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-rw-r--r--sdl2/surface.scm201
1 files changed, 199 insertions, 2 deletions
diff --git a/sdl2/surface.scm b/sdl2/surface.scm
index 8017d78..c47efb7 100644
--- a/sdl2/surface.scm
+++ b/sdl2/surface.scm
@@ -27,22 +27,213 @@
#:use-module (ice-9 format)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
+ #:use-module (srfi srfi-4)
+ #:use-module (srfi srfi-9)
#:use-module (system foreign)
#:use-module ((sdl2 bindings) #:prefix ffi:)
#:use-module (sdl2)
- #:export (make-rgb-surface
+ #:export (color?
+ color-r
+ color-g
+ color-b
+ color-a
+
+ palette?
+ palette-length
+ palette-colors
+
+ pixel-format?
+ pixel-format-palette
+ pixel-format-bits-per-pixel
+ pixel-format-bytes-per-pixel
+ pixel-format-red-mask
+ pixel-format-green-mask
+ pixel-format-blue-mask
+ pixel-format-alpha-mask
+
+ make-rgb-surface
bytevector->surface
surface?
delete-surface!
call-with-surface
load-bmp
+ surface-pixel-format
surface-width
surface-height
surface-pitch
surface-pixels
-
convert-surface-format))
+
+;;;
+;;; Color
+;;;
+
+(define-record-type <color>
+ (make-color r g b a)
+ color?
+ (r color-r)
+ (g color-g)
+ (b color-b)
+ (a color-a))
+
+
+;;;
+;;; Palette
+;;;
+
+(define-wrapped-pointer-type <palette>
+ palette?
+ wrap-palette unwrap-palette
+ (lambda (palette port)
+ (format port "#<palette length: ~d>"
+ (palette-length palette))))
+
+(define %palette-types
+ (list int ; number of colors
+ '*)) ; colors
+
+(define-syntax-rule (palette-parse-match palette matchers ...)
+ (match (parse-c-struct (unwrap-palette palette) %palette-types)
+ matchers ...))
+
+(define (palette-length palette)
+ "Return the number of colors in PALETTE."
+ (palette-parse-match palette
+ ((length _) length)))
+
+(define (palette-colors palette)
+ "Return the colors in PALETTE."
+ (palette-parse-match palette
+ ((length colors)
+ (let ((bv (pointer->bytevector colors (* length 4)))
+ (colors (make-vector length)))
+ (let loop ((i 0))
+ (if (< i length)
+ (let ((offset (* i 4)))
+ (vector-set! colors i
+ (make-color (u8vector-ref bv offset)
+ (u8vector-ref bv (+ offset 1))
+ (u8vector-ref bv (+ offset 2))
+ (u8vector-ref bv (+ offset 3))))
+ (loop (1+ i)))
+ colors))))))
+
+
+;;;
+;;; Pixel Format
+;;;
+
+(define-wrapped-pointer-type <pixel-format>
+ pixel-format?
+ wrap-pixel-format unwrap-pixel-format
+ (lambda (pf port)
+ (format port "#<pixel-format name: ~s bpp: ~d>"
+ (pixel-format-name pf)
+ (pixel-format-bytes-per-pixel pf))))
+
+(define %pixel-format-types
+ (list uint32 ; format
+ '* ; palette
+ uint8 ; bits per pixel
+ uint8 ; bytes per pixel
+ uint32 ; red mask
+ uint32 ; green mask
+ uint32 ; blue mask
+ uint32)) ; alpha mask
+
+(define-syntax-rule (pixel-format-parse-match pf matchers ...)
+ (match (parse-c-struct (unwrap-pixel-format pf) %pixel-format-types)
+ matchers ...))
+
+(define (pixel-format-name pf)
+ "Return the symbolic name of the pixel format PF."
+ (pixel-format-parse-match pf
+ ((format _ _ _ _ _ _ _)
+ (cond
+ ((= format ffi:SDL_PIXELFORMAT_INDEX1LSB) 'index1lsb)
+ ((= format ffi:SDL_PIXELFORMAT_INDEX1MSB) 'index1msb)
+ ((= format ffi:SDL_PIXELFORMAT_INDEX4LSB) 'index4lsb)
+ ((= format ffi:SDL_PIXELFORMAT_INDEX4MSB) 'index4msb)
+ ((= format ffi:SDL_PIXELFORMAT_INDEX8) 'index8)
+ ((= format ffi:SDL_PIXELFORMAT_RGB332) 'rgb332)
+ ((= format ffi:SDL_PIXELFORMAT_RGB444) 'rgb444)
+ ((= format ffi:SDL_PIXELFORMAT_RGB555) 'rgb555)
+ ((= format ffi:SDL_PIXELFORMAT_BGR555) 'bgr555)
+ ((= format ffi:SDL_PIXELFORMAT_ARGB4444) 'argb4444)
+ ((= format ffi:SDL_PIXELFORMAT_RGBA4444) 'rgba4444)
+ ((= format ffi:SDL_PIXELFORMAT_ABGR4444) 'abgr4444)
+ ((= format ffi:SDL_PIXELFORMAT_BGRA4444) 'bgra4444)
+ ((= format ffi:SDL_PIXELFORMAT_ARGB1555) 'argb1555)
+ ((= format ffi:SDL_PIXELFORMAT_RGBA5551) 'rgba5551)
+ ((= format ffi:SDL_PIXELFORMAT_ABGR1555) 'abgr1555)
+ ((= format ffi:SDL_PIXELFORMAT_BGRA5551) 'bgra5551)
+ ((= format ffi:SDL_PIXELFORMAT_RGB565) 'rgb565)
+ ((= format ffi:SDL_PIXELFORMAT_BGR565) 'bgr565)
+ ((= format ffi:SDL_PIXELFORMAT_RGB24) 'rgb24)
+ ((= format ffi:SDL_PIXELFORMAT_BGR24) 'bgr24)
+ ((= format ffi:SDL_PIXELFORMAT_RGB888) 'rgb888)
+ ((= format ffi:SDL_PIXELFORMAT_RGBX8888) 'rgbx8888)
+ ((= format ffi:SDL_PIXELFORMAT_BGR888) 'bgr888)
+ ((= format ffi:SDL_PIXELFORMAT_BGRX8888) 'bgrx8888)
+ ((= format ffi:SDL_PIXELFORMAT_ARGB8888) 'argb8888)
+ ((= format ffi:SDL_PIXELFORMAT_RGBA8888) 'rgba8888)
+ ((= format ffi:SDL_PIXELFORMAT_ABGR8888) 'abgr8888)
+ ((= format ffi:SDL_PIXELFORMAT_BGRA8888) 'bgra8888)
+ ((= format ffi:SDL_PIXELFORMAT_ARGB2101010) 'argb2101010)
+ ((= format ffi:SDL_PIXELFORMAT_YV12) 'yv12)
+ ((= format ffi:SDL_PIXELFORMAT_IYUV) 'iyuv)
+ ((= format ffi:SDL_PIXELFORMAT_YUY2) 'yuy2)
+ ((= format ffi:SDL_PIXELFORMAT_UYVY) 'uyvy)
+ ((= format ffi:SDL_PIXELFORMAT_YVYU) 'yvyu)))))
+
+(define (pixel-format-palette pf)
+ "Return the palette for the pixel format PF."
+ (pixel-format-parse-match pf
+ ((_ palette _ _ _ _ _ _)
+ (if (null-pointer? palette)
+ #f
+ (wrap-palette palette)))))
+
+(define (pixel-format-bits-per-pixel pf)
+ "Return the number of bits per pixel for the pixel format PF."
+ (pixel-format-parse-match pf
+ ((_ _ bits _ _ _ _ _) bits)))
+
+(define (pixel-format-bytes-per-pixel pf)
+ "Return the number of bytes per pixel for the pixel format PF."
+ (pixel-format-parse-match pf
+ ((_ _ _ bytes _ _ _ _) bytes)))
+
+(define (pixel-format-red-mask pf)
+ "Return the bitmask for the red component of a pixel in the pixel
+format PF."
+ (pixel-format-parse-match pf
+ ((_ _ _ _ red-mask _ _ _) red-mask)))
+
+(define (pixel-format-green-mask pf)
+ "Return the bitmask for the green component of a pixel in the pixel
+format PF."
+ (pixel-format-parse-match pf
+ ((_ _ _ _ _ green-mask _ _) green-mask)))
+
+(define (pixel-format-blue-mask pf)
+ "Return the bitmask for the blue component of a pixel in the pixel
+format PF."
+ (pixel-format-parse-match pf
+ ((_ _ _ _ _ _ blue-mask _) blue-mask)))
+
+(define (pixel-format-alpha-mask pf)
+ "Return the bitmask for the alpha component of a pixel in the pixel
+format PF."
+ (pixel-format-parse-match pf
+ ((_ _ _ _ _ _ _ alpha-mask) alpha-mask)))
+
+
+;;;
+;;; Surface
+;;;
+
(define-wrapped-pointer-type <surface>
surface?
wrap-surface unwrap-surface
@@ -151,6 +342,12 @@ PROC."
((_ _ _ height pitch pixels)
(pointer->bytevector pixels (* height pitch)))))
+(define (surface-pixel-format surface)
+ "Return the pixel format for SURFACE."
+ (surface-parse-match surface
+ ((_ format _ _ _ _)
+ (wrap-pixel-format format))))
+
(define (symbol->sdl-pixel-format sym)
(match sym
('index1lsb ffi:SDL_PIXELFORMAT_INDEX1LSB)