Alexandre Julliard : gdi32: Clip solid pen regions to the DIB rectangle to avoid overflows.
Module: wine Branch: master Commit: 6714f16c74180c450edb8b9f9bdba43c14c0b8e0 URL: http://source.winehq.org/git/wine.git/?a=commit;h=6714f16c74180c450edb8b9f9b... Author: Alexandre Julliard <julliard(a)winehq.org> Date: Mon Jul 30 13:59:04 2012 +0200 gdi32: Clip solid pen regions to the DIB rectangle to avoid overflows. --- dlls/gdi32/dibdrv/dc.c | 12 +++ dlls/gdi32/dibdrv/dibdrv.h | 1 + dlls/gdi32/dibdrv/objects.c | 177 +++++++++++++++++++++++++------------------ 3 files changed, 116 insertions(+), 74 deletions(-) diff --git a/dlls/gdi32/dibdrv/dc.c b/dlls/gdi32/dibdrv/dc.c index de64d18..73895c9 100644 --- a/dlls/gdi32/dibdrv/dc.c +++ b/dlls/gdi32/dibdrv/dc.c @@ -255,6 +255,18 @@ DWORD convert_bitmapinfo( const BITMAPINFO *src_info, void *src_bits, struct bit return ERROR_SUCCESS; } +int clip_rect_to_dib( const dib_info *dib, RECT *rc ) +{ + RECT rect; + + rect.left = max( 0, -dib->rect.left ); + rect.top = max( 0, -dib->rect.top ); + rect.right = min( dib->rect.right, dib->width ) - dib->rect.left; + rect.bottom = min( dib->rect.bottom, dib->height ) - dib->rect.top; + if (is_rect_empty( &rect )) return 0; + return intersect_rect( rc, &rect, rc ); +} + int get_clipped_rects( const dib_info *dib, const RECT *rc, HRGN clip, struct clipped_rects *clip_rects ) { const WINEREGION *region; diff --git a/dlls/gdi32/dibdrv/dibdrv.h b/dlls/gdi32/dibdrv/dibdrv.h index 7802d17..0a99fba 100644 --- a/dlls/gdi32/dibdrv/dibdrv.h +++ b/dlls/gdi32/dibdrv/dibdrv.h @@ -244,6 +244,7 @@ extern void copy_dib_color_info(dib_info *dst, const dib_info *src) DECLSPEC_HID extern BOOL convert_dib(dib_info *dst, const dib_info *src) DECLSPEC_HIDDEN; extern COLORREF make_rgb_colorref( HDC hdc, dib_info *dib, COLORREF color, BOOL *got_pixel, DWORD *pixel ) DECLSPEC_HIDDEN; extern DWORD get_pixel_color(dibdrv_physdev *pdev, COLORREF color, BOOL mono_fixup) DECLSPEC_HIDDEN; +extern int clip_rect_to_dib( const dib_info *dib, RECT *rc ) DECLSPEC_HIDDEN; extern int get_clipped_rects( const dib_info *dib, const RECT *rc, HRGN clip, struct clipped_rects *clip_rects ) DECLSPEC_HIDDEN; extern void add_clipped_bounds( dibdrv_physdev *dev, const RECT *rect, HRGN clip ) DECLSPEC_HIDDEN; extern int clip_line(const POINT *start, const POINT *end, const RECT *clip, diff --git a/dlls/gdi32/dibdrv/objects.c b/dlls/gdi32/dibdrv/objects.c index 0292537..f9736f6 100644 --- a/dlls/gdi32/dibdrv/objects.c +++ b/dlls/gdi32/dibdrv/objects.c @@ -654,6 +654,87 @@ static BOOL solid_pen_line(dibdrv_physdev *pdev, POINT *start, POINT *end, DWORD return TRUE; } +static void solid_line_region( const dib_info *dib, const POINT *start, const struct line_params *params, + HRGN region ) +{ + int len, err = params->err_start; + RECT rect; + + rect.left = start->x; + rect.top = start->y; + rect.right = start->x + 1; + rect.bottom = start->y + 1; + + if (params->x_major) + { + if (params->x_inc > 0) + { + for (len = params->length; len; len--, rect.right++) + { + if (err + params->bias > 0) + { + add_rect_to_region( region, &rect ); + rect.left = rect.right; + rect.top += params->y_inc; + rect.bottom += params->y_inc; + err += params->err_add_1; + } + else err += params->err_add_2; + } + } + else + { + for (len = params->length; len; len--, rect.left--) + { + if (err + params->bias > 0) + { + add_rect_to_region( region, &rect ); + rect.right = rect.left; + rect.top += params->y_inc; + rect.bottom += params->y_inc; + err += params->err_add_1; + } + else err += params->err_add_2; + } + } + } + else + { + if (params->y_inc > 0) + { + for (len = params->length; len; len--, rect.bottom++) + { + if (err + params->bias > 0) + { + add_rect_to_region( region, &rect ); + rect.top = rect.bottom; + rect.left += params->x_inc; + rect.right += params->x_inc; + err += params->err_add_1; + } + else err += params->err_add_2; + } + } + else + { + for (len = params->length; len; len--, rect.top--) + { + if (err + params->bias > 0) + { + add_rect_to_region( region, &rect ); + rect.bottom = rect.top; + rect.left += params->x_inc; + rect.right += params->x_inc; + err += params->err_add_1; + } + else err += params->err_add_2; + } + } + } + /* add final rect */ + add_rect_to_region( region, &rect ); +} + static BOOL solid_pen_line_region( dibdrv_physdev *pdev, POINT *start, POINT *end, HRGN region ) { RECT rect; @@ -667,99 +748,47 @@ static BOOL solid_pen_line_region( dibdrv_physdev *pdev, POINT *start, POINT *en { rect.right = end->x; order_end_points(&rect.left, &rect.right); - add_rect_to_region( region, &rect ); + if (clip_rect_to_dib( &pdev->dib, &rect )) add_rect_to_region( region, &rect ); } else if(start->x == end->x) { rect.bottom = end->y; order_end_points(&rect.top, &rect.bottom); - add_rect_to_region( region, &rect ); + if (clip_rect_to_dib( &pdev->dib, &rect )) add_rect_to_region( region, &rect ); } else { - INT dx = end->x - start->x, dy = end->y - start->y; - INT abs_dx = abs(dx), abs_dy = abs(dy); - DWORD octant = get_octant_mask(dx, dy); - INT bias = get_bias( octant ); + bres_params clip_params; + struct line_params line_params; + POINT p1 = crop_coords( *start ), p2 = crop_coords( *end ); - if (is_xmajor( octant )) + init_bres_params( start, end, &clip_params, &line_params, &rect ); + if (clip_rect_to_dib( &pdev->dib, &rect )) { - int y_inc = is_y_increasing( octant ) ? 1 : -1; - int err_add_1 = 2 * abs_dy - 2 * abs_dx; - int err_add_2 = 2 * abs_dy; - int err = 2 * abs_dy - abs_dx; + POINT clipped_start, clipped_end; - if (is_x_increasing( octant )) - { - for (rect.right = start->x + 1; rect.right <= end->x; rect.right++) - { - if (err + bias > 0) - { - add_rect_to_region( region, &rect ); - rect.left = rect.right; - rect.top += y_inc; - rect.bottom += y_inc; - err += err_add_1; - } - else err += err_add_2; - } - } - else + if (clip_line( &p1, &p2, &rect, &clip_params, &clipped_start, &clipped_end )) { - for (rect.left = start->x; rect.left > end->x; rect.left--) - { - if (err + bias > 0) - { - add_rect_to_region( region, &rect ); - rect.right = rect.left; - rect.top += y_inc; - rect.bottom += y_inc; - err += err_add_1; - } - else err += err_add_2; - } - } - } - else - { - int x_inc = is_x_increasing( octant ) ? 1 : -1; - int err_add_1 = 2 * abs_dx - 2 * abs_dy; - int err_add_2 = 2 * abs_dx; - int err = 2 * abs_dx - abs_dy; + int m = abs(clipped_start.x - p1.x); + int n = abs(clipped_start.y - p1.y); - if (is_y_increasing( octant )) - { - for (rect.bottom = start->y + 1; rect.bottom <= end->y; rect.bottom++) + if (line_params.x_major) { - if (err + bias > 0) - { - add_rect_to_region( region, &rect ); - rect.top = rect.bottom; - rect.left += x_inc; - rect.right += x_inc; - err += err_add_1; - } - else err += err_add_2; + line_params.err_start = 2 * clip_params.dy - clip_params.dx + + m * 2 * clip_params.dy - n * 2 * clip_params.dx; + line_params.length = abs( clipped_end.x - clipped_start.x ) + 1; } - } - else - { - for (rect.top = start->y; rect.top > end->y; rect.top--) + else { - if (err + bias > 0) - { - add_rect_to_region( region, &rect ); - rect.bottom = rect.top; - rect.left += x_inc; - rect.right += x_inc; - err += err_add_1; - } - else err += err_add_2; + line_params.err_start = 2 * clip_params.dx - clip_params.dy + + n * 2 * clip_params.dx - m * 2 * clip_params.dy; + line_params.length = abs( clipped_end.y - clipped_start.y ) + 1; } + + if (clipped_end.x == p2.x && clipped_end.y == p2.y) line_params.length--; + solid_line_region( &pdev->dib, &clipped_start, &line_params, region ); } } - /* add final rect */ - add_rect_to_region( region, &rect ); } return TRUE; }
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Alexandre Julliard