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@
@
@    Copyright 2010 TheSeven
@
@
@    This file is part of emBIOS.
@
@    emBIOS 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, either version 2 of the
@    License, or (at your option) any later version.
@
@    emBIOS 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 emBIOS.  If not, see <http://www.gnu.org/licenses/>.
@
@


#define ASM_FILE
#include "global.h"


.section .icode.get_font_width, "ax", %progbits
.align 2
.global get_font_width
.type get_font_width, %function
get_font_width:
        mov     r0, #6
        mov     pc, lr
.size get_font_width, .-get_font_width


.section .icode.get_font_height, "ax", %progbits
.align 2
.global get_font_height
.type get_font_height, %function
get_font_height:
        mov     r0, #8
        mov     pc, lr
.size get_font_height, .-get_font_height


.section .icode.rendertext, "ax", %progbits
.align 2
.global rendertext
.type rendertext, %function
rendertext:
        stmfd   sp!, {r0-r2,r4,r5,lr}
        ldr     r4, [sp,#0x18]
        str     r4, [sp,#-4]!
        mov     r4, r3
        mov     r5, #6 * LCD_BYTESPERPIXEL
rendertext_loop:
        ldrb    r3, [r4], #1
        cmp     r3, #0
        beq     rendertext_done
        bl      renderchar
        ldmed   sp, {r0-r2}
        add     r0, r0, r5
        str     r0, [sp,#4]
        b       rendertext_loop
rendertext_done:
        ldmfd   sp!, {r0-r5,pc}
.size rendertext, .-rendertext


.section .icode.renderfillrect, "ax", %progbits
.align 2
.global renderfillrect
.type renderfillrect, %function
renderfillrect:
        ldr     r12, [sp,#8]
        mla     r1, r12, r2, r1
#if (LCD_BYTESPERPIXEL == 1)
        add     r0, r0, r1
#elif (LCD_BYTESPERPIXEL == 2)
        add     r0, r0, r1,lsl#1
#elif (LCD_BYTESPERPIXEL == 4)
        add     r0, r0, r1,lsl#2
#else
#error Unknown number of bytes per pixel!
#endif
        ldmfd   sp, {r1,r2}
renderfillrect_y:
        cmp     r1, #0
        cmpne   r3, #0
        moveq   pc, lr
        sub     r1, r1, #1
        mov     r12, r3
renderfillrect_x:
#if (LCD_BYTESPERPIXEL == 1)
        strb    r2, [r0], #1
#elif (LCD_BYTESPERPIXEL == 2)
        strh    r2, [r0], #2
#elif (LCD_BYTESPERPIXEL == 4)
        str     r2, [r0], #4
#else
#error Unknown number of bytes per pixel!
#endif
        subs    r12, r12, #1
        bne     renderfillrect_x
        ldr     r12, [sp,#8]
        sub     r12, r12, r3
#if (LCD_BYTESPERPIXEL == 1)
        add     r0, r0, r12
#elif (LCD_BYTESPERPIXEL == 2)
        add     r0, r0, r12,lsl#1
#elif (LCD_BYTESPERPIXEL == 4)
        add     r0, r0, r12,lsl#2
#else
#error Unknown number of bytes per pixel!
#endif
        b       renderfillrect_y
.size renderfillrect, .-renderfillrect


#if (LCD_BYTESPERPIXEL == 2)
.section .icode.renderbmp, "ax", %progbits
.align 2
.global renderbmp
.type renderbmp, %function
renderbmp:
        mov     r2, r2,lsl#1
        ldrh    r3, [r1]
        sub     r3, r3, #0x4d00
        subs    r3, r3, #0x42
        movne   pc, lr
        stmfd   sp!, {r4,lr}
        ldrh    r4, [r1,#18]
        ldrh    r12, [r1,#20]
        orr     r4, r4, r12,lsl#16
        ldrh    r3, [r1,#22]
        ldrh    r12, [r1,#24]
        orr     r3, r3, r12,lsl#16
        ldrh    lr, [r1,#10]
        ldrh    r12, [r1,#12]
        orr     lr, lr, r12,lsl#16
        add     r1, r1, lr
        mul     lr, r2, r3
        add     r0, r0, lr
renderbmp_row:
        mov     r12, r4
        sub     r0, r0, r2
renderbmp_pixel:
#ifdef LCD_BIGENDIAN
        ldrb    lr, [r1,#1]
        strb    lr, [r0], #1
        ldrb    lr, [r1], #2
        strb    lr, [r0], #1
#else
        ldrh    lr, [r1], #2
        strh    lr, [r0], #2
#endif
        subs    r12, r12, #1
        bne     renderbmp_pixel
        tst     r4, #1
        addne   r1, r1, #2
        sub     r0, r0, r4,lsl#1
        subs    r3, r3, #1
        bne     renderbmp_row
        ldmfd   sp!, {r4,pc}
.size renderbmp, .-renderbmp


.section .icode.renderchar, "ax", %progbits
.align 2
.global renderchar
.type renderchar, %function
renderchar:
        stmfd   sp!, {r4-r7,lr}
        ldr     r7, [sp,#0x14]
        cmn     r2, #1
        beq     renderchar_nobg
        mov     r6, r0
        mov     r4, #8
        mov     lr, r2,lsr#16
        sub     lr, lr, #0xff00
        subs    lr, lr, #0xff
        bne     renderchar_opaquerow
        mov     r12, r2,lsl#16
        mov     r12, r12,lsr#16
renderchar_blendrow:
        mov     r5, #6
renderchar_blendcol:
        ldrh    lr, [r6]
        movs    lr, lr,lsr#1
#ifdef LCD_BIGENDIAN
        orrcs   lr, lr, #0x10000
        bic     lr, lr, #0x1000
        bic     lr, lr, #0x84
#else
        bic     lr, lr, #0x410
#endif
        add     lr, lr, r12
        strh    lr, [r6], #2
        subs    r5, r5, #1
        bne     renderchar_blendcol
        add     r6, r6, r7,lsl#1
        sub     r6, r6, #12
        subs    r4, r4, #1
        bne     renderchar_blendrow
        b       renderchar_nobg
renderchar_opaquerow:
        mov     r5, #6
renderchar_opaquecol:
        strh    r2, [r6], #2
        subs    r5, r5, #1
        bne     renderchar_opaquecol
        add     r6, r6, r7,lsl#1
        sub     r6, r6, #12
        subs    r4, r4, #1
        bne     renderchar_opaquerow
renderchar_nobg:
        adr     r5, renderchar_font
        sub     r3, r3, #0x20
        cmp     r3, #0x5f
        addcc   r5, r3,lsl#2
        addcc   r5, r3
        mov     r3, #5
renderchar_col:
        mov     r6, r0
        ldrb    r4, [r5], #1
renderchar_row:
        tst     r4, #1
        strneh  r1, [r6]
        add     r6, r6, r7,lsl#1
        movs    r4, r4,lsr#1
        bne     renderchar_row
        add     r0, r0, #2
        subs    r3, r3, #1
        bne     renderchar_col
        add     r0, r0, #2
        ldmfd   sp!, {r4-r7,pc}

renderchar_font:
        .byte 0, 0, 0, 0, 0
        .byte 0, 0, 95, 0, 0
        .byte 0, 7, 0, 7, 0
        .byte 20, 127, 20, 127, 20
        .byte 36, 42, 127, 42, 18
        .byte 35, 19, 8, 100, 98
        .byte 54, 73, 85, 34, 80
        .byte 5, 3, 0, 0, 0
        .byte 28, 34, 65, 0, 0
        .byte 0, 0, 65, 34, 28
        .byte 20, 8, 62, 8, 20
        .byte 8, 8, 62, 8, 8
        .byte 0, -96, 96, 0, 0
        .byte 8, 8, 8, 8, 8
        .byte 0, 96, 96, 0, 0
        .byte 32, 16, 8, 4, 2
        .byte 62, 81, 73, 69, 62
        .byte 0, 66, 127, 64, 0
        .byte 66, 97, 81, 73, 70
        .byte 33, 65, 69, 75, 49
        .byte 24, 20, 18, 127, 16
        .byte 39, 69, 69, 69, 57
        .byte 60, 74, 73, 73, 48
        .byte 1, 113, 9, 5, 3
        .byte 54, 73, 73, 73, 54
        .byte 6, 73, 73, 41, 30
        .byte 0, 54, 54, 0, 0
        .byte 0, 86, 54, 0, 0
        .byte 8, 20, 34, 65, 0
        .byte 20, 20, 20, 20, 20
        .byte 0, 65, 34, 20, 8
        .byte 2, 1, 81, 9, 6
        .byte 50, 73, 121, 65, 62
        .byte 124, 18, 17, 18, 124
        .byte 127, 73, 73, 73, 62
        .byte 62, 65, 65, 65, 34
        .byte 127, 65, 65, 34, 28
        .byte 127, 73, 73, 73, 65
        .byte 127, 9, 9, 9, 1
        .byte 62, 65, 73, 73, 58
        .byte 127, 8, 8, 8, 127
        .byte 0, 65, 127, 65, 0
        .byte 32, 64, 65, 63, 1
        .byte 127, 8, 20, 34, 65
        .byte 127, 64, 64, 64, 64
        .byte 127, 2, 12, 2, 127
        .byte 127, 4, 8, 16, 127
        .byte 62, 65, 65, 65, 62
        .byte 127, 9, 9, 9, 6
        .byte 62, 65, 81, 33, 94
        .byte 127, 9, 25, 41, 70
        .byte 38, 73, 73, 73, 50
        .byte 1, 1, 127, 1, 1
        .byte 63, 64, 64, 64, 63
        .byte 31, 32, 64, 32, 31
        .byte 127, 32, 24, 32, 127
        .byte 99, 20, 8, 20, 99
        .byte 3, 4, 120, 4, 3
        .byte 97, 81, 73, 69, 67
        .byte 0, 127, 65, 65, 0
        .byte 2, 4, 8, 16, 32
        .byte 0, 65, 65, 127, 0
        .byte 4, 2, 1, 2, 4
        .byte 64, 64, 64, 64, 64
        .byte 1, 2, 4, 0, 0
        .byte 32, 84, 84, 84, 120
        .byte 127, 68, 68, 68, 56
        .byte 56, 68, 68, 68, 40
        .byte 56, 68, 68, 68, 127
        .byte 56, 84, 84, 84, 24
        .byte 8, 126, 9, 1, 2
        .byte 8, 84, 84, 84, 60
        .byte 127, 4, 4, 4, 120
        .byte 0, 68, 125, 64, 0
        .byte 32, 64, 64, 61, 0
        .byte 127, 16, 40, 68, 0
        .byte 0, 65, 127, 64, 0
        .byte 124, 4, 24, 4, 120
        .byte 124, 8, 4, 4, 120
        .byte 56, 68, 68, 68, 56
        .byte 124, 20, 20, 20, 24
        .byte 8, 20, 20, 20, 124
        .byte 124, 8, 4, 4, 8
        .byte 72, 84, 84, 84, 32
        .byte 4, 63, 68, 64, 32
        .byte 60, 64, 64, 32, 124
        .byte 28, 32, 64, 32, 28
        .byte 60, 64, 56, 64, 60
        .byte 68, 40, 16, 40, 68
        .byte 12, 80, 80, 80, 60
        .byte 68, 100, 84, 76, 68
        .byte 0, 8, 54, 65, 0
        .byte 0, 0, 119, 0, 0
        .byte 0, 65, 54, 8, 0
        .byte 2, 1, 2, 4, 2
.align 2
.size renderchar, .-renderchar
#else
#error Unknown number of bytes per pixel!
#endif