/*************************************************************************** bitmap.c Core bitmap routines. **************************************************************************** Copyright Aaron Giles All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. * Neither the name 'MAME' nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY AARON GILES ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL AARON GILES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***************************************************************************/ #include "bitmap.h" #ifdef __cplusplus #include #endif /*************************************************************************** BITMAP ALLOCATION/CONFIGURATION ***************************************************************************/ #ifdef __cplusplus /*------------------------------------------------- bitmap_t - basic constructor -------------------------------------------------*/ bitmap_t::bitmap_t() { /* initialize base fields by hand */ alloc = NULL; base = NULL; rowpixels = 0; width = 0; height = 0; format = BITMAP_FORMAT_INVALID; bpp = 0; palette = NULL; cliprect.min_x = cliprect.min_y = 0; cliprect.max_x = cliprect.max_y = 0; } bitmap_t::bitmap_t(int _width, int _height, bitmap_format _format, int _xslop, int _yslop) { /* initialize base fields by hand */ alloc = NULL; base = NULL; rowpixels = (_width + 2 * _xslop + 7) & ~7; width = _width; height = _height; format = _format; bpp = bitmap_format_to_bpp(_format); palette = NULL; cliprect.min_x = cliprect.min_y = 0; cliprect.max_x = width - 1; cliprect.max_y = height - 1; /* fail if invalid format */ if (bpp == 0) throw std::bad_alloc(); /* allocate memory for the bitmap itself */ size_t allocbytes = rowpixels * (height + 2 * _yslop) * bpp / 8; alloc = malloc(allocbytes); if (alloc == NULL) throw std::bad_alloc(); /* clear to 0 by default */ memset(alloc, 0, allocbytes); /* compute the base */ base = (UINT8 *)alloc + (rowpixels * _yslop + _xslop) * (bpp / 8); } bitmap_t::bitmap_t(void *_base, int _width, int _height, int _rowpixels, bitmap_format _format) { /* initialize base fields by hand */ alloc = NULL; base = _base; rowpixels = _rowpixels; width = _width; height = _height; format = _format; bpp = bitmap_format_to_bpp(_format); palette = NULL; cliprect.min_x = cliprect.min_y = 0; cliprect.max_x = width - 1; cliprect.max_y = height - 1; /* fail if invalid format */ if (bpp == 0) throw std::bad_alloc(); } /*------------------------------------------------- ~bitmap_t - basic destructor -------------------------------------------------*/ bitmap_t::~bitmap_t() { /* dereference the palette */ if (palette != NULL) palette_deref(palette); /* free any allocated memory */ if (alloc != NULL) free(alloc); } /*------------------------------------------------- bitmap_alloc -- allocate memory for a new bitmap of the given format -------------------------------------------------*/ bitmap_t *bitmap_alloc(int width, int height, bitmap_format format) { return new bitmap_t(width, height, format); } /*------------------------------------------------- bitmap_alloc_slop -- allocate a new bitmap with additional slop on the borders -------------------------------------------------*/ bitmap_t *bitmap_alloc_slop(int width, int height, int xslop, int yslop, bitmap_format format) { return new bitmap_t(width, height, format, xslop, yslop); } /*------------------------------------------------- bitmap_wrap -- wrap an existing memory buffer as a bitmap -------------------------------------------------*/ bitmap_t *bitmap_wrap(void *base, int width, int height, int rowpixels, bitmap_format format) { return new bitmap_t(base, width, height, rowpixels, format); } /*------------------------------------------------- bitmap_free -- release memory allocated for a bitmap -------------------------------------------------*/ void bitmap_free(bitmap_t *bitmap) { delete bitmap; } #else /*------------------------------------------------- bitmap_alloc -- allocate memory for a new bitmap of the given format -------------------------------------------------*/ bitmap_t *bitmap_alloc(int width, int height, bitmap_format format) { return bitmap_alloc_slop(width, height, 0, 0, format); } /*------------------------------------------------- bitmap_alloc_slop -- allocate a new bitmap with additional slop on the borders -------------------------------------------------*/ bitmap_t *bitmap_alloc_slop(int width, int height, int xslop, int yslop, bitmap_format format) { int bpp = bitmap_format_to_bpp(format); size_t allocbytes; bitmap_t *bitmap; int rowpixels; /* fail if invalid format */ if (bpp == 0) return NULL; /* allocate the bitmap itself */ bitmap = (bitmap_t *)malloc(sizeof(*bitmap)); if (bitmap == NULL) return NULL; memset(bitmap, 0, sizeof(*bitmap)); /* round the width to a multiple of 8 and add some padding */ rowpixels = (width + 2 * xslop + 7) & ~7; /* allocate memory for the bitmap itself */ allocbytes = rowpixels * (height + 2 * yslop) * bpp / 8; bitmap->alloc = malloc(allocbytes); if (bitmap->alloc == NULL) { free(bitmap); return NULL; } /* clear to 0 by default */ memset(bitmap->alloc, 0, allocbytes); /* fill in the data */ bitmap->format = format; bitmap->width = width; bitmap->height = height; bitmap->bpp = bpp; bitmap->rowpixels = rowpixels; bitmap->base = (UINT8 *)bitmap->alloc + (rowpixels * yslop + xslop) * (bpp / 8); bitmap->cliprect.min_x = 0; bitmap->cliprect.max_x = width - 1; bitmap->cliprect.min_y = 0; bitmap->cliprect.max_y = height - 1; return bitmap; } /*------------------------------------------------- bitmap_wrap -- wrap an existing memory buffer as a bitmap -------------------------------------------------*/ bitmap_t *bitmap_wrap(void *base, int width, int height, int rowpixels, bitmap_format format) { int bpp = bitmap_format_to_bpp(format); bitmap_t *bitmap; /* fail if invalid format */ if (bpp == 0) return NULL; /* allocate memory */ bitmap = (bitmap_t *)malloc(sizeof(*bitmap)); if (bitmap == NULL) return NULL; memset(bitmap, 0, sizeof(*bitmap)); /* fill in the data */ bitmap->format = format; bitmap->width = width; bitmap->height = height; bitmap->bpp = bpp; bitmap->rowpixels = rowpixels; bitmap->base = base; bitmap->cliprect.min_x = 0; bitmap->cliprect.max_x = width - 1; bitmap->cliprect.min_y = 0; bitmap->cliprect.max_y = height - 1; return bitmap; } /*------------------------------------------------- bitmap_free -- release memory allocated for a bitmap -------------------------------------------------*/ void bitmap_free(bitmap_t *bitmap) { /* dereference the palette */ if (bitmap->palette != NULL) palette_deref(bitmap->palette); /* free any allocated memory */ if (bitmap->alloc != NULL) free(bitmap->alloc); /* free the bitmap */ free(bitmap); } #endif /*------------------------------------------------- bitmap_clone_existing -- clone an existing bitmap by copying its fields; the target bitmap does not own the memory -------------------------------------------------*/ void bitmap_clone_existing(bitmap_t *bitmap, const bitmap_t *srcbitmap) { if (bitmap->alloc != NULL) free(bitmap->alloc); bitmap->alloc = NULL; bitmap->base = srcbitmap->base; bitmap->rowpixels = srcbitmap->rowpixels; bitmap->width = srcbitmap->width; bitmap->height = srcbitmap->height; bitmap->format = srcbitmap->format; bitmap->bpp = srcbitmap->bpp; bitmap->palette = srcbitmap->palette; bitmap->cliprect = srcbitmap->cliprect; } /*------------------------------------------------- bitmap_set_palette -- associate a palette with a bitmap -------------------------------------------------*/ void bitmap_set_palette(bitmap_t *bitmap, palette_t *palette) { /* first dereference any existing palette */ if (bitmap->palette != NULL) { palette_deref(bitmap->palette); bitmap->palette = NULL; } /* then reference any new palette */ if (palette != NULL) { palette_ref(palette); bitmap->palette = palette; } } /*************************************************************************** BITMAP DRAWING ***************************************************************************/ /*------------------------------------------------- bitmap_fill -- fill a bitmap with a solid color -------------------------------------------------*/ void bitmap_fill(bitmap_t *dest, const rectangle *cliprect, UINT32 color) { rectangle fill = dest->cliprect; int x, y; /* if we have a cliprect, intersect with that */ if (cliprect != NULL) sect_rect(&fill, cliprect); /* early out if nothing to do */ if (fill.min_x > fill.max_x || fill.min_y > fill.max_y) return; /* based on the bpp go from there */ switch (dest->bpp) { case 8: /* 8bpp always uses memset */ for (y = fill.min_y; y <= fill.max_y; y++) memset(BITMAP_ADDR8(dest, y, fill.min_x), (UINT8)color, fill.max_x + 1 - fill.min_x); break; case 16: /* 16bpp can use memset if the bytes are equal */ if ((UINT8)(color >> 8) == (UINT8)color) { for (y = fill.min_y; y <= fill.max_y; y++) memset(BITMAP_ADDR16(dest, y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 2); } else { UINT16 *destrow, *destrow0; /* Fill the first line the hard way */ destrow = BITMAP_ADDR16(dest, fill.min_y, 0); for (x = fill.min_x; x <= fill.max_x; x++) destrow[x] = (UINT16)color; /* For the other lines, just copy the first one */ destrow0 = BITMAP_ADDR16(dest, fill.min_y, fill.min_x); for (y = fill.min_y + 1; y <= fill.max_y; y++) { destrow = BITMAP_ADDR16(dest, y, fill.min_x); memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 2); } } break; case 32: /* 32bpp can use memset if the bytes are equal */ if ((UINT8)(color >> 8) == (UINT8)color && (UINT16)(color >> 16) == (UINT16)color) { for (y = fill.min_y; y <= fill.max_y; y++) memset(BITMAP_ADDR32(dest, y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 4); } else { UINT32 *destrow, *destrow0; /* Fill the first line the hard way */ destrow = BITMAP_ADDR32(dest, fill.min_y, 0); for (x = fill.min_x; x <= fill.max_x; x++) destrow[x] = (UINT32)color; /* For the other lines, just copy the first one */ destrow0 = BITMAP_ADDR32(dest, fill.min_y, fill.min_x); for (y = fill.min_y + 1; y <= fill.max_y; y++) { destrow = BITMAP_ADDR32(dest, y, fill.min_x); memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 4); } } break; case 64: /* 64bpp can use memset if the bytes are equal */ if ((UINT8)(color >> 8) == (UINT8)color && (UINT16)(color >> 16) == (UINT16)color) { for (y = fill.min_y; y <= fill.max_y; y++) memset(BITMAP_ADDR64(dest, y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 4); } else { UINT64 *destrow, *destrow0; /* Fill the first line the hard way */ destrow = BITMAP_ADDR64(dest, fill.min_y, 0); for (x = fill.min_x; x <= fill.max_x; x++) destrow[x] = (UINT64)color; /* For the other lines, just copy the first one */ destrow0 = BITMAP_ADDR64(dest, fill.min_y, fill.min_x); for (y = fill.min_y + 1; y <= fill.max_y; y++) { destrow = BITMAP_ADDR64(dest, y, fill.min_x); memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 4); } } break; } } /*************************************************************************** BITMAP UTILITIES ***************************************************************************/ /*------------------------------------------------- bitmap_format_to_bpp - given a format, return the bpp -------------------------------------------------*/ int bitmap_format_to_bpp(bitmap_format format) { /* choose a depth for the format */ switch (format) { case BITMAP_FORMAT_INDEXED8: return 8; case BITMAP_FORMAT_INDEXED16: case BITMAP_FORMAT_RGB15: case BITMAP_FORMAT_YUY16: return 16; case BITMAP_FORMAT_INDEXED32: case BITMAP_FORMAT_RGB32: case BITMAP_FORMAT_ARGB32: return 32; case BITMAP_FORMAT_INDEXED64: return 64; default: break; } return 0; }