSize:NSMakeSize(0, 0)];
else
[window->ns.object setContentMinSize:NSMakeSize(minwidth, minheight)];
if (maxwidth == GLFW_DONT_CARE || maxheight == GLFW_DONT_CARE)
[window->ns.object setContentMaxSize:NSMakeSize(0, 0)];
else
[window->ns.object setContentMaxSize:NSMakeSize(maxwidth, maxheight)];
}
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom)
{
if (numer == GLFW_DONT_CARE || denom == GLFW_DONT_CARE)
[window->ns.object setContentAspectRatio:NSMakeSize(0, 0)];
else
[window->ns.object setContentAspectRatio:NSMakeSize(numer, denom)];
}
void _glfwPlatformGetFramebufferSize(_GLFWwindow* window, int* width, int* height)
{
const NSRect contentRect = [window->ns.view frame];

10
src/internal.h
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@ -540,6 +540,16 @@ void _glfwPlatformGetWindowSize(_GLFWwindow* window, int* width, int* height);
*/
void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height);
/*! @copydoc glfwSetWindowSizeLimits
* @ingroup platform
*/
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window, int minwidth, int minheight, int maxwidth, int maxheight);
/*! @copydoc glfwSetWindowAspectRatio
* @ingroup platform
*/
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom);
/*! @copydoc glfwGetFramebufferSize
* @ingroup platform
*/

14
src/mir_window.c
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@ -529,6 +529,20 @@ void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
mir_surface_spec_release(spec);
}
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Mir: Unsupported function %s", __PRETTY_FUNCTION__);
}
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom)
{
_glfwInputError(GLFW_PLATFORM_ERROR,
"Mir: Unsupported function %s", __PRETTY_FUNCTION__);
}
void _glfwPlatformSetWindowPos(_GLFWwindow* window, int xpos, int ypos)
{
_glfwInputError(GLFW_PLATFORM_ERROR,

4
src/win32_platform.h
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@ -154,6 +154,10 @@ typedef struct _GLFWwindowWin32
GLFWbool cursorTracked;
GLFWbool iconified;
int minwidth, minheight;
int maxwidth, maxheight;
int numer, denom;
// The last received cursor position, regardless of source
int cursorPosX, cursorPosY;

138
src/win32_window.c
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@ -69,6 +69,47 @@ static DWORD getWindowExStyle(const _GLFWwindow* window)
return style;
}
// Translate client window size to full window size (including window borders)
//
static void getFullWindowSize(_GLFWwindow* window,
int clientWidth, int clientHeight,
int* fullWidth, int* fullHeight)
{
RECT rect = { 0, 0, clientWidth, clientHeight };
AdjustWindowRectEx(&rect, getWindowStyle(window),
FALSE, getWindowExStyle(window));
*fullWidth = rect.right - rect.left;
*fullHeight = rect.bottom - rect.top;
}
// Enforce the client rect aspect ratio based on which edge is being dragged
//
static void applyAspectRatio(_GLFWwindow* window, int edge, RECT* area)
{
int xoff, yoff;
const float ratio = (float) window->win32.numer /
(float) window->win32.denom;
getFullWindowSize(window, 0, 0, &xoff, &yoff);
if (edge == WMSZ_LEFT || edge == WMSZ_BOTTOMLEFT ||
edge == WMSZ_RIGHT || edge == WMSZ_BOTTOMRIGHT)
{
area->bottom = area->top + yoff +
(int) ((area->right - area->left - xoff) / ratio);
}
else if (edge == WMSZ_TOPLEFT || edge == WMSZ_TOPRIGHT)
{
area->top = area->bottom - yoff -
(int) ((area->right - area->left - xoff) / ratio);
}
else if (edge == WMSZ_TOP || edge == WMSZ_BOTTOM)
{
area->right = area->left + xoff +
(int) ((area->bottom - area->top - yoff) * ratio);
}
}
// Updates the cursor clip rect
//
static void updateClipRect(_GLFWwindow* window)
@ -503,6 +544,41 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
return 0;
}
case WM_SIZING:
{
if (window->win32.numer == GLFW_DONT_CARE ||
window->win32.denom == GLFW_DONT_CARE)
{
break;
}
applyAspectRatio(window, (int) wParam, (RECT*) lParam);
return TRUE;
}
case WM_GETMINMAXINFO:
{
int xoff, yoff;
MINMAXINFO* mmi = (MINMAXINFO*) lParam;
getFullWindowSize(window, 0, 0, &xoff, &yoff);
if (window->win32.minwidth != GLFW_DONT_CARE &&
window->win32.minheight != GLFW_DONT_CARE)
{
mmi->ptMinTrackSize.x = window->win32.minwidth + xoff;
mmi->ptMinTrackSize.y = window->win32.minheight + yoff;
}
if (window->win32.maxwidth != GLFW_DONT_CARE &&
window->win32.maxheight != GLFW_DONT_CARE)
{
mmi->ptMaxTrackSize.x = window->win32.maxwidth + xoff;
mmi->ptMaxTrackSize.y = window->win32.maxheight + yoff;
}
return 0;
}
case WM_PAINT:
{
_glfwInputWindowDamage(window);
@ -582,19 +658,6 @@ static LRESULT CALLBACK windowProc(HWND hWnd, UINT uMsg,
return DefWindowProc(hWnd, uMsg, wParam, lParam);
}
// Translate client window size to full window size (including window borders)
//
static void getFullWindowSize(_GLFWwindow* window,
int clientWidth, int clientHeight,
int* fullWidth, int* fullHeight)
{
RECT rect = { 0, 0, clientWidth, clientHeight };
AdjustWindowRectEx(&rect, getWindowStyle(window),
FALSE, getWindowExStyle(window));
*fullWidth = rect.right - rect.left;
*fullHeight = rect.bottom - rect.top;
}
// Creates the GLFW window and rendering context
//
static GLFWbool createWindow(_GLFWwindow* window,
@ -677,6 +740,13 @@ static GLFWbool createWindow(_GLFWwindow* window,
if (!_glfwCreateContext(window, ctxconfig, fbconfig))
return GLFW_FALSE;
window->win32.minwidth = GLFW_DONT_CARE;
window->win32.minheight = GLFW_DONT_CARE;
window->win32.maxwidth = GLFW_DONT_CARE;
window->win32.maxheight = GLFW_DONT_CARE;
window->win32.numer = GLFW_DONT_CARE;
window->win32.denom = GLFW_DONT_CARE;
return GLFW_TRUE;
}
@ -872,6 +942,48 @@ void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
}
}
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
RECT area;
window->win32.minwidth = minwidth;
window->win32.minheight = minheight;
window->win32.maxwidth = maxwidth;
window->win32.maxheight = maxheight;
if ((minwidth == GLFW_DONT_CARE || minheight == GLFW_DONT_CARE) &&
(maxwidth == GLFW_DONT_CARE || maxheight == GLFW_DONT_CARE))
{
return;
}
GetWindowRect(window->win32.handle, &area);
MoveWindow(window->win32.handle,
area.left, area.top,
area.right - area.left,
area.bottom - area.top, TRUE);
}
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom)
{
RECT area;
window->win32.numer = numer;
window->win32.denom = denom;
if (numer == GLFW_DONT_CARE || denom == GLFW_DONT_CARE)
return;
GetWindowRect(window->win32.handle, &area);
applyAspectRatio(window, WMSZ_BOTTOMRIGHT, &area);
MoveWindow(window->win32.handle,
area.left, area.top,
area.right - area.left,
area.bottom - area.top, TRUE);
}
void _glfwPlatformGetFramebufferSize(_GLFWwindow* window, int* width, int* height)
{
_glfwPlatformGetWindowSize(window, width, height);

34
src/window.c
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@ -481,6 +481,40 @@ GLFWAPI void glfwSetWindowSize(GLFWwindow* handle, int width, int height)
_glfwPlatformSetWindowSize(window, width, height);
}
GLFWAPI void glfwSetWindowSizeLimits(GLFWwindow* handle,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT();
if (window->monitor || !window->resizable)
return;
_glfwPlatformSetWindowSizeLimits(window,
minwidth, minheight,
maxwidth, maxheight);
}
GLFWAPI void glfwSetWindowAspectRatio(GLFWwindow* handle, int numer, int denom)
{
_GLFWwindow* window = (_GLFWwindow*) handle;
_GLFW_REQUIRE_INIT();
if (window->monitor || !window->resizable)
return;
if (!denom)
{
_glfwInputError(GLFW_INVALID_VALUE, "Denominator cannot be zero");
return;
}
_glfwPlatformSetWindowAspectRatio(window, numer, denom);
}
GLFWAPI void glfwGetFramebufferSize(GLFWwindow* handle, int* width, int* height)
{
_GLFWwindow* window = (_GLFWwindow*) handle;

14
src/wl_window.c
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@ -302,6 +302,20 @@ void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
window->wl.height = height;
}
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
// TODO
fprintf(stderr, "_glfwPlatformSetWindowSizeLimits not implemented yet\n");
}
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom)
{
// TODO
fprintf(stderr, "_glfwPlatformSetWindowAspectRatio not implemented yet\n");
}
void _glfwPlatformGetFramebufferSize(_GLFWwindow* window, int* width, int* height)
{
_glfwPlatformGetWindowSize(window, width, height);

55
src/x11_window.c
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@ -1632,6 +1632,61 @@ void _glfwPlatformSetWindowSize(_GLFWwindow* window, int width, int height)
XFlush(_glfw.x11.display);
}
void _glfwPlatformSetWindowSizeLimits(_GLFWwindow* window,
int minwidth, int minheight,
int maxwidth, int maxheight)
{
long supplied;
XSizeHints* hints = XAllocSizeHints();
if (XGetWMNormalHints(_glfw.x11.display, window->x11.handle, hints, &supplied))
{
if (minwidth == GLFW_DONT_CARE || minwidth == GLFW_DONT_CARE)
hints->flags &= ~PMinSize;
else
{
hints->flags |= PMinSize;
hints->min_width = minwidth;
hints->min_height = minheight;
}
if (maxwidth == GLFW_DONT_CARE || maxwidth == GLFW_DONT_CARE)
hints->flags &= ~PMaxSize;
else
{
hints->flags |= PMaxSize;
hints->max_width = maxwidth;
hints->max_height = maxheight;
}
XSetWMNormalHints(_glfw.x11.display, window->x11.handle, hints);
}
XFree(hints);
}
void _glfwPlatformSetWindowAspectRatio(_GLFWwindow* window, int numer, int denom)
{
long supplied;
XSizeHints* hints = XAllocSizeHints();
if (XGetWMNormalHints(_glfw.x11.display, window->x11.handle, hints, &supplied))
{
if (numer == GLFW_DONT_CARE || denom == GLFW_DONT_CARE)
hints->flags &= ~PAspect;
else
{
hints->flags |= PAspect;
hints->min_aspect.x = hints->max_aspect.x = numer;
hints->min_aspect.y = hints->max_aspect.y = denom;
}
XSetWMNormalHints(_glfw.x11.display, window->x11.handle, hints);
}
XFree(hints);
}
void _glfwPlatformGetFramebufferSize(_GLFWwindow* window, int* width, int* height)
{
_glfwPlatformGetWindowSize(window, width, height);