From 4ba9ff892c2176d4aeefe1a8287cdb899acf5da1 Mon Sep 17 00:00:00 2001 From: Margaret Matocha Date: Mon, 10 Aug 2020 11:04:56 -0500 Subject: Added bitmap.blit function for copying slices of bitmaps --- shared-module/displayio/Bitmap.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'shared-module') diff --git a/shared-module/displayio/Bitmap.c b/shared-module/displayio/Bitmap.c index 8bcda6086..dde346ad3 100644 --- a/shared-module/displayio/Bitmap.c +++ b/shared-module/displayio/Bitmap.c @@ -105,6 +105,37 @@ uint32_t common_hal_displayio_bitmap_get_pixel(displayio_bitmap_t *self, int16_t return 0; } +void common_hal_displayio_bitmap_blit(displayio_bitmap_t *self, int16_t x, int16_t y, displayio_bitmap_t *source, + int16_t x1, int16_t y1, int16_t x2, int16_t y2) { + // Copy complete "source" bitmap into "self" bitmap at location x,y in the "self" + // Add a boolean to determine if all values are copied, or only if non-zero + // Default is copy all values, but for text glyphs this should copy only non-zero values + + if (self->read_only) { + mp_raise_RuntimeError(translate("Read-only object")); + } + + // If this value is encountered in the source bitmap, it will not be copied (for text glyphs) + // This should be added as an optional parameter, and if it is `None`, then all pixels are copied + uint32_t skip_value=0; + + // simplest version - use internal functions for get/set pixels + for (uint16_t i=0; i<= (x2-x1) ; i++) { + if ( (x+i >= 0) && (x+i < self->width) ) { + for (uint16_t j=0; j<= (y2-y1) ; j++){ + if ((y+j >= 0) && (y+j < self->height) ) { + uint32_t value = common_hal_displayio_bitmap_get_pixel(source, x1+i, y1+j); + if ( (value != skip_value) ) { + common_hal_displayio_bitmap_set_pixel(self, x+i, y+j, value); + } + } + } + } + } + +} + + void common_hal_displayio_bitmap_set_pixel(displayio_bitmap_t *self, int16_t x, int16_t y, uint32_t value) { if (self->read_only) { mp_raise_RuntimeError(translate("Read-only object")); -- cgit v1.2.3