/*
 * Copyright 2014 © Samsung Research America, Silicon Valley
 *
 * Use of this source code is governed by the 3-Clause BSD license
 * specified in the COPYING file included with this source code.
 */
// From http://www.atoker.com/blog/2008/09/06/skia-graphics-library-in-chrome-first-impressions/
#include <config.h>

#include <unistd.h>

#include <SkCanvas.h>
#include <SkPaint.h>
#include <SkGpuDevice.h>
#include <SkString.h>
#include <SkTemplates.h>
#include <SkTypeface.h>
#include <effects/SkGradientShader.h>
#include <SkDraw.h>
#include <effects/SkGradientShader.h>
#include <SkGraphics.h>

#include "caskbench.h"
#include "caskbench_context.h"
#include "skia-shapes.h"

// This test converts a text string to glyphs and displays it at various font sizes

static int max_dim;
static char rand_text_array[19][100];

void gen_skia_random(char *s, const int len) {
    static const char alphanum[] =
        "ABCD EFG HIJKL MNOPQ RSTUVW XYZ";
    for (int i = 0; i < len; ++i) {
        s[i] = alphanum[rnd() % (sizeof(alphanum) - 1)];
    }
    s[len] = 0;
}

int
sk_setup_text_glyphs(caskbench_context_t *ctx)
{
    max_dim = MIN(ctx->canvas_width, ctx->canvas_height)/2;
    ctx->skia_paint->setTextEncoding (SkPaint::kGlyphID_TextEncoding);
    return 1;
}

void
sk_teardown_text_glyphs(void)
{
}

static void getGlyphPositions(const SkPaint& paint, const uint16_t glyphs[],
                              int count, SkScalar x, SkScalar y, SkPoint pos[]) {
    SkASSERT(SkPaint::kGlyphID_TextEncoding == paint.getTextEncoding());

    SkAutoSTMalloc<128, SkScalar> widthStorage (count);
    SkScalar* widths = widthStorage.get();
    paint.getTextWidths (glyphs, count * sizeof(uint16_t), widths);

    for (int i = 0; i < count; ++i) {
        pos[i].set(x, y);
        x += widths[i];
    }
}

int
sk_test_text_glyphs(caskbench_context_t *ctx)
{
    double font_size = 18;
    int ypos = 15, xpos = 0;
    double font_factor = 0.5;
    SkPaint dummy_paint;
    ctx->skia_canvas->drawColor(SK_ColorBLACK);
    for (int i = 0; i < ctx->size; i++)
    {
        ctx->skia_paint->setTextSize (SkIntToScalar (font_size));
        skiaRandomizePaintColor(ctx);

        SkAutoSTMalloc<128, uint16_t> glyphStorage (font_size);
        uint16_t* glyphs = glyphStorage.get();

        char text[(int)font_size];
        gen_skia_random (text,font_size);

        // ctx->skia_paint gives wrong glyphCount and draws nothing, as text encoding is enabled. Using a dummy paint variable as of now.
        int glyphCount = dummy_paint.textToGlyphs (text, font_size, glyphs);
        ctx->skia_canvas->drawText (glyphs, glyphCount * sizeof(uint16_t), xpos,ypos, *(ctx->skia_paint));

        font_size = font_size+font_factor;
        ypos += (font_size/2);
        if (font_size >= 36)
            font_size = 36;
        if (ypos > ctx->canvas_height/2)
            font_factor = -0.5;
        if (font_size < 18)
            font_size = 18;
    }
    return 1;
}

/*
  Local Variables:
  mode:c++
  c-file-style:"stroustrup"
  c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
  indent-tabs-mode:nil
  fill-column:99
  End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :