From 876c97454a954a70da8b8b3d8b09b52674534062 Mon Sep 17 00:00:00 2001
From: Dimitriy Ryazantcev <[EMAIL REDACTED]>
Date: Sat, 26 Nov 2022 18:37:10 +0200
Subject: [PATCH] Cleanup WIN_CreateCursor() code a bit
Closes #6476
---
src/video/SDL_shape.c | 10 ++-
src/video/SDL_shape_internals.h | 2 +-
src/video/windows/SDL_windowsmouse.c | 94 +++++++++++++---------------
src/video/x11/SDL_x11shape.c | 2 +-
4 files changed, 52 insertions(+), 56 deletions(-)
diff --git a/src/video/SDL_shape.c b/src/video/SDL_shape.c
index 2362ed7f7f38..cb8d7c2f49ba 100644
--- a/src/video/SDL_shape.c
+++ b/src/video/SDL_shape.c
@@ -55,14 +55,15 @@ SDL_bool SDL_IsShapedWindow(const SDL_Window *window)
return (window->shaper != NULL);
}
-/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte. */
-void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb)
+/* REQUIRES that bitmap point to a w-by-h bitmap with ppb pixels-per-byte and alignBytes scan line alignment. */
+void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8* bitmap, Uint8 ppb, Uint8 alignBytes)
{
int x = 0;
int y = 0;
Uint8 r = 0, g = 0, b = 0, alpha = 0;
Uint32 mask_value = 0;
- size_t bytes_per_scanline = (size_t)(shape->w + (ppb - 1)) / ppb;
+ int bytes_per_scanline;
+
Uint8 *bitmap_scanline;
SDL_Color key;
@@ -70,6 +71,9 @@ void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint
SDL_LockSurface(shape);
}
+ bytes_per_scanline = (shape->w + (ppb - 1)) / ppb;
+ bytes_per_scanline = (bytes_per_scanline + (alignBytes - 1)) & ~(alignBytes - 1);
+
SDL_memset(bitmap, 0, shape->h * bytes_per_scanline);
for (y = 0; y < shape->h; y++) {
diff --git a/src/video/SDL_shape_internals.h b/src/video/SDL_shape_internals.h
index fa8e90adbf89..85e164c5b6d7 100644
--- a/src/video/SDL_shape_internals.h
+++ b/src/video/SDL_shape_internals.h
@@ -51,7 +51,7 @@ typedef struct SDL_ShapeTree
typedef void (*SDL_TraversalFunction)(SDL_ShapeTree *, void *);
-extern void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb);
+extern void SDL_CalculateShapeBitmap(SDL_WindowShapeMode mode, SDL_Surface *shape, Uint8 *bitmap, Uint8 ppb, Uint8 alignBytes);
extern SDL_ShapeTree *SDL_CalculateShapeTree(SDL_WindowShapeMode mode, SDL_Surface *shape);
extern void SDL_TraverseShapeTree(SDL_ShapeTree *tree, SDL_TraversalFunction function, void *closure);
extern void SDL_FreeShapeTree(SDL_ShapeTree **shape_tree);
diff --git a/src/video/windows/SDL_windowsmouse.c b/src/video/windows/SDL_windowsmouse.c
index 44491d37abcb..b9d77af31f07 100644
--- a/src/video/windows/SDL_windowsmouse.c
+++ b/src/video/windows/SDL_windowsmouse.c
@@ -26,6 +26,8 @@
#include "../../events/SDL_mouse_c.h"
+#include "../SDL_shape_internals.h"
+
DWORD SDL_last_warp_time = 0;
HCURSOR SDL_cursor = NULL;
static SDL_Cursor *SDL_blank_cursor = NULL;
@@ -86,81 +88,71 @@ static SDL_Cursor *WIN_CreateDefaultCursor()
static SDL_Cursor *WIN_CreateCursor(SDL_Surface *surface, int hot_x, int hot_y)
{
- /* msdn says cursor mask has to be padded out to word alignment. Not sure
- if that means machine word or WORD, but this handles either case. */
- const size_t pad = (sizeof(size_t) * 8); /* 32 or 64, or whatever. */
- SDL_Cursor *cursor;
HICON hicon;
- HICON hcursor;
- HDC hdc;
- BITMAPV4HEADER bmh;
- LPVOID pixels;
- LPVOID maskbits;
- size_t maskbitslen;
- SDL_bool isstack;
+ SDL_Cursor *cursor;
+ BITMAPV5HEADER bmh;
ICONINFO ii;
+ HBITMAP colorBitmap = NULL, maskBitmap = NULL;
+ LPVOID colorBits, maskBits;
+ int maskPitch;
SDL_zero(bmh);
- bmh.bV4Size = sizeof(bmh);
- bmh.bV4Width = surface->w;
- bmh.bV4Height = -surface->h; /* Invert the image */
- bmh.bV4Planes = 1;
- bmh.bV4BitCount = 32;
- bmh.bV4V4Compression = BI_BITFIELDS;
- bmh.bV4AlphaMask = 0xFF000000;
- bmh.bV4RedMask = 0x00FF0000;
- bmh.bV4GreenMask = 0x0000FF00;
- bmh.bV4BlueMask = 0x000000FF;
-
- maskbitslen = ((surface->w + (pad - (surface->w % pad))) / 8) * surface->h;
- maskbits = SDL_small_alloc(Uint8, maskbitslen, &isstack);
- if (!maskbits) {
- SDL_OutOfMemory();
+ bmh.bV5Size = sizeof(bmh);
+ bmh.bV5Width = surface->w;
+ bmh.bV5Height = -surface->h; /* Invert the image to make it top-down. */
+ bmh.bV5Planes = 1;
+ bmh.bV5BitCount = surface->format->BitsPerPixel;
+ bmh.bV5Compression = BI_BITFIELDS;
+ bmh.bV5RedMask = surface->format->Rmask;
+ bmh.bV5GreenMask = surface->format->Gmask;
+ bmh.bV5BlueMask = surface->format->Bmask;
+ bmh.bV5AlphaMask = surface->format->Amask;
+
+ colorBitmap = CreateDIBSection(NULL, (BITMAPINFO *) &bmh, DIB_RGB_COLORS, &colorBits, NULL, 0);
+
+ if (!colorBitmap || !colorBits) {
+ WIN_SetError("CreateDIBSection()");
return NULL;
}
- /* AND the cursor against full bits: no change. We already have alpha. */
- SDL_memset(maskbits, 0xFF, maskbitslen);
+ SDL_memcpy(colorBits, surface->pixels, surface->pitch * surface->h);
+
+ /* Scan lines in 1 bpp mask should be aligned to WORD boundary. */
+ maskPitch = (((surface->w + 15) & ~15) / 8);
+ if ((maskBits = SDL_stack_alloc(Uint8, maskPitch * surface->h))) {
+ SDL_WindowShapeMode mode = { ShapeModeDefault };
+ SDL_CalculateShapeBitmap(mode, surface, maskBits, 8, sizeof(WORD));
+ maskBitmap = CreateBitmap(surface->w, surface->h, 1, 1, maskBits);
+ SDL_stack_free(maskBits);
+ }
- hdc = GetDC(NULL);
SDL_zero(ii);
ii.fIcon = FALSE;
ii.xHotspot = (DWORD)hot_x;
ii.yHotspot = (DWORD)hot_y;
- ii.hbmColor = CreateDIBSection(hdc, (BITMAPINFO *)&bmh, DIB_RGB_COLORS, &pixels, NULL, 0);
- ii.hbmMask = CreateBitmap(surface->w, surface->h, 1, 1, maskbits);
- ReleaseDC(NULL, hdc);
- SDL_small_free(maskbits, isstack);
-
- SDL_assert(surface->format->format == SDL_PIXELFORMAT_ARGB8888);
- SDL_assert(surface->pitch == surface->w * 4);
- SDL_memcpy(pixels, surface->pixels, (size_t)surface->h * surface->pitch);
+ ii.hbmColor = colorBitmap;
+ ii.hbmMask = maskBitmap;
hicon = CreateIconIndirect(&ii);
- DeleteObject(ii.hbmColor);
- DeleteObject(ii.hbmMask);
-
- if (!hicon) {
- WIN_SetError("CreateIconIndirect()");
- return NULL;
+ if (colorBitmap) {
+ DeleteObject(colorBitmap);
}
- /* The cursor returned by CreateIconIndirect does not respect system cursor size
- preference, use CopyImage to duplicate the cursor with desired sizes */
- hcursor = CopyImage(hicon, IMAGE_CURSOR, surface->w, surface->h, 0);
- DestroyIcon(hicon);
+ if (maskBitmap) {
+ DeleteObject(maskBitmap);
+ }
- if (!hcursor) {
- WIN_SetError("CopyImage()");
+ if (!hicon) {
+ WIN_SetError("CreateIconIndirect()");
return NULL;
}
cursor = SDL_calloc(1, sizeof(*cursor));
if (cursor) {
- cursor->driverdata = hcursor;
+ cursor->driverdata = hicon;
} else {
- DestroyIcon(hcursor);
+ DestroyIcon(hicon);
SDL_OutOfMemory();
}
diff --git a/src/video/x11/SDL_x11shape.c b/src/video/x11/SDL_x11shape.c
index 373d6eba1ae4..f1fd20e145a2 100644
--- a/src/video/x11/SDL_x11shape.c
+++ b/src/video/x11/SDL_x11shape.c
@@ -81,7 +81,7 @@ int X11_SetWindowShape(SDL_WindowShaper *shaper, SDL_Surface *shape, SDL_WindowS
data = shaper->driverdata;
/* Assume that shaper->alphacutoff already has a value, because SDL_SetWindowShape() should have given it one. */
- SDL_CalculateShapeBitmap(shaper->mode, shape, data->bitmap, 8);
+ SDL_CalculateShapeBitmap(shaper->mode, shape, data->bitmap, 8, 1);
windowdata = shaper->window->driverdata;
shapemask = X11_XCreateBitmapFromData(windowdata->videodata->display, windowdata->xwindow, data->bitmap, shaper->window->w, shaper->window->h);