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Diffstat (limited to 'framebuffer/bitmap.c')
| -rw-r--r-- | framebuffer/bitmap.c | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/framebuffer/bitmap.c b/framebuffer/bitmap.c new file mode 100644 index 000000000..4f9e90647 --- /dev/null +++ b/framebuffer/bitmap.c @@ -0,0 +1,259 @@ +/* + * Copyright 2008 Vincent Sanders <vince@simtec.co.uk> + * + * This file is part of NetSurf, http://www.netsurf-browser.org/ + * + * NetSurf is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * NetSurf 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +#include <inttypes.h> +#include <sys/types.h> + +#include "assert.h" +#include "image/bitmap.h" +#include "framebuffer/bitmap.h" + +#include "utils/log.h" + +/** + * Create a bitmap. + * + * \param width width of image in pixels + * \param height width of image in pixels + * \param state a flag word indicating the initial state + * \return an opaque struct bitmap, or NULL on memory exhaustion + */ + +void *bitmap_create(int width, int height, unsigned int state) +{ + struct bitmap *bitmap; + + LOG(("width %d, height %d, state %u",width,height,state)); + + bitmap = calloc(1 , sizeof(struct bitmap)); + if (bitmap) { + bitmap->pixdata = calloc(4, width * height); + if (bitmap->pixdata != NULL) { + bitmap->width = width; + bitmap->height = height; + bitmap->opaque = false; + } else { + free(bitmap); + bitmap=NULL; + } + } + + LOG(("bitmap %p", bitmap)); + + return bitmap; +} + + +/** + * Return a pointer to the pixel data in a bitmap. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return pointer to the pixel buffer + * + * The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end + * of rows. The width of a row in bytes is given by bitmap_get_rowstride(). + */ + +unsigned char *bitmap_get_buffer(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return NULL; + } + + return bm->pixdata; +} + + +/** + * Find the width of a pixel row in bytes. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return width of a pixel row in the bitmap + */ + +size_t bitmap_get_rowstride(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return 0; + } + + return (bm->width) * 4; +} + + +/** + * Free a bitmap. + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ + +void bitmap_destroy(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return; + } + + free(bm->pixdata); + free(bm); +} + + +/** + * Save a bitmap in the platform's native format. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \param path pathname for file + * \return true on success, false on error and error reported + */ + +bool bitmap_save(void *bitmap, const char *path, unsigned flags) +{ + return true; +} + + +/** + * The bitmap image has changed, so flush any persistant cache. + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ +void bitmap_modified(void *bitmap) { +} + + +/** + * The bitmap image can be suspended. + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \param private_word a private word to be returned later + * \param suspend the function to be called upon suspension + * \param resume the function to be called when resuming + */ +void bitmap_set_suspendable(void *bitmap, void *private_word, + void (*invalidate)(void *bitmap, void *private_word)) { +} + +/** + * Sets whether a bitmap should be plotted opaque + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \param opaque whether the bitmap should be plotted opaque + */ +void bitmap_set_opaque(void *bitmap, bool opaque) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return; + } + + LOG(("setting bitmap %p to %s", bm, opaque?"opaque":"transparent")); + bm->opaque = opaque; +} + + +/** + * Tests whether a bitmap has an opaque alpha channel + * + * \param bitmap a bitmap, as returned by bitmap_create() + * \return whether the bitmap is opaque + */ +bool bitmap_test_opaque(void *bitmap) +{ + int tst; + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return false; + } + + tst = bm->width * bm->height; + + while (tst-- > 0) { + if (bm->pixdata[(tst << 2) + 3] != 0xff) { + LOG(("bitmap %p has transparency",bm)); + return false; + } + } + LOG(("bitmap %p is opaque", bm)); + return true; +} + + +/** + * Gets whether a bitmap should be plotted opaque + * + * \param bitmap a bitmap, as returned by bitmap_create() + */ +bool bitmap_get_opaque(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return false; + } + + return bm->opaque; +} + +int bitmap_get_width(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return 0; + } + + return(bm->width); +} + +int bitmap_get_height(void *bitmap) +{ + struct bitmap *bm = bitmap; + + if (bitmap == NULL) { + LOG(("NULL bitmap!")); + return 0; + } + + return(bm->height); +} + +size_t bitmap_get_bpp(void *bitmap) +{ + return 4; +} + +/* + * Local Variables: + * c-basic-offset:8 + * End: + */ |